Group Members

Research Publications Lab Facilities
Computation Platform
Collaborators
Internal Links
News
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Hasan: A speckle of dust (Princeton homepage feature, Summer Reads)

(Q. Epistemology) "Experiments are the only means of (real) knowledge at our disposal. The rest is poetry, imagination" (Max Planck)
"To see a world in a grain of sand, And a heaven in a wild flower, Hold infinity in the palm of your hand,
And eternity in an hour" (W. Blake)
News/Talks: "To see the world of topology in a grain of dirty matter..." :

Theoretical predictions of "topological quantum matter" at LTQMAS/Princeton.
How X-rays Pushed Topo. Matter Research Over the Top (Berkeley Lab News)
Work at Berkeley Lab helped to spawn a revolution in materials research
Novel quantum-matter with topological twists ( Moore foundation News 2019 )
Prediction and Discovery of Novel "Topological Quantum Matter" ( Princeton University Homepage News 2019 )
Topological Magnets ( American Physical Society invited talk 2019 )
Topological Insulator to Weyl Fermions and Beyond.. ( Colloquium 2019 )
Our theoretical prediction of Magnetic Weyl CeAlGe inspired expts at MIT (Science (2019))

Engineering topological behavior opens new frontier in quantum materials ( Moore foundation News )
Massless particle named top-10 breakthrough ( Moore foundation News )
Congratulations to Sonia Zhang on winning the Kusaka Memorial Prize 2019 (Dept. of Physics, Princeton)
Her Vector-Field STM/STS work, published by NATURE was featured on PhysicsWorld homepage in 13-Sept'18.

Congratulations to Ilya Belopolski on winning the Kusaka Memorial Prize 2017 (Dept. of Physics, Princeton)
His contribution to Weyl metal discovery , published by SCIENCE was also featured on PhysicsWorld homepage. Ilya is also a co-inventor of the patent on Weyl discovery(see, Weyl returns)


"Topo. Insulators" RMP (with 11,000+ citations) featured under "90 years of RMP" celebration at APS (2019)
About 2/3 of the "Topo. Insulators" RMP (2010) is about our experimental works covered in 6 original papers (KITP-2007, Nature'08, Science'09, NaturePhysics'09, PRL'09, Nature'09a, and Nature'09b).
Earliest of the results reported in 2007 (KITP-2007 leading to Nature 2008).

All-time most-cited RMPs: Complex Networks( #1), Topological Insulators( #2), Graphene( #3)

An upside-down (Kagome) Magnet ( News at Nature Physics 2019 )
"Topological Physicists" at ( PhysicsWorld 2019; This is mostly about our 2017-18 theory work on chiral crystals: "Unconventional Chiral Fermions and Large Topological Fermi Arcs in RhSi" (PRL 2017) and later theory papers (Nature Mat)).
Theoretical prediction of "4-unit Quantized circular photogalvanic effect" also appears in the same paper (PRL).
Topological Chiral Crystals ( Nature Research 2019 )
Prediction and Discovery of "Topological Chiral Crystals" ( Princeton News, Nature 2019 )

Topological band theory pioneer: David Thouless (1934-2019)
“It's about how ordinary matter can behave in extraordinary ways." (Hasan on Thouless work at Science News)
Group members, students met with David during his visit for Anderson90. David expressed interest in our work. Some memories of David is here at PWA90

How X-rays Pushed Topological Matter Research Over the Top (Berkeley Lab News)
The Strange Topology That Is Reshaping Physics (Scientific American)
The Best Topological Conductors Yet: Spiraling Crystal Is the Key to Exotic Discovery (Berkeley Lab News)
Scientists discover a 'tuneable' novel quantum state of matter (Princeton University News)
Exotic spin textures.. (Topological Insulators) ( "Search & Discovery" PHYSICS TODAY )
Topological Insulators ( Stanford University/SLAC/Photon-Science )
Discovery of Weyl Fermion Semimetals ( PhysicsWorld )
Topological Insulators ( feature in PHYSICS TODAY )
Topo. Insulator to Weyl fermion ( Nature News )
Weyl fermion discovery ( ALS @ Berkeley Lab)
Weyl Semimetal discovery methods US Patent App. 10/214,797
Weyl Semimetal discovery methods US Patent App. 15/352,279 Approved
Weyl Semimetals, Fermi Arcs and Chiral Anomalies ( Cover Story in Nature Materials )

