"A speckle of dust"

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  Welcome to Hasan Group/Lab website!
Our lab is focused (funded to work) on the conceptualization, search/design, prediction, discovery and development of new physics of quantum matter. Currently, we design/grow/control/engineer properties of quantum matter, perform first-principles/DFT-LDA-TBT/analytic theoretical predictions and develop spectroscopic techniques and related tools that provide new insights into the emergent behavior of matter. We are interested in novel physics of quantum-many-body emergence, condensates, quantum coherence, and topological (weakly or strongly interacting, entangled) emergence.
We employ spectroscopy, microscopy and transport methods. Spectroscopy and Transport.

Laboratory Theme: QFT, Topology & (many-body) Emergence in the Quantum Matter Universe

Our research has three anchoring themes: Novel Phases of Matter; Emergent New Particles, and Unexpected Novel Quantum Effects; the main focus is on the fundamental physics of exotic quantum matter. We search for or work on natural or artificially designed Novel Phases of Matter and emergent New Particles/Properties and also explore Quantum Many-Body Physics. Artificially designed matter is directed towards quantum simulations.

We explore quantum many-body systems in search of unpredicted Unexpected Novel Quantum Effects. Our research on these topics have been featured in "Search & Discovery" News and/or feature article in Physics Today, Physics World, Scientific American, Nature News (homepage), Science News, New Scientist, Discover magazine, Nature Research, PNAS, Princeton News, SLAC/Stanford News, Berkeley Lab News etc. multiple times over the last twelve years.
A vast majority of our research has been based on our own theoretical predictions of novel materials.

Topological Insulators grown (made) in Hasan Lab
funded by U.S. Dept. of Energy (DOE)

Theory to Experiments (Spectroscopy & Transport) to Patents
2005 - 2007
Topological Surface States during 2005-2007 at Berkeley Lab
Experiments 2005-2007 conclusion reported at KITP (2007)
"Search and Discovery" news at Physics Today

Work done during 2005-07, 3D-TI topology expt. completed in 2007

Topo Surface States discovered during 2005-2007
American Inst of Physics (AIP) oral history archive (Kane)


Topological Surface States (3D-TI topology as a bulk-surface/boundary correspondence) reported in 2007 at Kavil-KITP proceeding (Berkeley & Princeton, 2007)

Berkeley & Princeton Lab research during 2005-2007

News / PressRelease

Princeton & SLAC/Stanford research

News / PressRelease

Beyond Topo. Insulators...

"Discovery of Topological Magnets in 2D and 3D" (APS talk-2)

Discovery of Topological Magnets in 2D and 3D (Chern, Kagome and Weyl magnets) (APS talk-1)
Spectroscopy and Transport.

Physics World Top Ten Breakthrough

Topo Surface States discovered during 2005-2007
American Inst of Physics (AIP) oral history archive (Kane)


Theoretical Discovery of Novel Topological Materials

Topo. Magnets, Hopf-link and Weyl Magnets: Discovery and the New Frontiers

Quantum-limit Chern magnet (NATURE'20)

Topological Superconductors

Physics Today "Search & Discovery" [Experiments 2005-2008]
Magnetic Weyl semimetal discovery at Stanford Lab (SSRL/SLAC news)
Physics Today (2020)
National Science Foundation (NSF) News (2020)

PhysicsWorld 2019
Theory (Materials), Spectrosocopy & Transport:
Discovery of Magnetic Weyl SM (PhysicsWorld 2019; SCIENCE 2019; APS talk 2019; Princeton News 2019)
Discovery of tuneable Topo. Kagome Magnet (PhysicsWorld 2018; NATURE 2019; APS 2019; Princeton 2018)
Discovery of Topo. Chiral Crystals RhSi (Theory PRL 2017--> NATURE 2019; PhysicsWorld 2019; APS 2019)
Physics Today 2019
Exotic Superconductivity and P.W.Anderson theorem (Princeton 2019)
Discovery of a quantum limit Chern magnet TbMn6Sn6 (2020)
Topological Magnets and Beyond ...
Theoretical Prediction of quantized circular photogalvanic effect in topological chiral crystal RhSi (PRL 2017)
Theoretical Prediction of topological quantum properties of chiral crystals (Nature Materials 2018)
Theoretical Prediction and Discovery of Novel "Topological Quantum Matter"
Discovery of a Weyl magnet (SSRL/SLAC(Stanford) 2020 )

