**(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 actually see the world of topology in a grain of dirty matter..." :

And eternity in an hour" (W. Blake)

Novel quantum-matter with topological twists (

**Moore foundation News 2019**)

Topological Magnets (

**APS invited talk 2019**)

"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)**

Topological Insulator to Weyl Fermions and Beyond.. (

**Colloquium 2019**)

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:

**(1934-2019)**

__David Thouless__“It's about how ordinary matter can behave in extraordinary ways." (On Thouless et.al work,

**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**

Topological Chiral Crystals (2017)

__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**)

__joins our group__

**Guoqing Chang**__!__

*Welcome***Guoqing**__wins Kusaka Memomrial Prize in Physics (Princeton Univ),__

**Ilya Belopolski**__!__

*Congratulations***Ilya**__named in the global Highly-Cited-List (2017);__

**Suyang Xu**__!__

*Congratulations***Suyang**__joins Rigetti Computing (Berkeley),__

**Nasser Alidoust**__!__

*Goodluck Quantum Computing***Nasser**__named PECASE award winner (2017);__

**David Hsieh (PhD'09) (faculty at CalTech)**__!__

*Congratulations***Dave**Prof. Hasan serves on the national level U.S. DOE roundtable panel on

**(2018)**

__"Frontiers of XFEL Ultrafast Science"__"

**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 PhysicsNews 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

__(APS-Physics/PRL) "Quantum Fields to Condensed Matter"__

**Physics-Next**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:

__joins the faculty at Univ. of Missouri__

**Guang Bian**__!__

*Goodluck***Guang**__joins the faculty at Shang-hai Univ.__

**Hao Zheng**__!__

*Goodluck***Hao**__joins the faculty at Univ. of Florida,__

**Madhab Neupane**__!__

*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)**

====================================================================================

News (May-July, 2017):

**article on Topology Reshaping Physics (based on NATURE artcle)**

__Scientific American__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)

======================================================================

**"Topological Hopf and Chain Link Semimetal States and Their Application to Co2MnGa"**

**Theoretical Prediction of Topological Hopf-link semimetals (2017)**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)**

======================================================================

News :

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

======================================================================

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

======================================================================

Talk:

Canadian Institute For Advanced Research (CIFAR)

Summer School Lecture

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

========================================================================

Talk:

KITP Program on Topological Insulators and Topological Superconductors

KITP Link

Lecture PPT Link

======================================================================

Talk:

"Topological Surface States: Discovery and Resecent Results"

Physics Colloquium at Cornell University

Link

======================================================================

Talk:

"Discovery of quantum Hall-like effects without magnetic fields in 3D"

Physics Colloquium at Columbia University

Link

======================================================================

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

======================================================================

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

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)**======================================================================