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Resonant Tunneling Spectroscopy to Probe the Giant Stark Effect in Atomically Thin Materials
Author(s) -
Zheng Shoujun,
Jo Sanghyun,
Kang Kyungrok,
Sun Linfeng,
Zhao Mali,
Watanabe Kenji,
Taniguchi Takashi,
Moon Pilkyung,
Myoung Nojoon,
Yang Heejun
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201906942
Subject(s) - quantum tunnelling , materials science , quasiparticle , spectroscopy , scanning tunneling spectroscopy , heterojunction , semiconductor , condensed matter physics , optoelectronics , inelastic electron tunneling spectroscopy , stark effect , nanotechnology , electric field , physics , quantum mechanics , superconductivity
Abstract Each atomic layer in van der Waals heterostructures possesses a distinct electronic band structure that can be manipulated for unique device operations. In the precise device architecture, the subtle but critical band splits by the giant Stark effect between atomic layers, varied by the momentum of electrons and external electric fields in device operation, has not yet been demonstrated or applied to design original devices with the full potential of atomically thin materials. Here, resonant tunneling spectroscopy based on the negligible quantum capacitance of 2D semiconductors in resonant tunneling transistors is reported. The bandgaps and sub‐band structures of various channel materials could be demonstrated by the new conceptual spectroscopy at the device scale without debatable quasiparticle effects. Moreover, the band splits by the giant Stark effect in the channel materials could be probed, overcoming the limitations of conventional optical, photoemission, and tunneling spectroscopy. The resonant tunneling spectroscopy reveals essential and practical information for novel device applications.