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Title: Criterion for Bosonic Superfluidity in an Optical Lattice

Abstract

We show that the current method of determining superfluidity in optical lattices based on a visibly sharp bosonic momentum distribution n(k) can be misleading, for even a normal Bose gas can have a similarly sharp n(k). We show that superfluidity in a homogeneous system can be detected from the so-called visibility (v) of n(k)--that v must be 1 within O(N{sup -2/3}), where N is the number of bosons. We also show that the T=0 visibility of trapped lattice bosons is far higher than what is obtained in some current experiments, suggesting strong temperature effects and that these states can be normal. These normal states allow one to explore the physics in the quantum critical region.

Authors:
; ; ;  [1]
  1. Department of Physics, Ohio State University, Columbus, Ohio 43210 (United States)
Publication Date:
OSTI Identifier:
20951321
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 98; Journal Issue: 18; Other Information: DOI: 10.1103/PhysRevLett.98.180404; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BOSE-EINSTEIN GAS; BOSONS; DISTRIBUTION; SUPERFLUIDITY; TEMPERATURE DEPENDENCE; TRAPPING

Citation Formats

Diener, Roberto B., Zhou Qi, Zhai Hui, and Ho, T.-L.. Criterion for Bosonic Superfluidity in an Optical Lattice. United States: N. p., 2007. Web. doi:10.1103/PHYSREVLETT.98.180404.
Diener, Roberto B., Zhou Qi, Zhai Hui, & Ho, T.-L.. Criterion for Bosonic Superfluidity in an Optical Lattice. United States. doi:10.1103/PHYSREVLETT.98.180404.
Diener, Roberto B., Zhou Qi, Zhai Hui, and Ho, T.-L.. Fri . "Criterion for Bosonic Superfluidity in an Optical Lattice". United States. doi:10.1103/PHYSREVLETT.98.180404.
@article{osti_20951321,
title = {Criterion for Bosonic Superfluidity in an Optical Lattice},
author = {Diener, Roberto B. and Zhou Qi and Zhai Hui and Ho, T.-L.},
abstractNote = {We show that the current method of determining superfluidity in optical lattices based on a visibly sharp bosonic momentum distribution n(k) can be misleading, for even a normal Bose gas can have a similarly sharp n(k). We show that superfluidity in a homogeneous system can be detected from the so-called visibility (v) of n(k)--that v must be 1 within O(N{sup -2/3}), where N is the number of bosons. We also show that the T=0 visibility of trapped lattice bosons is far higher than what is obtained in some current experiments, suggesting strong temperature effects and that these states can be normal. These normal states allow one to explore the physics in the quantum critical region.},
doi = {10.1103/PHYSREVLETT.98.180404},
journal = {Physical Review Letters},
number = 18,
volume = 98,
place = {United States},
year = {Fri May 04 00:00:00 EDT 2007},
month = {Fri May 04 00:00:00 EDT 2007}
}