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

Kai Chang, Brandon J. Miller, Hao Yang, Haicheng Lin, Stuart S. P. Parkin, Salvador Barraza-Lopez, Qi-Kun Xue, Xi Chen, and Shuai-Hua Ji
Phys. Rev. Lett. 122, 206402 – Published 24 May 2019
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Abstract

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.

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  • Received 3 February 2019

DOI:https://doi.org/10.1103/PhysRevLett.122.206402

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Kai Chang1,2,3, Brandon J. Miller4, Hao Yang2, Haicheng Lin1,3, Stuart S. P. Parkin2,*, Salvador Barraza-Lopez4, Qi-Kun Xue1,3, Xi Chen1,3,†, and Shuai-Hua Ji1,3,5,‡

  • 1State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
  • 2Max-Planck Institute of Microstructure Physics, Weinberg 2, 06120 Halle (Saale), Germany
  • 3Collaborative Innovation Center of Quantum Matter, Beijing 100084, China
  • 4Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA
  • 5RIKEN Center for Emergent Matter Science (CEMS)-Wako, Saitama 351-0198, Japan

  • *stuart.parkin@mpi-halle.mpg.de
  • xc@mail.tsinghua.edu.cn
  • shji@mail.tsinghua.edu.cn

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Issue

Vol. 122, Iss. 20 — 24 May 2019

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