Topological space-time crystal
- URL: http://arxiv.org/abs/2201.03577v2
- Date: Thu, 5 May 2022 07:14:54 GMT
- Title: Topological space-time crystal
- Authors: Yang Peng
- Abstract summary: We introduce a new class of out-of-equilibrium noninteracting topological phases, the topological space-time crystals.
These are time-dependent quantum systems which do not have discrete spatial translation symmetries, but instead are invariant under discrete space-time translations.
- Score: 1.0152838128195467
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: We introduce a new class of out-of-equilibrium noninteracting topological
phases, the topological space-time crystals. These are time-dependent quantum
systems which do not have discrete spatial translation symmetries, but instead
are invariant under discrete space-time translations. Similar to the
Floquet-Bloch systems, the space-time crystals can be described by a
frequency-domain-enlarged Hamiltonian, which is used to classify topologically
distinct space-time crystals. We show that these space-time crystals can be
engineered from conventional crystals with an additional time-dependent drive
that behaves like a traveling wave moving across the crystal. Interestingly, we
are able to construct 1D and 2D examples of topological space-time crystals
based on tight-binding models which involve only one orbital, in contrast to
the two-orbital minimal models for any previous discovered static or Floquet
topological phases with crystalline structures.
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