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arXiv · 1711.03068

Dephasing with strings attached

Claudio Castelnovo·Mark I. Dykman·Vadim N. Smelyanskiy·Roderich Moessner·Leonid P. Pryadko
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Abstract

Motivated by the existence of mobile low-energy excitations like domain walls in one dimension or gauge-charged fractionalized particles in higher dimensions, we compare quantum dynamics in the presence of weak Markovian dephasing for a particle hopping on a chain and for an Ising domain wall whose motion leaves behind a string of flipped spins. Exact solutions show that the two models have near identical transport responses in the bulk. On the other hand, in finite-length chains, the broadening of discrete spectral lines is much more noticeable in the case of a domain wall. These results may be of relevance to a broad class of systems including quasi-1D antiferromagnets, polymer chains, and even retinal systems.

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Claudio Castelnovo, Mark I. Dykman, Vadim N. Smelyanskiy, Roderich Moessner, Leonid P. Pryadko. 2017-11-08. Dephasing with strings attached. https://doi.org/10.1103/physrevb.97.085121

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