Chiral Majorana fermions in superconducting topological insulators ( Europhys Letters, Editor's Highlight)
Discovery of Weyl Fermion Semimetals and Topological Fermi Arc States ( (review))
Topological Phase Transition and Texture Inversion ( Science )
Correlated Kagome Magnet ( Nature Physics )
A quantum magnet with a topoogical twist ( Research at Prnceton )
Nematic (strongly correlated) Kagome Magnet ( Nature )
Discovery of Weyl Semimetals ( Berkeley Lab )
"Welcome to the Weird Mathematical World of Topology" (DISCOVER magazine)
Prediction of Quantized circular photogalvanic effect in RhSi chiral conductors ( Phys. Rev. Lett. )

Five present & past group members (Xia, Lin, Wray, Xu and Hasan) listed in Highly-Cited-Researchers 2018 (Top-1%)
Each member had several papers published with us at Princeton that are now cited 1,000+ times each and total average citations 10,000+ given (to each member) to our publications by colleagues world-wide (2018).


PhysicsWorld (2018): "Physicists find new ‘control knob’ for the quantum topological world" (Nature 2018)

Our theoretical prediction of Kramers-Weyl fermions highlighed by Nature Materials News & Views 2018
"By considering the topology of chiral crystals, a new type of massless fermion, connected with giant arc-like surface states, are predicted. Such Kramers–Weyl fermions should manifest themselves in a wide variety of chiral materials." News at Nature Materials 2018
(Theoretical Prediction of) Chiral fermions and large topological Fermi arcs in RhSi family
Topological Chiral Crystals (2017)

"Kramers theorem-enforced Weyl fermions: Theory and Materials Predictions" (2016)

"New emergent phenomena in topological matter" (Moore Symposium talk 2018)

Weyl fermions in 2018: "Wily Weyls" (PhysicsWorld 2018)
Nature's Scientific Reports features our work on topological "Nexus Fermion" 2018
NSF New Frontiers Workshop Talk (National Science Foundation):
"Theoretical & experimental discovery of Weyl, topo. nodal line & chiral materials"


Moore Symposium Talk (Moore Foundation):
"Theoretical & experimental discovery of Weyl, topo. nodal line & chiral materials"


DOE/Basic Energy Sciences Workshop Talk (U.S.DOE):
"Theoretical & experimental discovery of Weyl, topo. nodal line & chiral materials"


"New topological states of matter: platform for emergent Dirac-Majorana-Weyl" (Colloquium at CalTech)

DISCOVER magazine: Topological Insulators to Weyl, Majorana fermions and beyond (2018)

Discovery of Lorentz-violating topological Weyl fermions in LaAlGe (Science Advances)
"Chiral Majorana fermion modes on the surface of superconducting topological insulators" (EPL 2018)

"New topological states of matter: platform for emergent Dirac-Majorana-Weyl" UC Berkeley (colloquium)

A vast majority of our experimental works are based on our own theoretical predictions of materials (link)
PhysicsWorld: Weyl fermion at APS Meeting
"Theoretical and Experimental Discovery of Weyl, Nodal-line and Chiral Anomaly Materials" (Gordon Moore Symposium)

Guoqing Chang joins our group Welcome Guoqing!
Ilya Belopolski wins Kusaka Memomrial Prize in Physics (Princeton Univ), Congratulations Ilya!
Suyang Xu named in the global Highly-Cited-List (2017); Congratulations Suyang !
Nasser Alidoust joins Rigetti Computing (Berkeley), Goodluck Quantum Computing Nasser!
David Hsieh (PhD'09) (faculty at CalTech) named PECASE award winner (2017); Congratulations Dave !

