Ultrafast and Anharmonic Rabi Oscillations between Non-Bloch-Bands
- URL: http://arxiv.org/abs/2003.10763v3
- Date: Tue, 31 Mar 2020 11:10:40 GMT
- Title: Ultrafast and Anharmonic Rabi Oscillations between Non-Bloch-Bands
- Authors: Ching Hua Lee, Stefano Longhi
- Abstract summary: Rabi flopping between Bloch bands induced by a weak ac resonant field is a coherent effect involving interband transitions.
We consider the fundamental processes of emission/absorption of quanta and Rabi oscillations in non-Hermitian two-band lattices exhibiting unbalanced non-Hermitian skin effect.
- Score: 3.787008621816909
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Rabi flopping between Bloch bands induced by a weak ac resonant field is a
coherent effect involving interband transitions. Here we consider the
fundamental processes of emission/absorption of quanta and Rabi oscillations in
non-Hermitian two-band lattices exhibiting unbalanced non-Hermitian skin
effect, and unveil an unprecedented scenario of Rabi flopping. The effective
dipole moment of the transition - usually considered a bulk property - is
however strongly dependent on boundary conditions, being greatly enhanced with
increased Rabi frequency only when open boundaries are present. As the field
strength is increased, Rabi oscillations rapidly become anharmonic, and
transitions cease to be vertical in the energy-momentum plane until the system
enters into an unstable regime (complex quasi-energy spectrum) due to secular
amplification channels. Remaining stable even in the presence of complex
energies, Rabi oscillations provide a vivid illustration of how the competition
between non-Hermitian, non-local and Floquet influences can result in
significant enhancements of physically measurable quantities.
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