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  Welcome to Hasan Group/Lab website! Our lab is focused on the search/prediction/discovery/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.

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 (1) and emergent New Particles/Properties (2) 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 (3). Our research on these topics have been featured in "Search & Discovery" News and feature article in PhysicsToday, PhysicsWorld, Scientific American, NatureNews (homepage), ScienceNews, NewScientist, Discover magazine, Nature Research, PNAS, Princeton News, SLAC/Stanford News, Berkeley Lab News etc. multiple times over the last ten years.
Recent publications

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's Quantum Engineering and Engineering-Physics and employ design, simulation, engineering and advanced-instrumentation approaches to our research on quantum matter.

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 (France) and Rutherford-Appleton lab (Oxfordshire, UK). Broad-level introduction to these projects 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..

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


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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



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  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