Majorana zero modes ...
Chiral Majorana Fermion Modes on the Surface of Superconducting Topo. Insulators
Momentum-space imaging of Cooper pairing in a half-Dirac-gas topological superconductor (Majorana platform)
Topo. Superconductivity and Majorana zero modes Chiral Majorana Fermion Modes...
Field-free platform for Majorana-like zero mode in superconductors with a topological surface state (2020)

Atomic-resolution low-temp vector-field controlled STM/STS to probe Topo.Matter

10+ group members at Hasan lab recognized for high-impact research:
Lab members including Alidoust, Belopolski, Bian, G.Chang, T.Chang, Hasan, Neupane, Qian, Sanchez, Zheng, Xu - all listed as
"Highly-Cited Researchers" (2019)
by the Institute for Scientific Information (Clarivate Analytics) based on Web of Science
Many of the lab members' works gathered 10,000+ citation (cited by other researchers world-wide) each within a short period of time.

Anyon/Majorana research is supported by Princeton University funds and also external grant awards including the U.S. DOE (Quantum Information Science, QIS program under National Quantum Initiative, NQI) and Moore Foundation

STM Review article:
Probing topological matter with scanning tunnelling microscopy

Nature Reviews Physics 3, 249-263 (2021)

Materials Discovery:

Weyl, Dirac & Chiral fermions in Topological Materials

Nature Reviews Materials 6, 784–803 (2021)

Strongly Correlated Matter (perspective review article):

Charge-order and Superconductivity in Kagome materials

Nature Physics 18, 137–143 (2022)

Strongly Correlated Matter:

Time-reversal symmetry-breaking charge order in a kagome superconductor

NATURE 602, 245-250 (2022)

R.H. Dicke symposium talk (2021)

Quantum Many-Body Physics:

(Unpredicted) and/or Unexpected Novel Quantum Effects (Link)

Correlated phases of fermions in Kagome lattices:
Featured in condmat journal club (2021)
Kagome lattices with chiral charge density (2021)
Nature Materials 20, 1308-1309 (2021)

Time-reversal symmetry-breaking charge order in a kagome superconductor
NATURE602, 245-250 (2022)

Discovery of unconventional chiral charge order in the normal state of kagome superconductor KV3Sb5
Nature Materials (2021)
Giant and anisotropic many-body spin-orbit tunability in a strongly correlated kagome magnet
Nature 562, 91-95 (2018)
Many-body Resonance in a Correlated Topological Kagome Antiferromagnet
Physical Review Letters 125, 046401 (2020)
Anomalous transport and chiral charge order in kagome superconductor CsV3Sb5
arXiv:2105.04542 (2021)
Rare earth engineering (of many-body physics) in topological kagome magnets arXiv:2007.09913 (2020)
Physical Review Letters (2021)
Nodeless kagome superconductivity in LaRu3Si2 (Novel kagome superconductors)
Phys. Rev. M 5, 034803 (2021)
Fermion-boson many-body interplay in a frustrated kagome paramagnet
Nature Commun. 11, 4003 (2020)
Negative flatband magnetism in a spin-orbit coupled kagome magnet
Nature Physics 15, 443 (2019)
Quantum-limit Chern magnetism in topological kagome magnet
Nature 583, 533-536 (2020)
Unconventional Scaling of the Superfluid Density with the Critical Temperature in TMD superconductors
Science Advances 5, eaav8465 (2019)
Spin-orbit quantum impurity (many-body physics) in a topological kagome magnet
Nature Commun. 11, 4415 (2020)
Tunable chiral charge order in kagome superconductor RbV3Sb5
arXiv:2105.00550 (2021)
Observation of metallic surface states in the strongly correlated Kitaev-Heisenberg candidate
Phys. Rev. B 93, 245132 (2016)
Fermi surface topology and hot spot distribution in the Kondo lattice system CeB6.
Phys. Rev. B 92, 104420 (2015).
Quantum phase transition of correlated iron-based superconductors
Physical Review Letters 123, 217004 (2019)
Fermi surface topology and quasiparticle dynamics of host cobaltate superconductors
Physical Review Letters 92, 246402 (2004).
Momentum dependence of superconducting gap, strong-coupling dispersion kink, and tightly bound Cooper pairs in the high-Tc (Sr,Ba)1-x(K,Na)xFe2As2 superconductors.
Phys. Rev. B 78, 184508 (2008).
Low-lying quasiparticle modes and hidden collective charge instabilities in parent cobaltates superconductors.
Physical Review Letters 96, 216405 (2006).
Emergence of Fermi Pockets in a New Excitonic Charge-Density-Wave Melted Superconductor.
Physical Review Letters 98, 117007 (2007).
Fermi surface topology and low-lying quasiparticle dynamics of parent Fe1+xTe/Se superconductor.
Physical Review Letters 103, 037002 (2009).
Quasiparticle Dynamics in the Vicinity of Metal-Insulator Phase Transition in Correlated Cobaltates.
Physical Review Letters 96, 046407 (2006).

