Bloch-Landau-Zener oscillations in a quasi-periodic potential
Physical Review Research(2024)
摘要
Bloch oscillations and Landau-Zener tunneling are ubiquitous phenomena which
are sustained by a band-gap spectrum of a periodic Hamiltonian and can be
observed in dynamics of a quantum particle or a wavepacket in a periodic
potential under action of a linear force. Such physical setting remains
meaningful for aperiodic potentials too, although band-gap structure does not
exist anymore. Here we consider the dynamics of noninteracting atoms and
Bose-Einstein condensates in a quasi-periodic one-dimensional optical lattice
subjected to a weak linear force. Excited states with energies below the
mobility edge, and thus localized in space, are considered. We show that the
observed oscillatory behavior is enabled by tunneling between the initial state
and a state (or several states) located nearby in the coordinate-energy space.
The states involved in such Bloch-Landau-Zener oscillations are determined by
the selection rule consisting of the condition of their spatial proximity and
condition of quasi-resonances occurring at avoided crossings of the energy
levels. The latter condition is formulated mathematically using the Gershgorin
circle theorem. The effect of the inter-atomic interactions on the dynamics can
also be predicted on the bases of the developed theory. The reported results
can be observed in any physical system allowing for observation of the Bloch
oscillations, upon introducing incommensurablity in the governing Hamiltonian.
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