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Dephasing with strings attached

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Moessner,  Roderich
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Citation

Castelnovo, C., Dykman, M. I., Smelyanskiy, V. N., Moessner, R., & Pryadko, L. P. (2018). Dephasing with strings attached. Physical Review B, 97(8): 085121. doi:10.1103/PhysRevB.97.085121.


Cite as: https://hdl.handle.net/21.11116/0000-0000-CFBE-2
Abstract
Motivated by the existence of mobile low-energy excitations like domain walls in one dimension (1D) 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.