Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 72: Correlated Electrons: Frustrated Magnets - General 2
TT 72.5: Vortrag
Donnerstag, 23. März 2017, 16:00–16:15, HSZ 204
Quantum domain walls induce incommensurate supersolid phase on the anisotropic triangular lattice — •Xue-Feng Zhang1,2, Shijie Hu2, Axel Pelster2, and Sebastian Eggert2 — 1Max-Planck- Institute for the Physics of Complex Systems, 01187 Dresden, Germany — 2Physics Department and Research Center OPTIMAS, University of Kaiserslautern, 67663 Kaiserslautern, Germany
We investigate the extended hard-core Bose-Hubbard model on the triangular lattice as a function of spatial anisotropy with respect to both hopping and nearest-neighbor interaction strength [1]. At half filling the system can be tuned from decoupled one-dimensional chains to a two-dimensional solid phase with alternating density order by adjusting the anisotropic coupling. At intermediate anisotropy, however, frustration effects dominate and an incommensurate supersolid phase emerges, which is characterized by incommensurate density order as well as an anisotropic superfluid density. We demonstrate that this intermediate phase results from the proliferation of topological defects in the form of quantum bosonic domain walls. Accordingly, the structure factor has peaks at wave vectors, which are linearly related to the number of domain walls in a finite system in agreement with extensive quantum Monte Carlo simulations. We discuss possible connections with the supersolid behavior in the high-temperature superconducting striped phase.
[1] Phys. Rev. Lett. 117, 193201 (2016)