"A speckle of dust"


Group Members
Quantum Epistemology
Research Publications Lab Facilities
Computation Platform
Collaborators
Internal Links





  Welcome to Hasan Group/Lab website!
Our lab is focused on the 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 quantum-many-body emergence, Bose condensates, quantum coherence, and topological (weakly or strongly interacting, entangled) emergence.
We employ spectroscopy, microscopy and transport methods. Spectroscopy and Transport.

Our research has three anchoring themes: Novel Phases of Matter; Emergent New Particles, and Unexpected Novel Quantum Effects and the main focus is on the fundamental physics aspects 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.


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


Topological Surface States (3D-TI topology) reported in 2007 at Kavil-KITP proceeding


Beyond Topo. Insulators...

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

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)
Other news highlights (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




























Primary experimental techniques & tools
We are currently designing novel next-generation ultrafast spectrometers for exploring quantum coherence and topological control of novel quantum phenomena which is not possible with current generation of ultrafast techniques according to some of our theoretical predictions but relevant for what we call "topotronics".
We invite you to visit our instrumentation (Laboratory for Topological Quantum Matter & Advanced Spectroscopy: B7 B2 B9 and B64, all 4 located in Jadwin Hall) at Princeton physics. Prof. Hasan, Eugene Higgins Professor of Physics at Princeton is also visiting affiliate at Lawrence Berkeley Lab in California; Berkeley Lab page.
We are part of the Princeton University's Quantum Engineering and Engineering-Physics and employ design, simulation, engineering and advanced-instrumentation approaches to our research on quantum matter and novel spectroscopic methods.

In addition to research at our Princeton labs, our group leads, directs or co-leads a number of collaborative projects at national and international laboratories including LBNL (Berkeley), SLAC (Stanford), Brookhaven, Paul Scherrer Inst (Switzerland), SOLEIL (Fr), Rutherford-Appleton lab (Oxfordshire, UK) and Theory Team on Topological Matter .

Theory to Experiments to Patents

























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



 
  NbSe2  
  NbSe2  
  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).

 
 
 
DS


Moore Symposium Lecture (2014)
 
 
  DS

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