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

Chang, Kai; Miller, Brandon J.; Yang, Hao; Lin, Haicheng; Parkin, Stuart S. P.; Barraza-Lopez, Salvador; Xue, Qi-Kun; Chen, Xi; Ji, Shuai-Hua

doi:10.1103/physrevlett.122.206402

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

Journal Article · Fri May 24 00:00:00 EDT 2019 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.122.206402· OSTI ID:1612402

Chang, Kai ^[1]; Miller, Brandon J. ^[2]; Yang, Hao ^[3]; Lin, Haicheng ^[4]; Parkin, Stuart S. P. ^[3]; Barraza-Lopez, Salvador ^[2]; Xue, Qi-Kun ^[4]; Chen, Xi ^[4]; Ji, Shuai-Hua ^[5]

Tsinghua Univ., Beijing (China); Max-Planck Inst. of Microstructure Physics, Halle (Germany); Collaborative Innovation Center of Quantum Matter, Beijing (China)
Univ. of Arkansas, Fayetteville, AR (United States)
Max-Planck Inst. of Microstructure Physics, Halle (Germany)
Tsinghua Univ., Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)
Tsinghua Univ., Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China); RIKEN Center for Emergent Matter Science (CEMS)-Wako, Saitama (Japan)

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 (E_V), 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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Research Organization:: Univ. of Arkansas, Fayetteville, AR (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC)

Grant/Contract Number:: SC0016139; 51561145005; 11574175; 11622433

OSTI ID:: 1612402

Alternate ID(s):: OSTI ID: 1515593

Journal Information:: Physical Review Letters, Vol. 122, Issue 20; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 20 works

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