Hasan Research Group
	Laboratory for Topological Quantum Matter & Advanced Spectroscopy

Group Members
Research

• Correlated Electrons/Emergent
     Phenomena/Many-Body Physics
• New Topological Phases of Matter
• Nanoscience/Atomic-Printing/
     Topotronics
• Crystal Growth/Furnaces/MBE-STM
• RIXS/RXS/XS Technique


• FP/DFT Computation Platform
• Pedagogical Lecture Series


• Beyond Topological Insulators
• Topo. Insulators & Berry's Phase
• Topo. Quant. Phase Transition
• Topo. Superconductors
• Topo. Crystalline Insulators
• Topo. Kondo Insulators
• Magnetic Topo. Insulators
• Dirac Semimetals
• Weyl Fermion Semimetals
• Topological Nodal-Line Fermions
• Majorana Heterostructures
• Heavy Fermions
• Natural Topo. Superconductors
• Search for Emergent Supersymmetry


• High Tc Superconductors
• Doped Mott Insulators
• Spin Chains/Liquids
• Iridates
• Frustrated Spin Systems
• 2D Functional Materials
• Ultrathin Films and Interfaces
• Thermoelectrics


• Advanced ARPES
• Spectroscopy (STM-MBE, ARPES)
• Atomic Force Microscopy (AFM)
• Resonant X-Ray Scattering
• Neutron Scattering
• Pump-Probe Ultrafast Spectroscopy
• Ultra-small & Ultra-fast
• Circular Dichroism and ARPES

Publications

• Review Articles
• Highlights
• Lists
• Theses
• Talks

Lab Facilities
Computation Platform
Collaborators
Internal Links
News

	Pump-Probe Spectroscopy probing ultrafast and ultrasmall..
	We are in the process of designing a novel ultrafast ARPES spectrometer... The new design is based on our past experience with spectroscopic studies of quantum matter (some relevant papers and backgroud materials are available here): Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface Online results at KITP (2007-2008) : KITP Proc. (2007) KITP Proc. (2008) For ultrafast studies: Theoretical discovery of Weyl semimetal class TaAs (PhysicsWorld 2015) Topologically protected Single Dirac Cone (Spin-Textured) Nature Physics With the discovery of Bi-based topological insulators (KITP-2007 and KITP-2008) ultrafast/time-resolved ARPES study gained significant momentum in general. Some of the recents results are here: Phys. Rev. Lett. (2015) "Topological Insulators" and "Weyl Semimetals" highlighted by NATURE's Insight on Quantum Materials along with superconductivity and spin liquids. A related paper is also listed in NATURE's editorial collection of articles related to 2016 Nobel Prize in Physics. Some recent results: Gigantic surface life-time of an intrinsic topological insulator (revealed via time-resolved pump-probe ARPES) M. Neupane, S.-Y. Xu, Y. Ishida, et al.; Phys. Rev. Lett. 115, 116801 (2015) Electronic structure and relaxation dynamics in a superconducting topological material (via time-resolved ARPES) M. Neupane, Y. Ishida, R. Sankar, J.-X. Zhu, D. S. Sanchez, I. Belopolski, S.-Y. Xu, N. Alidoust, M. M. Hosen, S. Shin, F. Chou, M. Z. Hasan et.al., Scientific Reports 6:22557 (2016) Experimental signatures of phase interference and sub-femtosecond time dynamics on the incident energy axis of resonant inelastic x-ray scattering L. Andrew Wray, S.-W. Huang, Y. Xia et.al., Phys. Rev. B 91, 035131 (2015) Tuning a Schottky barrier in a photoexcited topological insulator with transient Dirac cone electron-hole asymmetry (time-resolved (pump-probe) ARPES) M. Hajlaoui, E. Papalazarou, J. Mauchain, et al.; Nature Commun. 5, 3003 (2014) Signatures of a time-reversal symmetric Weyl semimetal with only four Weyl points via time-resolved (pump-probe) ARPES Ilya Belopolski, Peng Yu, Daniel S. Sanchez, Yukiaki Ishida, Tay-Rong Chang, Songtian S. Zhang, Su-Yang Xu, Hao Zheng, Guoqing Chang, Guang Bian, Horng-Tay Jeng, Takeshi Kondo, Hsin Lin, Zheng Liu, Shik Shin & M. Zahid Hasan Nature Commun. 8, 942 (2017)

Frontiers of Ultrafast X-ray science (DOE Report) ..

Front page: Nature Materials FOCUS issue on "Topological Semimetals" ..



Next generation ultrafast spectrometer under development ...