Broad-level introduction to projects, advanced instruments and collaboration details can be found in the following research or science-news items/articles (for students and researchers interested to join-in/collaborate):

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

Topo. Insulators to emergent Weyl fermions and Beyond..: Princeton; Nature News; Discover magazine

PhysicsWorld (2018): Topological Magnets and Beyond

Scientific American : The Strange Topology That Is Reshaping Physics

Stanford University (News) "New spectroscopy takes aim at an unsolved electronics mystery"

ALS/Berkeley Lab (News) "ALS(Berkeley Lab) Reveals New State of Matter: Topological Insulators"

Momentum-space imaging of Cooper pairing in a half-Dirac-gas topological superconductor (Nature Physics)

Princeton (News at QSE) Artificial Topological Quantum Matter Lattice

A vast majority of our experimental works are based on
our own theoretical predictions of materials (link)

Interview with Nature News (2017) : Topological Materials (NATURE Homepage, July/2017)

(Theoretical Prediction of) Topological Hopf-linked matter (2017) (PRL Homepage, Oct/2017)

(Theoretical Prediction of) New Type of Weyl Semimetals (Proc. of Nat. Academy of Sci. PNAS/2015)

"Weyl Semimetals, Fermi Arcs and Chiral Anomalies" Nature Materials (FOCUS issue)

Physics Today's "Search & Discovery" (News)

PhysicsWorld article (July, 2015)

Interview with PhysicsWorld (2016)

Interview with Science News (2017) : Weyl Metals

Interview with IEEE news (2017) : Weyl materials

Interview with PhysicsWorld (2016) : Topological Insulators

Science Talk (Physics-Next, APS-Physics/PRL): Quantum Fields to Condensed Matter..

2017 Sir Nevill Mott Lecture Series in Physics (London): New Topological Phases of Matter

2015 S.N. Bose Seminar (Public Lecture): New Topological Phases of Matter (including Bose Condensates)

2017 Miller Professorship Talk (Science Lecture) at Miller Institute of Basic Research (Berkeley)

2016 Moore Symposium Talk on Topological Matter at Gordon and Betty Moore Foundation (California)

SLAC(Stanford) Research Highlight/SSRL (News) Macroscopic Quantum Insulator State Observed

Berkeley Lab (homepage news) Weyl Fermion Research ‘Top Ten Breakthrough of 2015’

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

Princeton University (News): Unique duality: Princeton-led team discovers ‘exotic’ superconductor with metallic (Dirac) surface states

Feature article (News) at Proceedings of National Academy of Sciences: Topological Insulators

Physics Today's "Commentary and Reviews" (News)

Interview with PhysicsWorld (2016) : Topological Metals/Conductors

Moore Foundation (News) "Engineering topological states opens new frontier in quantum materials"

U.S. Dept. of Energy User Facility News "How X-rays Pushed Topological Matter Research Over the Top (2017)"

Giant and anisotropic many-body spin–orbit tunability in a strongly correlated kagome magnet (NATURE 2018)

DISCOVER magazine Topological Insulators to Weyl, Majorana fermions etc. (2018)
"An obscure mathematical field might bring about a new era in technology" (DISCOVER)

Chiral Majorana Fermion Modes on the Surface of Superconducting Topological Insulators (2018)

(NEWS) "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


Note: This website is organized according to research topics/subtopics. If a specific paper covers multiple themes or overlapping topics it (the same paper) may appear in multiple pages for the complete flow of a particular theme contained in that page. For a full list of publications see list


  Intrinsic Topological Insulators

  Transport in TopoInsulator: Demonstration of a Fully Bulk Insulating (Intrinsic) Topological Insulator
Observation of topological surface state quantum Hall effect in an intrinsic three-dimensional topological insulator.
Published in Y. Xu, I. Miotkowski, C. Liu, J. Tian, H. Nam, N. Alidoust, J. Hu, C.-K. Shih, M. Z. Hasan and Y. P. Chen,
Nature Physics 10, 956 (2014).


Moore Symposium Lecture (2014)

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

Topo Surface States discovered during 2005-2007
American Inst of Physics (AIP) oral history archive (Kane)