Velocity and confinement of edge plasmons in HgTe-based two-dimensional topological insulators
Source abstract
Abstract
High-frequency transport in the edge states of the quantum spin Hall (QSH) effect has rarely been explored, though it could cast light on the scattering mechanisms taking place therein. Here we report on the measurement of the plasmon velocity in topological HgTe quantum wells both in the QSH and quantum Hall (QH) regimes, using harmonic GHz excitations and phase-resolved detection. We observe low plasmon velocities in both regimes, with, in particular, large transverse widths in the QH regime despite a sharp edge confinement profile. We ascribe these observations to the prominent influence of charge puddles forming in the vicinity of edge channels. Together with other recent works, it suggests that puddles play an essential role in the edge state physics and probably constitute a main hurdle on the way to clean and robust edge transport.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Topological Materials and Phenomena · Graphene research and applications · Electronic and Structural Properties of Oxides
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Laboratoire de Physique de l'École Normale Supérieure, ENS, PSL Research University, CNRS, Sorbonne Université, Université de Paris, 24 rue Lhomond, 75231 Paris Cedex 05, France
NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan
JST, PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
Physikalisches Institut (EP3), Am Hubland, Universität Würzburg, D-97074 Würzburg, Germany
Institute for Topological Insulators, Am Hubland, Universität Würzburg, D-97074 Würzburg, Germany
II. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany
Funding
European Research Council · Deutsche Forschungsgemeinschaft · Japan Science and Technology Agency
References (50)
Show source-provided references
1. 10.1126/science.114804710.1126/science.1148047 ↗
2. 10.1103/RevModPhys.83.105710.1103/RevModPhys.83.1057 ↗
3. 10.1126/science.113373410.1126/science.1133734 ↗
4. 10.1038/nmat330510.1038/nmat3305 ↗
5. 10.1088/0034-4885/75/7/07650110.1088/0034-4885/75/7/076501 ↗
6. 10.1126/science.117473610.1126/science.1174736 ↗
7. 10.1038/nphys232210.1038/nphys2322 ↗
8. 10.1103/PhysRevLett.119.22640110.1103/PhysRevLett.119.226401 ↗
9. 10.1021/acs.nanolett.8b0140510.1021/acs.nanolett.8b01405 ↗
10. 10.1038/nnano.2016.15910.1038/nnano.2016.159 ↗
11. 10.1103/PhysRevX.7.02101110.1103/PhysRevX.7.021011 ↗
12. 10.1103/PhysRevLett.107.13660310.1103/PhysRevLett.107.136603 ↗
13. 10.1063/1.496747110.1063/1.4967471 ↗
14. 10.1103/PhysRevMaterials.4.10420110.1103/PhysRevMaterials.4.104201 ↗
15. 10.1126/science.aai814210.1126/science.aai8142 ↗
16. 10.1126/science.aan600310.1126/science.aan6003 ↗
17. 10.1103/PhysRevLett.124.07680210.1103/PhysRevLett.124.076802 ↗
18. 10.1103/PhysRevB.83.12540810.1103/PhysRevB.83.125408 ↗
19. 10.1103/PhysRevB.96.19510410.1103/PhysRevB.96.195104 ↗
20. 10.1103/PhysRevB.45.389410.1103/PhysRevB.45.3894 ↗
21. 10.1103/PhysRevLett.71.229210.1103/PhysRevLett.71.2292 ↗
22. 10.1103/PhysRevLett.93.19680110.1103/PhysRevLett.93.196801 ↗
23. 10.1103/PhysRevLett.98.16680610.1103/PhysRevLett.98.166806 ↗
24. 10.1103/PhysRevB.81.08532910.1103/PhysRevB.81.085329 ↗
25. 10.1103/PhysRevB.88.23540910.1103/PhysRevB.88.235409 ↗
26. 10.1103/PhysRevB.84.04531410.1103/PhysRevB.84.045314 ↗
27. 10.1038/ncomms278810.1038/ncomms2788 ↗
28. 10.1103/PhysRevLett.113.26660110.1103/PhysRevLett.113.266601 ↗
29. 10.1038/ncomms785410.1038/ncomms7854 ↗
30. 10.1103/PhysRevB.25.218510.1103/PhysRevB.25.2185 ↗
31. 10.1103/PhysRevB.38.937510.1103/PhysRevB.38.9375 ↗
32. 10.1016/j.ssc.2018.08.00710.1016/j.ssc.2018.08.007 ↗
33. 10.1038/nnano.2013.31210.1038/nnano.2013.312 ↗
34. 10.1103/PhysRevResearch.4.03321410.1103/PhysRevResearch.4.033214 ↗
35. 10.1103/PhysRevB.46.402610.1103/PhysRevB.46.4026 ↗
36. 10.1088/2515-7639/ab758210.1088/2515-7639/ab7582 ↗
37. 10.1103/PhysRevLett.72.293510.1103/PhysRevLett.72.2935 ↗
38. 10.1103/PhysRevB.67.20533210.1103/PhysRevB.67.205332 ↗
39. 10.1109/TNANO.2002.80682310.1109/TNANO.2002.806823 ↗
40. 10.1103/PhysRevB.49.822710.1103/PhysRevB.49.8227 ↗
41. 10.1103/PhysRevB.101.20520510.1103/PhysRevB.101.205205 ↗
42. 10.1103/PhysRevB.97.16540810.1103/PhysRevB.97.165408 ↗
43. 10.1038/s41567-019-0692-410.1038/s41567-019-0692-4 ↗
44. 10.1103/PhysRevResearch.2.01317110.1103/PhysRevResearch.2.013171 ↗
45. 10.1103/PhysRevB.104.12530410.1103/PhysRevB.104.125304 ↗
46. 10.1103/PhysRevB.90.11530910.1103/PhysRevB.90.115309 ↗
47. 10.1038/s41467-022-29815-210.1038/s41467-022-29815-2 ↗
48. 10.1103/PhysRevB.106.04541910.1103/PhysRevB.106.045419 ↗
49. 10.1103/PhysRevLett.118.04680110.1103/PhysRevLett.118.046801 ↗
50. 10.1038/s41567-020-0998-210.1038/s41567-020-0998-2 ↗