Fig. 3 Coupling matter to a ℤ2 gauge field in a two-leg ladder.

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Presentation transcript:

Fig. 3 Coupling matter to a ℤ2 gauge field in a two-leg ladder. Coupling matter to a ℤ2 gauge field in a two-leg ladder. (A) We consider the Hamiltonian (Eq. 24) describing a-particles that are minimally coupled to the ℤ2 gauge field τ^〈i,j〉yz on the rungs of a two-leg ladder. (B) The phase diagram, obtained by DMRG simulations at t∼yf/t∼xa=0.54, contains an SF-to-Mott transition in the charge sector at a commensurate density of the matter field, Na = Lx. In addition, we find a transition in the gauge sector, from an ordered region with a broken global ℤ2 symmetry where the ℤ2 magnetic field dominates and the vison excitations of the gauge field are gapped (red) to a disordered regime where the ℤ2 electric field is dominant and visons are strongly fluctuating in a condensed state (blue). Along the hatched lines at commensurate fillings Na/Lx = 1/2,1, 3/2, insulating CDW states could exist, but conclusive numerical results are difficult to obtain. (C) The conjectured schematic phase diagram of Eq. 24 is shown in the μ−t∼yf plane, where μ denotes the chemical potential for a^ particles and 2t∼yf corresponds to the energy cost per ℤ2 electric field line along a rung. Two scenarios are realized in different parameter regimes: In scenario I, the interplay of gauge and matter fields prevents a fully disordered Mott phase, whereas the latter exists in scenario II. The behavior in scenario I resembles the phase diagram of the more general 2D ℤ2 LGT (13, 26–28) sketched in (D). In our DMRG simulations here, as well as in the following figures, we keep up to 1400 DMRG states with five finite-size sweeps; the relative error on the energies is kept smaller than 10−7. Luca Barbiero et al. Sci Adv 2019;5:eaav7444 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).