Direct current in a stirred optical lattice

Abstract

We study how the energy dispersion of bosonic atoms loaded into an optical lattice becomes modified due to periodic circular stirring of the lattice to the second order in the strength of stirring. If the lattice breaks mirror symmetry, the bosonic atoms may acquire a nonzero group velocity at the center of the Brillouin zone and produce a nonzero direct current. This effect is similar to the circular photogalvanic effect in solid-state physics. It can be used to transport neutral bosonic atoms in an optical lattice over a given distance in an arbitrary direction. However, when the drive frequency is detuned to avoid resonant transitions with energy absorption, we argue that the induced current is not persistent, but transient. An experimental study of the induced current relaxation could give answers to perplexing questions about equilibrization in driven systems.

arXiv comment17 pages, 7 figures; Extensive revision

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Cited by in corpus (4)

• The Berry dipole photovoltaic demon and the thermodynamics of photo-current generation within the optical gap of metals
• The Fermi-Dirac staircase occupation of Floquet bands and current rectification inside the optical gap of metals: a rigorous perspective
• Magnetic parity violation and parity-time-reversal-symmetric magnets
• Ultra-critical Floquet Non-Fermi Liquid