Electron tunneling through double-electric barriers on HgTe/CdTe heterostructure interface
Liang-Zhong Lin(林亮中)1, Yi-Yun Ling(凌艺纭)2, Dong Zhang(张东)3, and Zhen-Hua Wu(吴振华)4,†
1 School of Information Engineering, Zhongshan Polytechnic, Zhongshan 528400, China; 2 School of Physics and Material Sciences, Guangzhou University, Guangzhou 510000, China; 3 SKLSM, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China; 4 MEDIT, Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029, China
Abstract We investigate theoretically the carrier transport in a two-dimensional topological insulator of (001) HgTe/CdTe quantum-well heterostructure with inverted band, and find distinct switchable features of the transmission spectra in the topological edge states by designing the double-electric modulation potentials. The transmission spectra exhibit the significant Fabry-Pérot resonances for the double-electric transport system. Furthermore, the transmission properties show rich behaviors when the Fermi energy lies in the different locations in the energy spectrum and the double-electric barrier regions. The opacity and transparency of the double-modulated barrier regions can be controlled by tuning the modulated potentials, Fermi energy and the length of modulated regions. This electrical switching behavior can be realized by tuning the voltages applied on the metal gates. The Fabry-Pérot resonances leads to oscillations in the transmission which can be observed in experimentally. This electric modulated-mechanism provides us a realistic way to switch the transmission in edge states which can be constructed in low-power information processing devices.
Fund: Project supported by the College Innovation Project of Guangdong Province (Grant No. 2020KTSCX329), the Social Public Welfare and Basic Research Project of Zhongshan City (Grant No. 2020B2044), Zhongshan Polytechnic Highlevel Talents Project (Grant No. KYG2102), the National Key R&D Program of China (Grant No. 2021YFA1200502), and the National Natural Science Foundation of China (Grant No. 12174423).
Liang-Zhong Lin(林亮中), Yi-Yun Ling(凌艺纭), Dong Zhang(张东), and Zhen-Hua Wu(吴振华) Electron tunneling through double-electric barriers on HgTe/CdTe heterostructure interface 2022 Chin. Phys. B 31 117201
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