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Standing Waves Induced by Valley-Mismatched Domains in Ferroelectric SnTe Monolayers

Journal Article · · Physical Review Letters
 [1];  [2];  [3];  [4];  [3];  [2];  [4];  [4];  [5]
  1. Tsinghua Univ., Beijing (China); Max-Planck Inst. of Microstructure Physics, Halle (Germany); Collaborative Innovation Center of Quantum Matter, Beijing (China); DOE/OSTI
  2. Univ. of Arkansas, Fayetteville, AR (United States)
  3. Max-Planck Inst. of Microstructure Physics, Halle (Germany)
  4. Tsinghua Univ., Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)
  5. Tsinghua Univ., Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China); RIKEN Center for Emergent Matter Science (CEMS)-Wako, Saitama (Japan)
+ Show Author Affiliations
Two-dimensional (2D) quasiparticle standing waves originate from the interference of coherent quantum states and are usually created by the scattering off edges, atomic steps, or adatoms that induce large potential barriers. We report standing waves close to the valence band maximum (EV), confined by electrically neutral domain walls of newly discovered ferroelectric SnTe monolayers, as revealed by spatially resolved scanning tunneling spectroscopy. Ab initio calculations show that this novel confinement arises from the polarization lifted hole valley degeneracy and a ~90° rotation of the Brillouin zones that render holes’ momentum mismatched across neighboring domains. These results show a potential for polarization-tuned valleytronics in 2D ferroelectrics.
Research Organization:
Univ. of Arkansas, Fayetteville, AR (United States)
Sponsoring Organization:
National Natural Science Foundation of China; USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0016139
OSTI ID:
1612402
Alternate ID(s):
OSTI ID: 1515593
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 20 Vol. 122; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (3)

The rise of 2D dielectrics/ferroelectrics journal December 2019
Emergence of the giant out-of-plane Rashba effect and tunable nanoscale persistent spin helix in ferroelectric SnTe thin films journal January 2020
Group-IV monochalcogenide monolayers: Two-dimensional ferroelectrics with weak intralayer bonds and a phosphorenelike monolayer dissociation energy journal December 2019

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Related Subjects

2-dimensional systems
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Ab initio calculations
Density of states
Ferroelectricity
Physics
Scanning tunneling microscopy