1,405 research outputs found
Interaction-induced anomalous transport behavior in one dimensional optical lattice
The non-equilibrium dynamics of spin impurity atoms in a strongly interacting
one-dimensional (1D) Bose gas under the gravity field is studied. We show that
due to the non-equilibrium preparation of the initial state as well as the
interaction between the impurity atoms and other bosons, a counterintuitive
phenomenon may emerge: the impurity atoms could propagate upwards automatically
in the gravity field . The effects of the strength of interaction, the gradient
of the gravity field, as well as the different configurations of the initial
state are investigated by studying the time-dependent evolution of the 1D
strongly interacting bosonic system using time-evolving block decimation (TEBD)
method. A profound connection between this counterintuitive phenomenon and the
repulsive bound pair is also revealed.Comment: 4.1 page
Floquet Majorana fermions in driven hexagonal lattice systems
We propose Floquet chiral topological superconducting systems hosting Floquet
Majorana fermions, which consist of hexagonal lattices in proximity to
superconductors with shining circularly polarized light. Specially for bilayer
graphene system, we demonstrate that there exist three topological phases
determined by certain parameters, namely, the amplitude and frequency of the
induced light. The number of chiral Floquet Majorana edge states is confirmed
by calculating Chern number analytically and energy spectrum in ribbon
geometry. Moreover, this proposal is generalized to other hexagonal lattice
systems, such as monolayer graphene and silicene. Notably, the parameter range
of induced light to achieve the chiral Floquet Majorana edge states is
experimentally feasible, and the corresponding Floquet Majorana fermions can be
probed based on differential conductance using scanning tunneling spectroscopy.Comment: 9 pages, 8 figure
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