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Competing Regimes of Motion of 1D Mobile Impurities
DPMC-MaNEP, University of Geneva, 24 Quai Ernest-Ansermet, 1211 Geneva, Switzerland.
Department für Physik, LMU München, Theresienstrasse 37, 80333 München, Germany.
DPMC-MaNEP, University of Geneva, 24 Quai Ernest-Ansermet, 1211 Geneva, Switzerland.
2014 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 113, no 7Article in journal (Refereed) Published
Abstract [en]

We show that a distinguishable mobile impurity inside a one-dimensional many-body state at zero temperature generally does not behave like a quasiparticle. Instead, both the impurity dynamics as well as the ground state of the bath are fundamentally transformed by a diverging number of zero-energy excitations being generated, leading to what we call infrared-dominated (ID) dynamics. Combining analytics and density matrix renormalization group numerics, we provide a general formula for the power law governing ID dynamics at zero momentum, discuss a threshold beyond which quasiparticle dynamics may occur again, and study the competition between the ID and quasiparticle universality classes at larger impurity momenta.

Place, publisher, year, edition, pages
2014. Vol. 113, no 7
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-336277DOI: 10.1103/PhysRevLett.113.070601OAI: oai:DiVA.org:uu-336277DiVA, id: diva2:1165546
Available from: 2017-12-13 Created: 2017-12-13 Last updated: 2017-12-13

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Publisher's full textElectronic full texthttp://link.aps.org/doi/10.1103/PhysRevLett.113.070601

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