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- Title
Ultrafast and anharmonic Rabi oscillations between non-Bloch bands.
- Authors
Lee, Ching Hua; Longhi, Stefano
- Abstract
Bloch band theory and bulk-boundary correspondence in non-Hermitian systems are attracting great attention in different areas of science. Interband transitions and Rabi flopping induced by emission or absorption of field quanta are fundamental and well-understood processes in Hermitian systems. However, they are challenged in a non-Hermitian system, where band theory is affected by system boundaries. Here we consider Rabi oscillations in non-Hermitian 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. Rabi oscillations become anharmonic and transitions cease to be vertical in the energy-momentum plane in systems with open boundaries. Remaining stable even in the presence of complex energies, Rabi oscillations provide a vivid illustration of how competition between non-Hermitian, non-local and Floquet effects can result in significant enhancements of physically measurable quantities. The bulk boundary effects of non-hermitian systems are a burgeoning area of interest with the potential to unveil new and interesting physics. Here, the authors investigate how the non-Hermitian skin effect can drastically affect the emission and absorption quanta and Rabi oscillations in a driven non-Hermitian two-level lattice, which is sustainable even the system possess gain or loss.
- Subjects
PICOSECOND pulses; ANHARMONIC oscillator; ENERGY-band theory of solids; ABSORPTION; RABI oscillations
- Publication
Communications Physics, 2020, Vol 3, Issue 1, pN.PAG
- ISSN
2399-3650
- Publication type
Article
- DOI
10.1038/s42005-020-00417-y