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Quantum Walk in Degenerate Spin Environments
KTH, School of Engineering Sciences (SCI), Theoretical Physics. University of Massachusetts, United States; Kurchatov Institute, Russian Federation.
2016 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 116, no 24, 247202Article in journal (Refereed) PublishedText
Abstract [en]

We study the propagation of a hole in degenerate (paramagnetic) spin environments. This canonical problem has important connections to a number of physical systems, and is perfectly suited for experimental realization with ultracold atoms in an optical lattice. At the short-to-intermediate time scale that we can access using a stochastic-series-type numeric scheme, the propagation turns out to be distinctly nondiffusive with the probability distribution featuring minima in both space and time due to quantum interference, yet the motion is not ballistic, except at the beginning. We discuss possible scenarios for long-term evolution that could be explored with an unprecedented degree of detail in experiments with single-atom resolved imaging.

Place, publisher, year, edition, pages
American Physical Society , 2016. Vol. 116, no 24, 247202
Keyword [en]
Crystal lattices, Optical lattices, Probability distributions, Stochastic systems, Canonical problems, Experimental realizations, Physical systems, Quantum interference, Quantum walk, Space and time, Stochastic series, Ultracold atoms
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-189667DOI: 10.1103/PhysRevLett.116.247202ISI: 000377812700010PubMedID: 27367403ScopusID: 2-s2.0-84975518137OAI: oai:DiVA.org:kth-189667DiVA: diva2:949026
Funder
Wenner-Gren Foundations
Note

QC 20160715

Available from: 2016-07-15 Created: 2016-07-11 Last updated: 2016-07-15Bibliographically approved

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Prokofiev, Nikolay
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