Dephasing with strings attached
Physical Review B
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Castelnovo, C., Dykman, M., Smelyanskiy, V., Moessner, R., & Pryadko, L. (2018). Dephasing with strings attached. Physical Review B, 97 (8)https://doi.org/10.1103/PhysRevB.97.085121
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.
External DOI: https://doi.org/10.1103/PhysRevB.97.085121
This record's URL: https://www.repository.cam.ac.uk/handle/1810/283453