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Failure of Conductance Quantization in Two-Dimensional Topological Insulators due to Nonmagnetic Impurities
- Source :
- Physical Review Letters, Physical review letters, 122 (2019): 016601-1–016601-6. doi:10.1103/PhysRevLett.122.016601, info:cnr-pdr/source/autori:Novelli P.; Taddei F.; Geim A.K.; Polini M./titolo:Failure of Conductance Quantization in Two-Dimensional Topological Insulators due to Nonmagnetic Impurities/doi:10.1103%2FPhysRevLett.122.016601/rivista:Physical review letters (Print)/anno:2019/pagina_da:016601-1/pagina_a:016601-6/intervallo_pagine:016601-1–016601-6/volume:122, Novelli, P, Taddei, F, Geim, A K & Polini, M 2019, ' Failure of Conductance Quantization in Two-Dimensional Topological Insulators due to Nonmagnetic Impurities ', Physical Review Letters, vol. 122, no. 1, 016601 . https://doi.org/10.1103/PhysRevLett.122.016601
- Publication Year :
- 2019
- Publisher :
- American Physical Society (APS), 2019.
-
Abstract
- Despite topological protection and the absence of magnetic impurities, two-dimensional topological insulators display quantized conductance only in surprisingly short channels, which can be as short as 100 nm for atomically thin materials. We show that the combined action of short-range nonmagnetic impurities located near the edges and on site electron-electron interactions effectively creates noncollinear magnetic scatterers, and, hence, results in strong backscattering. The mechanism causes deviations from quantization even at zero temperature and for a modest strength of electron-electron interactions. Our theory provides a straightforward conceptual framework to explain experimental results, especially those in atomically thin crystals, plagued with short-range edge disorder.<br />Comment: 8 pages, 9 figures, 5 appendices
- Subjects :
- Materials science
Condensed Matter - Mesoscale and Nanoscale Physics
Condensed matter physics
topological protection
FOS: Physical sciences
General Physics and Astronomy
Conductance
01 natural sciences
Quantization (physics)
National Graphene Institute
Impurity
Topological insulator
ResearchInstitutes_Networks_Beacons/national_graphene_institute
Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
0103 physical sciences
magnetic impurities
quantization
Zero temperature
010306 general physics
Subjects
Details
- ISSN :
- 10797114 and 00319007
- Volume :
- 122
- Database :
- OpenAIRE
- Journal :
- Physical Review Letters
- Accession number :
- edsair.doi.dedup.....f59bc38ec0b9e01baa83771ff6bc2f3d