Anomalous Spin-Charge Separation in a Driven Hubbard System

Spin-charge separation (SCS) is a striking manifestation of strong correlations in low-dimensional quantum systems, whereby a fermion splits into separate spin and charge excitations that travel at different speeds. Here, we demonstrate that periodic driving enables control over SCS in a Hubbard sys...

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Bibliographic Details
Published in:Physical review letters 2020-11, Vol.125 (19), p.1-195301, Article 195301
Main Authors: Gao, Hongmin, Coulthard, Jonathan R., Jaksch, Dieter, Mur-Petit, Jordi
Format: Article
Language:English
Subjects:
Electrons
Fermions
Separation
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Summary:Spin-charge separation (SCS) is a striking manifestation of strong correlations in low-dimensional quantum systems, whereby a fermion splits into separate spin and charge excitations that travel at different speeds. Here, we demonstrate that periodic driving enables control over SCS in a Hubbard system near half filling. In one dimension, we predict analytically an exotic regime where charge travels slower than spin and can even become "frozen," in agreement with numerical calculations. In two dimensions, the driving slows both charge and spin and leads to complex interferences between single-particle and pair-hopping processes.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.125.195301