Extracting the Chern number from the dynamics of a Fermi gas: implementing a quantum Hall bar for cold atoms.
Phys Rev Lett
; 111(13): 135302, 2013 Sep 27.
Article
em En
| MEDLINE
| ID: mdl-24116789
ABSTRACT
We propose a scheme to measure the quantized Hall conductivity of an ultracold Fermi gas initially prepared in a topological Chern insulating phase and driven by a constant force. We show that the time evolution of the center of mass, after releasing the cloud, provides a direct and clear signature of the topologically invariant Chern number. We discuss the validity of this scheme, highlighting the importance of driving the system with a sufficiently strong force to displace the cloud over measurable distances while avoiding band-mixing effects. The unusual shapes of the driven atomic cloud are qualitatively discussed in terms of a semiclassical approach.
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MEDLINE
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En
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Phys Rev Lett
Ano de publicação:
2013
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Article
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Espanha
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EEUU
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ESTADOS UNIDOS
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ESTADOS UNIDOS DA AMERICA
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EUA
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UNITED STATES
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UNITED STATES OF AMERICA
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USA