Prof. Hasan serves on the national level U.S. DOE roundtable panel on "Frontiers of XFEL Ultrafast Science" (2018)
"Engineering topological states opens new frontier in quantum-materials" News at Moore Foundation (2017)

Nature Research features two of our papers (magnetic-Weyl and Nexus Fermions) in connection to APS-Physics MM (2018)
Invited Review Article (STM/STS) on Quasiparticle Interference in Weyl Semimetals (2018)

Room-temperature magnetic-Weyl fermion and nodal line semimetal states in half-metallic Heusler (2017)

2017 Sir Nevill Mott Lecture in Physics

News at NATURE (Homepage news, July 2017) ".. strange topology that is reshaping physics"

Kavli KITP program on "Topological Insulators and Superconductors" (Collection of Talks)

Inst. for Advanced Study (IAS, Princeton) School on Topological Matter Useful Reading List

FOCUS issue on "Topological Semimetals" by Nature Materials (Collection of Articles)

International Conference (ICTP) on Weyl Fermions in Materials (Italy)

Prof. Hasan's talk at Physics-Next (APS-Physics/PRL) "Quantum Fields to Condensed Matter"

Discovery of Weyl fermion and topological nodal-line fermions as emergent excitations in topological materials (Joint Quantum Inst)

Prof. Hasan's interview with PhysicsWorld Multimedia (UK)

Weyl Semimetals, Fermi Arcs and Chiral Anomalies Nature Materials (2017)

"Discovery of New Topological Phases of Matter" (Lawrence Berkeley Lab, 2017)

American Physical Society (APS-Physics) Meeting : Weyl Topological Semimetals: Theory and Experiment

"New topological states of matter: platform for emergent Dirac-Majorana-Weyl" CalTech (colloquium)

Some updates:
Guang Bian joins the faculty at Univ. of Missouri Goodluck Guang!
Hao Zheng joins the faculty at Shang-hai Univ. Goodluck Hao!
Madhab Neupane joins the faculty at Univ. of Florida, Goodluck Madhab!
David Hsieh joins the tenure-line faculty at CalTech Congratulations Dave !

"Topological Insulators" and "Weyl Semimetals" highlighted by NATURE's Insight on Quantum Materials
along with superconductivity and spin liquids.

Cover page: Nature Materials issue highlights our topological materials works

Faculty Honor (Princeton News) Top Ten

New Topological Materials: Berkeley Lab News

Princeton theory center workshop on Weyl Fermions in Topological Semimetals

Beyond particle Physics (Nature Materials 2017) :

(Theoretical Prediction of ) Drumhead surface states and topological nodal-line fermions in TlTaSe2

Princeton University named Professor Hasan to an endowed chair professorship:
Eugene Higgins Professor of Physics effective, 2017.

(Endowed Professorship) News at Princeton

Miller Professorship Lecture by Prof. Hasan at Miller Institute (UC-Berkeley)

Quantum Materials: Where many paths meet (MRS News 2017) :

(Theoretical Prediction) Nexus Fermions in spin-orbit materials (2017)

Moore foundation Symposium talk : "Theoretical and experimental discovery of Weyl fermion, topological nodal-line fermion and Chiral anomaly materials and the new physics frontier"

(Theoretical prediction) "New type of Weyl semimetal with quadratic double Weyl fermions"

(Theoretical Prediction) Unconventional chiral fermions and large topological Fermi arcs in RhSi (2017)

Princeton theory center (PCTS) talk : "Theoretical and experimental discovery of Weyl fermion, topological nodal-line fermion and Chiral anomaly materials and the new physics frontier"

(Theoretical Prediction) "Magnetic and noncentrosymmetric Weyl fermion semimetals in the RAlX family of compounds" (2016)

"Theoretical and experimental discovery of Weyl fermion, topological nodal-line fermion and Chiral anomaly materials and the new physics frontier" (Los Alamos Lab 2017)

"Theoretical and experimental discovery of New Topological States of Matter (Topo. Semimetals)" (APS-Physics Editorial Office Colloq. 2017)

(Theoretical Prediction) "Drumhead Surface States and Topological Nodal-Line Fermions in TlTaSe2"

Opening Talk at Max-Planck-Institut (Germany) "New Forms of Matter"

Keynote Talk at Hubbard theory consortium summer school (London) "Topo.Order in Real Materials"

Keynote Talk at NORDITA (2017) "Frontiers of Topological Quantum Matter"

