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Universal conductance dips and fractional excitations in a two-subband quantum wire

Hsu, Chen-Hsuan and Ronetti, Flavio and Stano, Peter and Klinovaja, Jelena and Loss, Daniel. (2020) Universal conductance dips and fractional excitations in a two-subband quantum wire. Physical Review Research, 2 (4). 043208.

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Official URL: https://edoc.unibas.ch/80699/

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Abstract

We theoretically investigate a quasi-one-dimensional quantum wire, where the lowest two subbands are populated, in the presence of a helical magnetic field. We uncover a backscattering mechanism involving the helical magnetic field and Coulomb interaction between the electrons. The combination of these ingredients results in scattering resonances and partial gaps which give rise to nonstandard plateaus and conductance dips at certain electron densities. The positions and values of these dips are independent of material parameters, serving as direct transport signatures of this mechanism. Our theory applies to generic quasi-one-dimensional systems, including a Kondo lattice and a quantum wire subject to intrinsic or extrinsic spin-orbit coupling. Observation of the universal conductance dips would identify a strongly correlated fermion system hosting fractional excitations, resembling the fractional quantum Hall states.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretical Nano/Quantum Physics (Klinovaja)
UniBasel Contributors:Klinovaja, Jelena
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
e-ISSN:2643-1564
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:20 Apr 2021 15:32
Deposited On:20 Apr 2021 15:02

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