Quantum quenches and competing orders

被引:16
作者
Fu, Wenbo [1 ]
Hung, Ling-Yan [1 ]
Sachdev, Subir [1 ,2 ]
机构
[1] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA
[2] Perimeter Inst Theoret Phys, Waterloo, ON N2L 2Y5, Canada
来源
PHYSICAL REVIEW B | 2014年 / 90卷 / 02期
基金
美国国家科学基金会;
关键词
SUPERCONDUCTIVITY; FLUCTUATIONS; CUPRATE;
D O I
10.1103/PhysRevB.90.024506
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We study the nonequilibrium dynamics of an electronic model of competition between an unconventional charge density wave (a bond density wave) and d-wave superconductivity. In a time-dependent Hartree-Fock+BCS approximation, the dynamics reduces to the equations of motion of operators realizing the generators of SU(4) at each pair of momenta, (k, -k), in the Brillouin zone. We also study the nonequilibrium dynamics of a quantum generalization of a O(6) nonlinear sigma model of competing orders in the underdoped cuprates [Hayward et al., Science 343, 1336 (2014)]. We obtain results, in the large N limit of a O(N) model, on the time dependence of correlation functions following a pulse disturbance. We compare our numerical studies with recent picosecond optical experiments. We find that, generically, the oscillatory responses in our models share various qualitative features with the experiments.
引用
收藏
页数:20
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