Spin crossovers and superdiffusion in the one-dimensional Hubbard model
Spin crossovers and superdiffusion in the one-dimensional Hubbard model
复制标题
DOI：
10.1103/physrevb.102.115121
复制
发表时间：
2020-05
影响因子：
3.7
通讯作者：
Michele Fava;Brayden Ware;S. Gopalakrishnan;S. Gopalakrishnan;R. Vasseur;S. Parameswaran
中科院分区：
文献类型：
--
作者：
Michele Fava;Brayden Ware;S. Gopalakrishnan;S. Gopalakrishnan;R. Vasseur;S. Parameswaran
利用可积系统的广义流体力学框架，研究了一维Hubbard模型中的有限温度输运问题。在强耦合下，作者描述了自旋不相干状态下的传输-其中自旋自由度是“热”的，而电荷自由度是“冷”的-及其与Luttinger液体状态的交叉。此外，使用分析论证和数值模拟相结合，作者表明，当哈密顿量具有自旋或$\ensuremath{\eta}$-配对SU（2）对称性或两者兼而有之时，自旋或电荷输运是超扩散的Kardar-Parisi-Zhang标度。
Using the framework of generalized hydrodynamics for integrable systems, the authors study finite-temperature transport in the 1D Hubbard model. At strong coupling, the authors characterize transport in the spin-incoherent regime -- where spin degrees of freedom are ``hot'' while charge degrees of freedom are ``cold'' -- and its crossover to the Luttinger liquid regime. Furthermore, using a combination of analytical arguments and numerical simulations, the authors show that when the Hamiltonian features a spin or $\ensuremath{\eta}$-pairing SU(2) symmetry or both, spin or charge transport is superdiffusive with Kardar-Parisi-Zhang scaling.