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Topology Hierarchy of Transition Metal Dichalcogenides Built from Quantum Spin Hall Layers

Journal Article · · Advanced Materials
 [1];  [2];  [3];  [4];  [5];  [6];  [4];  [7];  [7];  [4];  [8];  [8];  [9];  [3];  [8];  [8];  [4];  [10]
  1. Tsinghua Univ., Beijing (China); SLAC
  2. Wuhan Univ. (China)
  3. Peking Univ., Beijing (China)
  4. ShanghaiTech Univ. (China). Laboratory for Topological Physics
  5. ShanghaiTech Univ. (China)
  6. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  7. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
  8. Tsinghua Univ., Beijing (China)
  9. Nanjing Univ. (China)
  10. ShanghaiTech Univ. (China). Laboratory for Topological Physics; Univ. of Oxford (United Kingdom). Clarendon Lab.
The evolution of the physical properties of 2D material from monolayer limit to the bulk reveals unique consequences from dimension confinement and provides a distinct tuning knob for applications. Monolayer 1T'-phase transition metal dichalcogenides (1T'-TMDs) with ubiquitous quantum spin Hall (QSH) states are ideal 2D building blocks of various 3D topological phases. However, the stacking geometry has been previously limited to the bulk 1T'-WTe2 type. Here, the novel 2M-TMDs consisting of translationally stacked 1T'-monolayers are introduced as promising material platforms with tunable inverted bandgaps and interlayer coupling. By performing advanced polarization-dependent angle-resolved photoemission spectroscopy as well as first-principles calculations on the electronic structure of 2M-TMDs, a topology hierarchy is revealed: 2M-WSe2, MoS2, and MoSe2 are weak topological insulators (WTIs), whereas 2M-WS2 is a strong topological insulator (STI). Further demonstration of topological phase transitions by tunning interlayer distance indicates that band inversion amplitude and interlayer coupling jointly determine different topological states in 2M-TMDs. Finally, it is proposed that 2M-TMDs are parent compounds of various exotic phases including topological superconductors and promise great application potentials in quantum electronics due to their flexibility in patterning with 2D materials.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
Sponsoring Organization:
National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC); Science and Technology Commission of Shanghai Municipality (STCSM); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC02-05CH11231; AC02-76SF00515
OSTI ID:
1998170
Alternate ID(s):
OSTI ID: 2228870
Journal Information:
Advanced Materials, Journal Name: Advanced Materials Journal Issue: 21 Vol. 35; ISSN 0935-9648
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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