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Competing Regimes of Motion of 1D Mobile Impurities

Schollwöck, U.
Published in Physical Review Letters. 2014, vol. 113, no. 7, p. 070601
Abstract 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.
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Research group Groupe Giamarchi
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KANTIAN, Adrian, SCHOLLWÖCK, U., GIAMARCHI, Thierry. Competing Regimes of Motion of 1D Mobile Impurities. In: Physical Review Letters, 2014, vol. 113, n° 7, p. 070601. https://archive-ouverte.unige.ch/unige:87812

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Deposited on : 2016-09-27

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