Otteneder, Maximilian and Sacre, Daniel and Yahniuk, Ivan and Budkin, Grigory V. and Diendorfer, Kilian and Kozlov, Dmitry A. and Dmitriev, Ivan A. and Mikhailov, Nikolay N. and Dvoretsky, Sergey A. and Bel'kov, Vasily V. and Knap, Wojciech and Ganichev, Sergey D. (2021) Terahertz Magnetospectroscopy of Cyclotron Resonances from Topological Surface States in Thick Films of CdxHg1-xTe. PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS, 258 (1): 2000023. ISSN 0370-1972, 1521-3951
Full text not available from this repository. (Request a copy)Abstract
Herein, studies of the cyclotron resonance (CR) in thick CdxHg1-xTe films with different cadmium contents corresponding to materials with and without band inversion, as well as critical content corresponding to an almost linear energy dispersion are presented. The results demonstrate that the formation of 2D topological surface states requires sharp interfaces between layers with and without band inversion, in which case the corresponding CR is clearly observed for the out-of-plane orientation of magnetic field but does not show up for an in-plane orientation. In contrast, all samples having more conventional technological design with smooth interfaces (i.e., containing regions of CdxHg1-xTe with gradually changing Cd content x) show equally pronounced CR in both in-plane and out-of-plane magnetic field revealing that CR is excited in effectively 3D states. Modeling of the surface states for different film designs supports main observations. In all samples, additional broad helicity-independent resonances are observed, which are attributed to photoionization and magnetic freeze-out of impurity states.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ELECTRONS; CdHgTe films; cyclotron resonances; magnetospectroscopy; surface states; terahertz; topological Volkov-Pankratov states |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Professor Ganichev > Group Sergey Ganichev |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 17 Jan 2022 16:11 |
| Last Modified: | 17 Jan 2022 16:11 |
| URI: | https://pred.uni-regensburg.de/id/eprint/44608 |
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