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.com
Volume 3, Issue 2
ISSN: 2470-9905
Crystallography 2017
October 16-17, 2017
2
nd
International Conference on
October 16-17, 2017 | Chicago, USA
Applied Crystallography
Spin-layer locking in globally centrosymmetric but locally non-centrosymmetric two dimensional materials
Chao-Xing Liu
Pennsylvania State University, USA
I
n this talk, I will discuss a novel phenomenon called spin-layer locking and its physical consequence in a new class of two
dimensional materials with the crystal structure that is globally centrosymmetric but locally non-centrosymmetric. I will give
three examples: Mono-layer PtSe
2
film, a tri-layer (LaO)
2
(SbSe
2
)
2
film and a bi-layer NbSe
2
superconductors. Firstly, I will discuss a
theoretical analysis of the recent surprising experimental observation of helical spin texture in a centrosymmetric mono-layer PtSe
2
film by the angle-resolved photoemission spectroscopy. This observation can be explained by dipole induced Rashba effect with
spin-layer locking: Opposite spins are degenerate in energy, while spatially separated in the top and bottom Se layers. In my next
example of a tri-layer (LaO)
2
(SbSe
2
)
2
film with a similar dipole induced Rashba effect and spin-layer locking, I will discuss a direct
physical consequence, electrically tunable multiple Dirac cones, due to the narrow band gap in this system. Finally, I will discuss a two
dimensional superconducting material, bilayer NbSe
2
, and show that a finite momentum pairing (known as Fulde-Ferrell-Larkin-
Ovchinnikov pairing) can be induced by in-plane magnetic fields due to the spin-layer locking.
lcxlight@gmail.comStruct Chem Crystallogr Commun, 3:2
DOI: 10.21767/2470-9905-C1-003