Seminar：Two-dimensional materials and hetero-structures for new topological phases, tailored electronic and spin structures

Time: 2:00pm, September 19^th (Monday)

Place: Room 423 in the Physics Building, Yuquan Campus

Prof. Shuyun Zhou

Department of Physics, Tsinghua University, Beijing, P.R. China 100084

syzhou@mail.tsinghua.edu.cn

Abstract:

Two-dimensional materialsand hetero-structures provide an important playground for realizing novel topological quantum phasesas well astailored electronic and spin textures with potential applications. In this talk, I will first presentourrecent works on the experimental realization of Lorentz violating type-II Weyl fermions in MoTe₂ [1,2]and type-II Dirac fermions in PtTe₂ [3]. I will also present our recent angle-resolved photoemission spectroscopic study ofgraphene/h-BN hetero-structure, which shows gaps induced by inversion symmetry breaking and second generation Dirac cones[4].

 

References:

1. Ke Deng et al., “Experimental observation of topological Fermi arcs in type-II Weyl semimetal MoTe₂”, arXiv:1603.08508,Nature Physics, in press,doi:10.1038/nphys3856.

2. Kenan Zhanget al, “Raman signatures of inversion symmetry breaking and structural phase transition in type-II Weyl semimetal MoTe₂”, arXiv:1603.08508.

3. Mingzhe Yanet al., “Lorentz-violating type-II Dirac fermions in transition metal dichalcogenide PtTe₂”, arXiv:1607.03643.

4. Eryin Wanget al., Second generation Dirac cones and inversionsymmetry breaking induced gaps in graphene/h-BN, arXiv:1603.01814, Nature Physics, in press, DOI:10.1038/nphys3871.