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Title: Light cone dynamics in excitonic states of two-component Bose and Fermi gases

Journal Article · · Journal of Statistical Mechanics
 [1];  [2];  [3]
  1. Univ. of Amsterdam (The Netherlands); Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Univ. of Amsterdam (The Netherlands)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)

Herein we consider the non-equilibrium dynamics of two-component one dimensional quantum gases in the limit of extreme population imbalance where the minority species has but a single particle. We consider the situation where the gas is prepared in a state with a single spatially localized exciton: the single particle of the minority species is spatially localized while the density of the majority species in the vicinity of the minority particle sees a depression. Remarkably, we are able to consider cases where the gas contains on the order of $$N$$ = 100 particles, comparable to that studied in experiments on cold atomic gases. We are able to do so by exploiting the integrability of the gas together with the observation that the excitonic state can be constructed through a simple superposition of exact eigenstates of the gas. The number of states in this superposition, rather than being exponentially large in the number of particles, scales linearly with $$N$$. We study the evolution of such spatially localized states in both strongly interacting Bose and Fermi gases. The behavior of the light cones when the interaction strength and density of the gas is varied can be understood from exact results for the spin excitation spectrum in these systems. We argue that the light cone in both cases exhibits scaling collapse. However unique to the Bose gas, we show that the presence of gapped finite-momentum roton-like excitations provide the Bose gas dynamics with secondary light cones.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
European Union’s Horizon 2020; Foundation for Fundamental Research on Matter (FOM); The Dutch Research Council (NWO); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0012704
OSTI ID:
1614977
Report Number(s):
BNL--213835-2020-JAAM
Journal Information:
Journal of Statistical Mechanics, Journal Name: Journal of Statistical Mechanics Journal Issue: 1 Vol. 2020; ISSN 1742-5468
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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