APS-Physics March Meeting (Discovery of Weyl fermions): PhysicsWorld (2016)

"Theoretical and experimental discovery of Weyl fermion, topological nodal-line fermion and Chiral anomaly materials and the new physics frontier" (Rutgers 2016)

Science Talk at Workshop on Topological States of Matter at Frieburg (Germany)

Prof. Hasan's opening Keynote at "New Trends in Topological Insulators" (Germany)

Keynote Lecture at IPS Conference "Topological Insulators and Superconductors"

(Theoretical Prediction) Topological Nodal-Line Fermions in Spin-Orbit Metal PbTaSe2

"Discovery (theoretical and experimental) of Lorentz-invariant and Lorentz-violating emergent Weyl fermions in topological materials (TaAs class & LaAlGe class)"

MIT Chez Pierre Seminar in Condensed Matter Physics:
Lecture Link

"Observation of a New Class of Topological States of Quantum Matter"
Physics Colloquium at Harvard University

Link


"Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface"

Lecture Link

Inst. for Adv. Studies Distinguished Lecture (HKUST) "New Topological Phases of Matter"

U.S. DOE User Facility News: "How X-rays Pushed Topological Matter Research Over the Top" (2017)
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News (May-July, 2017):

Scientific American article on Topology Reshaping Physics (based on NATURE artcle)

Berkeley Lab News:

"Work at Berkeley Lab's Adv.Light Source helped to spawn a revolution in materials research"

Paper on Artificial Topological Matter is now published

"A novel artificial condensed matter lattice and a new platform for 1-D topological phases "
Ilya Belopolski et.al., Science Advances (2017)

Review (invited) article is now published
"Discovery of Weyl Fermion Semimetals and Topological Fermi Arc States"
M. Z. Hasan, S.-Y. Xu, I. Belopolski, S.-M. Huang
Ann. Review Cond. Mat. Phys 8, 289-309 (2017)
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Theoretical Prediction of Topological Hopf-link semimetals (2017)

"Topological Hopf and Chain Link Semimetal States and Their Application to Co2MnGa"
Guoqing Chang, Su-Yang Xu, Xiaoting Zhou, Shin-Ming Huang, Bahadur Singh, Baokai Wang, Ilya Belopolski, Jiaxin Yin, Songtian Zhang, Arun Bansil, Hsin Lin, and M. Zahid Hasan

Phys. Rev. Lett. 119, 156401 (2017)

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News :

Science News (2017) "Quasiparticle known as type-II Weyl fermion violates Lorentz symmetry"

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Talk:
"Discovery (theoretical and experimental) of Lorentz-invariant and Lorentz-violating emergent Weyl fermions in topological materials (TaAs class & LaAlGe class)"

MIT Chez Pierre Seminar in Condensed Matter Physics

Lecture Link
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Talk:
Canadian Institute For Advanced Research (CIFAR)
Summer School Lecture

"New Topological States of Quantum Matter: Dirac, Weyl/TNL & Majorana Platforms"

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Talk:
KITP Program on Topological Insulators and Topological Superconductors

KITP Link

Lecture PPT Link
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Talk:
"Topological Surface States: Discovery and Resecent Results"
Physics Colloquium at Cornell University

Link

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Talk:
"Discovery of quantum Hall-like effects without magnetic fields in 3D"
Physics Colloquium at Columbia University

Link

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Talk:
Max-Planck Institute for the Physics of Complex Systems Talk
"New Forms of Matter: Weyl semimetals, Topological nodal-line metals and related superconductors"

Talk Link

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American Physical Society (APS) Talk

"Discovery of Weyl fermion semimetal and topological Fermi arc quasiparticles in TaAs, NbAs, NbP, TaP and related materials"

APS link
, Video link, APS Group talks

PhysicsWorld (2016)

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  List of topics/talks
 
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Education/Science Outreach : PDF
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New Topological Phases of Matter: Platform for emergent Dirac, Majorana & Weyl fermions (2016)
Colloquium at California Inst. of Technology (2016)
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"Genie out of the bottle": Topological Insulators (September, 2016):
Proceedings of National Academy of Sciences of the USA
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PhysicsWorld multimedia interview: "What is a Topological Metal? (2016)
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Prof. Hasan awarded a Visiting Miller Professorship by the Miller Institute for Basic Research at
the University of California at Berkeley
Berkeley Link

