Savchenko, M. L. and Kozlov, D. A. and Vasilev, N. N. and Mikhailov, N. N. and Dvoretsky, S. A. and Kvon, Z. D. (2023) Transport properties of a 1000 nm HgTe film: the interplay of surface and bulk carriers. JOURNAL OF PHYSICS-CONDENSED MATTER, 35 (34): 345302. ISSN 0953-8984, 1361-648X
Full text not available from this repository. (Request a copy)Abstract
We report on systematic study of transport properties of a 1000 nm HgTe film. Unlike thinner and strained HgTe films, which are known as high-quality three-dimensional topological insulators, the film under study is much thicker than the limit of pseudomorphic growth of HgTe on a CdTe substrate. Therefore, the 1000 nm HgTe film is expected to be fully relaxed and has the band structure of bulk HgTe, i.e. a zero gap semiconductor. Additionally, the system is characterized by the bands inversion, so that the two-dimensional topological surface states (TSSs) are expected to exist. To check this claim we studied classical and quantum transport response of the system. We demonstrate that by tuning the top-gate voltage one can change the electron-dominating transport to the hole one. The highest electron mobility is found to be more than 300 x 10(3) cm(2) Vs(-1). The system exhibits Shubnikov-de Haas (SdH) oscillations with a complicated pattern and shows up to five independent frequencies in corresponding Fourier spectra. These Fourier peaks are attributed to the TSSs, Volkov-Pankratov states and spin-degenerate bulk states in the accumulation layer near the gate. The observed peculiarities of the quantum transport are the strong SdH oscillations of the Hall resistance, and the suppressed oscillatory response of the TSSs.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | MAGNETIC-FIELD; ELECTRON; CONDUCTIVITY; DENSITY; STATES; quantum transport; HgTe; topological surface states; thick films |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Weiss > Group Dieter Weiss |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 16 Mar 2024 11:37 |
| Last Modified: | 16 Mar 2024 11:37 |
| URI: | https://pred.uni-regensburg.de/id/eprint/60149 |
Actions (login required)
 |
View Item |
