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Suppressing backscattering of helical edge modes with a spin bath
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory. Radboud Univ Nijmegen, Inst Mol & Mat, Heijndaalseweg 135, NL-6525 AJ Nijmegen, Netherlands.
IMDEA Nanosci, Calle Faraday 9, E-28049 Madrid, Spain;Univ Manchester, Sch Phys & Astron, Manchester M13 9PY, Lancs, England.
Radboud Univ Nijmegen, Inst Mol & Mat, Heijndaalseweg 135, NL-6525 AJ Nijmegen, Netherlands.
2019 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 100, no 19, article id 195426Article in journal (Refereed) Published
Abstract [en]

We address the question of stability of protected helical edge states at the boundary of two-dimensional topological insulators upon interactions with the external bath. We study how backscattering amplitude changes when different interaction channels between the system and the environment are present. Drawing an analogy with the concept of pointer states in theory of open quantum systems, we demonstrate that in a certain regime the interplay between the Coulomb and the spin-spin interactions can make the backscattering process strictly irrelevant, and the helical modes become robust states with a well-defined momentum. This opens a possibility to use the external spin bath as a stabilizer that alleviates destructive effects and restores the helicity protection.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2019. Vol. 100, no 19, article id 195426
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-400017DOI: 10.1103/PhysRevB.100.195426ISI: 000498850400003OAI: oai:DiVA.org:uu-400017DiVA, id: diva2:1380279
Funder
EU, European Research Council, 338957 FEMTO/NANOAvailable from: 2019-12-18 Created: 2019-12-18 Last updated: 2019-12-18Bibliographically approved

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Bagrov, Andrey A.

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