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Rashba coupling and magnetic order in correlated helical liquids | | Martin Hohenadler
; Fakher F. Assaad
; | | Date: |
3 Nov 2014 | | Abstract: | We study strongly correlated helical liquids with and without Rashba coupling
using quantum Monte Carlo simulations of the Kane-Mele model with a Hubbard
interaction at the edge. Independent of the Rashba coupling, we find that
interactions enhance spin correlations and suppress the spectral weight at the
Fermi level. For sufficiently strong interactions, a gap can be observed in the
single-particle spectral function. However, based on a finite-size scaling
analysis and theoretical arguments, we argue that this gap is closed by order
parameter fluctuations in the Luttinger liquid phase even at zero temperature,
and filled in by thermally induced kinks in the order parameter in the Mott
phase at finite temperatures. While the bosonization suggests an umklapp-driven
Mott transition only in the presence of Rashba coupling and hence an important
impact of the latter, our numerical results are almost unaffected by Rashba
coupling even at low temperatures. | | Source: | arXiv, 1411.0719 | | Services: | Forum | Review | PDF | Favorites | |
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