Repulsively bound exciton-biexciton states in high-spin fermions in optical lattices

A. Argüelles and L. Santos
Phys. Rev. A 83, 033624 – Published 25 March 2011

Abstract

We show that the interplay between spin-changing collisions and quadratic Zeeman coupling provides a mechanism for the formation of repulsively bound composites in high-spin fermions, which we illustrate by considering spin flips in an initially polarized hard-core one-dimensional Mott insulator of spin-3/2 fermions. We show that after the flips the dynamics is characterized by the creation of two types of exciton-biexciton composites. We analyze the conditions for the existence of these bound states and discuss their intriguing properties. In particular we show that the effective mass and stability of the composites depends nontrivially on spin-changing collisions, on the quadratic Zeeman effect, and on the initial exciton localization. Finally, we show that the composites may remain stable against inelastic collisions, opening the possibility of interesting quantum composite phases.

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  • Received 8 November 2010

DOI:https://doi.org/10.1103/PhysRevA.83.033624

©2011 American Physical Society

Authors & Affiliations

A. Argüelles and L. Santos

  • Institut für Theoretische Physik, Leibniz Universität Hannover, Appelstrasse 2, D-30167 Hannover, Germany

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Issue

Vol. 83, Iss. 3 — March 2011

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