Daniel Loss Monday, 11:15 - 11:45
Finite-temperature conductance of strongly interacting quantum wire with a nuclear spin order
We study the temperature dependence of the electrical conductance of
a clean strongly interacting quantum wire in the presence of a
helical nuclear spin order [1]. The nuclear spin helix opens a
temperature-dependent partial gap in the electron spectrum. Using a
bosonization framework we describe the gapped electron modes by
sine-Gordon-like kinks. We predict an internal resistivity caused by
an Ohmic-like friction these kinks experience via interacting with
gapless excitations. As a result, the conductance rises from G=e2/h
at temperatures below the critical temperature when nuclear spins are
fully polarized to G=2e2/h at higher temperatures when the order is
destroyed, featuring a relatively wide plateau in the intermediate
regime. The theoretical results are compared with the experimental
data for GaAs quantum wires obtained recently by Scheller et al.
[Phys. Rev. Lett. 112, 066801 (2014)].

[1] Pavel Aseev, Jelena Klinovaja, and Daniel Loss, Phys. Rev. B 95,
125440 (2017).