Random-walk topological transition revealed via electron counting

Random-walk topological transition revealed via electron counting
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DOI:
10.1103/physrevb.96.241404
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发表时间:
2017-12-08
期刊:
影响因子:
3.7
通讯作者:
Brandes, T.
Brandes, T.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Engelhardt, G.;Benito, M.;Brandes, T.

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The appearance of topological effects in systems exhibiting a nontrivial topological band structure strongly relies on the coherent wave nature of the equations of motion. Here, we reveal topological dynamics in a classical stochastic random walk version of the Su-Schrieffer-Heeger model with no relation to coherent wave dynamics. We explain that the commonly used topological invariant in the momentum space translates into an invariant in a counting-field space. This invariant gives rise to clear signatures of the topological phase in an associated escape time distribution.