Journal
PHYSICAL REVIEW B
Volume 91, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.91.235133
Keywords
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Funding
- National Science Foundation Graduate Research Fellowship Program [DGE-1247312]
- DARPA SPAWARSYSCEN Pacific [N66001-11-1-4110]
- DOE [DEF-06ER46316]
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Floquet topological insulators are noninteracting quantum systems that, when driven by a time-periodic field, are described by effective Hamiltonians whose bands carry nontrivial topological invariants. A longstanding question concerns the possibility of selectively populating one of these effective bands, thereby maximizing the system's resemblance to a static topological insulator. We study such Floquet systems coupled to a zero-temperature thermal reservoir that provides dissipation. We find that the resulting electronic steady states are generically characterized by a finite density of excitations above the effective ground state, even when the driving has a small amplitude and/or large frequency. We discuss the role of reservoir engineering in mitigating this problem.
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