Research Achievement

Title: Semiconductor–metal transition in Bi2Se3 caused by impurity doping   Authors: T. Uchiyama, H. Goto, E. Uesugi, A. Takai, L. Zhi, A. Miura, S. Hamao, R. Eguchi, H. Ota, K. Sugimoto, A. Fujiwara, F. Matsui, K. Kimura, K. Hayashi, T. Ueno, K. Kobayashi, J. Akimitsu, Y. Kubozono   Abstract: Doping a typical topological insulator, Bi2Se3, with Ag impurity causes a semiconductor–metal (S-M) transition at 35 K. To deepen the understanding of this phenomenon, structural and transport properties of Ag-doped Bi2Se3 were studied. Single-crystal X-ray diffraction (SC-XRD) showed no structural transitions but slight shrinkage of the lattice, indicating no structural origin of the transition. To better understand electronic properties of Ag-doped Bi2Se3, extended analyses of Hall effect and electric-field effect were carried out. Hall effect measurements revealed that the reduction of resistance was accompanied by increases in not only carrier density but carrier mobility. The field-effect mobility is different for positive and negative gate voltages, indicating that the EF is located at around the bottom of the bulk conduction band (BCB) and that the carrier mobility in the bulk is larger than that at the bottom surface at all temperatures. The pinning of the EF at the BCB is found to be a key issue to induce the S-M transition, because the transition can be caused by depinning of the EF or the crossover between the bulk and the top surface transport.   Link: Sci. Rep. 13 (2023) 537. DOI: 10.1038/s41598-023-27701-5

2023.01.11.Wed

Title: Semiconductor–metal transition in Bi2Se3 caused by impur…
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2022.10.31.Mon

Title: Charge Transport Capabilities of Dibenzo[n]phenacenes (n…
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2022.03.04.Fri

Title: Fabrication and Characterization of Thin-Film ZnO/Cu-O Heterostructure Prepared by Spin Coat…
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2021.09.20.Mon

Title: Elimination of Oxygen Defects in In-Si-O Film and Thin F…
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2021.09.13.Mon

Title: Strain-Controlled Spin Transition in Heterostructured Metal−Organic Framework Thin Film &nb…
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2021.06.25.Fri

eBook Functional Thin Films Technology has been published. &…
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2021.02.16.Tue

Title: Fabrication of ring oscillators using organic molecules…
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2020.04.13.Mon

Title: Solution-Processed Cupric Oxide P-type Channel Thin-Fil…
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2020.03.16.Mon

Title: Inhomogeneous superconductivity in thin crystals of FeS…
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2020.02.26.Wed

Title: X-ray absorption near edge structure and extended X-ra…
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