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Crossover from 2D metal to 3D Dirac semimetal in metallic PtTe2 films with local Rashba effect | Ke Deng
; Mingzhe Yan
; Zhuping Yu
; Jiaheng Li
; Xue Zhou
; Kenan Zhang
; Yuxin Zhao
; Koji Miyamoto
; Taichi Okuda
; Wenhui Duan
; Yang Wu
; Xiaoyan Zhong
; Shuyun Zhou
; | Date: |
15 May 2019 | Abstract: | PtTe2 and PtSe2 with trigonal structure have attracted extensive research
interests since the discovery of type-II Dirac fermions in the bulk crystals.
The evolution of the electronic structure from bulk 3D topological semimetal to
2D atomic thin films is an important scientific question. While a transition
from 3D type-II Dirac semimetal in the bulk to 2D semiconductor in monolayer
(ML) film has been reported for PtSe2, so far the evolution of electronic
structure of atomically thin PtTe2 films still remains unexplored. Here we
report a systematic angle-resolved photoemission spectroscopy (ARPES) study of
the electronic structure of high quality PtTe2 films grown by molecular beam
epitaxy with thickness from 2 ML to 6 ML. ARPES measurements show that PtTe2
films still remain metallic even down to 2 ML thickness, which is in sharp
contrast to the semiconducting property of few layer PtSe2 film. Moreover, a
transition from 2D metal to 3D type-II Dirac semimetal occurs at film thickness
of 4-6 ML. In addition, Spin-ARPES measurements reveal helical spin textures
induced by local Rashba effect in the bulk PtTe2 crystal, suggesting that
similar hidden spin is also expected in few monolayer PtTe2 films. Our work
reveals the transition from 2D metal to 3D topological semimetal and provides
new opportunities for investigating metallic 2D films with local Rashba effect. | Source: | arXiv, 1905.6273 | Services: | Forum | Review | PDF | Favorites |
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