Crossover from 2D metal to 3D Dirac semimetal in metallic PtTe2 films with local Rashba effect

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Ke Deng
  • Mingzhe Yan
  • Chu-Ping Yu
  • Jiaheng Li
  • Xue Zhou
  • Kenan Zhang
  • Yuxin Zhao
  • Koji Miyamoto
  • Taichi Okuda
  • Wenhui Duan
  • Yang Wu
  • Shuyun Zhou

Detail(s)

Original languageEnglish
Pages (from-to)1044-1048
Journal / PublicationScience Bulletin
Volume64
Issue number15
Online published24 May 2019
Publication statusPublished - 15 Aug 2019
Externally publishedYes

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 films. 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.

Research Area(s)

  • Dirac semimetal, Local Rashba effect, PtTe2, Topological semimetal, Topological superconductivity

Citation Format(s)

Crossover from 2D metal to 3D Dirac semimetal in metallic PtTe2 films with local Rashba effect. / Deng, Ke; Yan, Mingzhe; Yu, Chu-Ping; Li, Jiaheng; Zhou, Xue; Zhang, Kenan; Zhao, Yuxin; Miyamoto, Koji; Okuda, Taichi; Duan, Wenhui; Wu, Yang; Zhong, Xiaoyan; Zhou, Shuyun.

In: Science Bulletin, Vol. 64, No. 15, 15.08.2019, p. 1044-1048.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review