期刊
PHYSICAL REVIEW LETTERS
卷 115, 期 23, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.115.236403
关键词
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资金
- EPSRC [EP/J017639/1, EP/K030094/1]
- EPSRC Centre for Cross-Disciplinary Approaches to Non-Equilibrium Systems (CANES) [EP/L015854/1]
- Thomas Young Center
- Engineering and Physical Sciences Research Council [EP/J017639/1, EP/K030094/1] Funding Source: researchfish
- EPSRC [EP/J017639/1, EP/K030094/1] Funding Source: UKRI
We explore the nonequilibrium response of Chern insulators. Focusing on the Haldane model, we study the dynamics induced by quantum quenches between topological and nontopological phases. A notable feature is that the Chern number, calculated for an infinite system, is unchanged under the dynamics following such a quench. However, in finite geometries, the initial and final Hamiltonians are distinguished by the presence or absence of edge modes. We study the edge excitations and describe their impact on the experimentally observable edge currents and magnetization. We show that, following a quantum quench, the edge currents relax towards new equilibrium values, and that there is light-cone spreading of the currents into the interior of the sample.
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