Interaction effects in a microscopic quantum wire model with strong spin-orbit interaction

G. W. Winkler, M. Ganahl, D. Schuricht, H. G. Evertz, S. Andergassen

Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

Abstract

We investigate the effect of strong interactions on the spectral properties of quantum wires with strong Rashba spin-orbit (SO) interaction in a magnetic field, using a combination of matrix product state and bosonization techniques. Quantum wires with strong Rashba SO interaction and magnetic field exhibit a partial gap in one-half of the conducting modes. Such systems have attracted wide-spread experimental and theoretical attention due to their unusual physical properties, among which are spin-dependent transport, or a topological superconducting phase when under the proximity effect of an s-wave superconductor. As a microscopic model for the quantum wire we study an extended Hubbard model with SO interaction and Zeeman field. We obtain spin resolved spectral densities from the real-time evolution of excitations, and calculate the phase diagram. We find that interactions increase the pseudo gap at k = 0 and thus also enhance the Majorana-supporting phase and stabilize the helical spin order. Furthermore, we calculate the optical conductivity and compare it with the low energy spiral Luttinger liquid result, obtained from field theoretical calculations. With interactions, the optical conductivity is dominated by an excotic excitation of a bound soliton-antisoliton pair known as a breather state. We visualize the oscillating motion of the breather state, which could provide the route to their experimental detection in e.g. cold atom experiments.

Originalspracheenglisch
Aufsatznummer063009
FachzeitschriftNew Journal of Physics
Jahrgang19
Ausgabenummer6
DOIs
PublikationsstatusVeröffentlicht - 1 Jun 2017

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quantum wires
spin-orbit interactions
conductivity
interactions
magnetic fields
excitation
physical properties
solitary waves
routes
phase diagrams
conduction
products
liquids
atoms
energy

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    ASJC Scopus subject areas

    • !!Physics and Astronomy(all)

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    Interaction effects in a microscopic quantum wire model with strong spin-orbit interaction. / Winkler, G. W.; Ganahl, M.; Schuricht, D.; Evertz, H. G.; Andergassen, S.

    in: New Journal of Physics, Jahrgang 19, Nr. 6, 063009, 01.06.2017.

    Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

    Winkler, G. W. ; Ganahl, M. ; Schuricht, D. ; Evertz, H. G. ; Andergassen, S. / Interaction effects in a microscopic quantum wire model with strong spin-orbit interaction. in: New Journal of Physics. 2017 ; Jahrgang 19, Nr. 6.
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    AU - Andergassen, S.

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