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Edward Witten's recent review on Topological Phases (2016)
Rev. Mod. Phys. 88, 35001 (2016) ======================================================================
Congratulations! Dr. Nasser Alidoust
"Discovery of Novel Dirac and Weyl Fermion Materials" PhD Thesis(Princeton)

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Congratulations! Dr. Suyang Xu
"Discoveries of New Topological States of Matter Beyond Topo.Insulators" PhD Thesis(Princeton)


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Experimental discovery of the first 3D topological insulators recognized by APS in 2013

How to discover topological insulator materials ..here
A recipe for discovering new topological insulators can be found here
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PhysicsWorld (2016)

Weyl semimetals, Fermi arcs and chiral anomaly
Invited Commentary at NATURE MATERIALS (cover story), November 2016
DS
 
 
" Physicists have discovered a new topological phase of matter, the Weyl semimetal, whose surface features a non-closed Fermi surface whereas the low-energy quasiparticles in the bulk emerge as Weyl fermions. A brief review of these developments and perspectives on the next steps forward are presented."
Nature Materials 15, 1140-1144 (2016)
 
 
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Bose seminar (public lecture) at the S.N.Bose Center for Advanced Study & Research on physical sciences
Topic: "New Topo. States of Matter (Topo. Fermions and Bose-Einstein condensation of Helical Cooper pairs)"

Lecture Link
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Some examples of our theoretical predictions can be found here

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"Theoretical & experimental discovery of Weyl, topo. nodal line fermion & chiral anomaly materials"
Keynote talk at Hubbard Theory Consortium center, London Summer School of Condensed Matter Physics 2016, London University, Royal Holloway College, London (UK)

Link
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Focus Issue on Topological Semimetals
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Old/Early (1972-88) topological concepts in condensed matter theory
Topology of Kosterlitz-Thouless & Haldane
Princeton media link
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Weyl semimetals discovered (Xu, Belopolski et.al., at LBNL)

Advanced Light Source; Lawrence Berkeley National Labortaory
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Princeton Physics News:
"Ilya Belopolski won the Harold W. Dodds Fellowship for his work on
Weyl fermion semimetals and quantum anomalies"

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2016 Web of Science Highly Cited Researchers Thomson Reuters
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2015 Thomson Reuters Most Influential Scientific Minds Thomson Reuters
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PhysicsWorld (U.K.) homepage (August, 2016)
Future applications of Topological Insulators
PhysicsWorld multimedia interview (100 Second Science Series)


Bulk Insulating (Intrinsic) Topological Insulators
Bulk Insulating Topo. Insulator: Gigantic surface life-time of an intrinsic topological insulator revealed via time-resolved ARPES M. Neupane, S.-Y. Xu, Y. Ishida et al.; Phys. Rev. Lett. 115, 116801 (2015) Phys.Rev.Lett. Link
Transport + ARPES Demonstration of a Fully Bulk Insulating (Intrinsic) Topo. Insulator; Y. Xu, I. Miotkowski, C. Liu et.al.; Nature Physics 10, 956 (2014). Nature Physics Link
ARPES Demonstration of helical (topological) Cooper pairing in a proximitized TI/superconductor; S. Xu, N. Alidoust, I.Belopolski et al., Nat. Phys. 10, 943 (2014). Nature Physics Link

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Weyl fermions discovered

Lawrence Berkeley National Labortaory (U.S. DOE) Sci-HiLight link
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Superconducting Topological Materials

News at Lawrence Berkeley National Labortaory (U.S. DOE) link
ARPES Demonstration of helical (topological) Cooper pairing in a proximitized TI/superconductor; S. Xu, N. Alidoust, I.Belopolski et al., Nat. Phys. 10, 943 (2014). Nature Physics Link

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Topological Insulator Spin-Texture Demonstrated

Stanford Synchrotron Laboratory, SLAC National Lab (U.S. DOE) link
Link
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"Theoretical & experimental discovery of Weyl fermion, topo. nodal-line fermion (new fermions) & chiral anomaly materials"
Betty and Gordon Moore Foundation Symposium, EPIQS Meeting 2016, California

