Disordered XYZ spin chain simulations using the spectrum bifurcation renormalization group

作者：Slagle Kevin^*; You Yi Zhuang; Xu Cenke

来源：Physical Review B, 2016, 94(1): 014205.

DOI：10.1103/PhysRevB.94.014205

We study the disordered XYZ spin chain using the recently developed spectrum bifurcation renormalization group [Y.-Z. You et al., Phys. Rev. B 93, 104205 (2016)] numerical method. With strong disorder, the phase diagram consists of three many-body localized (MBL) spin-glass phases. We argue that, with sufficiently strong disorder, these spin-glass phases are separated by marginally MBL critical lines. We examine the critical lines of this model by measuring the entanglement entropy and Edwards-Anderson spin-glass order parameter, and find that the critical lines are characterized by an effective central charge c' = ln 2. Our data also suggest continuously varying critical exponents along the critical lines. We also demonstrate how long-range mutual information [introduced in C.-M. Jian et al., arXiv:1508.07006] can distinguish these phases.

• 出版日期2016-7-15