Anomalous conductance steps in three-dimensional topological insulator HgTe-based quantum point contacts
We explore electrical transport through a point contact in strained HgTe, a three-dimensional topological insulator. In the absence of a magnetic field <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mi>B</a:mi></a:math>, there is no quantization. However, under higher magnetic fields, we observe distinct noninteger conductance steps. Based on numerical tight-binding calculations and a phenomenological Landauer-Büttiker approach, we attribute these atypical, noninteger quantized plateaus to significant scattering effects at the point contact.
Authors
- Cosimo Gorini (ORCID: https://orcid.org/0000-0002-3197-8322)
- Wolfgang Himmler (ORCID: https://orcid.org/0000-0002-8706-4626)
- Stefan Hartl
- Michael Barth (ORCID: https://orcid.org/0000-0003-4521-8620)
- Н. Н. Михайлов (ORCID: https://orcid.org/0009-0007-7474-102X)
- Angelika Knothe (ORCID: https://orcid.org/0000-0003-4488-5958)
- D. A. Kozlov (ORCID: https://orcid.org/0000-0003-0639-8980)
- Klaus Richter (ORCID: https://orcid.org/0000-0001-7296-4237)
- Elisabeth Richter
- Juliane Steidl
Institutions
- Université Paris-Saclay (FR)
- Institute of Semiconductor Physics (RU)
- University of Regensburg (DE)
Publication Details
- Journal
- Physical Review Research
- Published
- 2025-03-11
- DOI
- https://doi.org/10.1103/physrevresearch.7.013260
- Citations
- 1
- Primary Topic
- Topological Materials and Phenomena
- Type
- article
- Field-Weighted Citation Impact
- 1.25
Funders
- Deutsche Forschungsgemeinschaft
- European Research Council
- Horizon 2020