Link
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"Theoretical & experimental discovery of Weyl fermion, topo. nodal line & chiral anomaly materials"
Lecture at Rutgers University
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"Theoretical & experimental discovery of Weyl fermion, topo. nodal line & chiral anomaly materials"
NSF New Frontiers of Condensed Matter Physics Meeting
(U.S. National Science Foundation)

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"New Forms of Matter: Weyl Fermions, Topo. nodal line fermion & new Majorana platforms"
Keynote Lecture, Rutherford - Appleton Laboratory, UK

Link
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Institute for Advanced Study Distinguished Lecture at HKUST
New Topological States of Matter (2015)


IAS Link
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DS


World's Most Influential Scientific Minds List (2016)
Highly-Cited Researcher (top 1%): Clarivet-Analytics/Thomson-Reuters (2016)
 
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DS


Moore Symposium Lecture (2014)
 
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  DS

Topologically protected Single Dirac Cone (Spin-Textured)
Nature Physics N&V

 
 


DS
 
  DS

Tilted Weyl cone in topological materials bears an analogy to the lightcone bending near blackholes (simulated Lorentz violation in quantum matter).
Science Advances (2017)


 
 
  "Discovery of Weyl Fermions, Topological Fermi Arcs and Topological Nodal-Line States of Matter"
(Key Developments in Physics: 2Physics, 2015)

 
 
DS
 
  Discovery of Weyl fermion named a 'breakthrough of the year' by Physics World
PhysicsWorld News: "Weyl fermions are spotted at long last"
News at Lawrence Berkeley National Laboratory (LBNL),

Physics Highlights of the Year 2015 (Physics - American Physical Society)
 
 
DS


Highly-Cited Researcher (top 1%): Thomson-Reuters (2014, 2015)
World's Most Influential Scientists List : Thomson-Reuters (2014, 2015)
Journal publications in 2003-2013
News link
 
 


DS


"Discovery of single-Dirac-cone Topological Insulators"
ALS-SPECTRUM
Lawrence Berkeley National Laboratory
 
 


DS


"Helical Cooper Pairing in Superconducting Topological Insulators"
News link

Nature Physics

 
 


DS


New funding for quantum systems
News link


 
 
MOORE

Lawrence Berkeley National Laboratory News


 
 
MOORE

SLAC National Laboratory News

 
 
NbSe2
 
 
EPiQS Program award details

MOORE


To expand research in advanced quantum materials, the Moore Foundation (Intel founder Moore) launched a large initiative called Emergent Phenomena in Quantum Systems (EPiQS). The Moore Experimental Investigator in Quantum Materials Awards, recently identified 19 scientists who will receive funding support for five years. Our group has own one of the Moore Experimental Investigator Awards (2014-2019).
 
 
Moore Investigator Award Link

 
 


DS


Search & Discovery News: Topological Insulators
"Exotic spin textures show up in diverse materials"


 
 


DOE


U.S. DOE Physicists at work: World Year of Physics (2005)

Hasan's experimental photoemission (Annus Mirabilis 1905 Einstein paper on
photoelectric/photoemission effect) work featured in DOE's office of science.


 
 
DOE


"New spectroscopy takes aim at an unsolved electronic mystery"
Stanford University News, June 14, 2000


 
 
Sloan


"Alfred P. Sloan Research Fellowships"
Fellowship Link


 
 
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M. Zahid Hasan named Fellow of the American Physical Society

APS citation: "for the experimental discovery of three dimensional topological insulators".

News link
 
 
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M.Shirley award for outstanding scientific achievement awarded to M. Zahid Hasan

Citation: "for the discovery of topological order in the solid state and quantum Hall-like behavior without magnetic fields (bulk topological insulators)".

Award link
 
 
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Science (Perspective/News):

"How do you want that insulator?" (topological insulators)


 
 
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News:

"Quantum Twist: Electrons Mimic Presence of Magnetic Field" (topological insulators)


 
 
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Science News:

"Fast Electrons Tie Quantum Knots" (topological insulators)


 
 
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