Please use this identifier to cite or link to this item: https://doi.org/10.1038/s42005-020-00417-y
Title: Ultrafast and anharmonic Rabi oscillations between non-Bloch bands
Authors: Lee, C.H. 
Longhi, S.
Issue Date: 2020
Publisher: Nature Research
Citation: Lee, C.H., Longhi, S. (2020). Ultrafast and anharmonic Rabi oscillations between non-Bloch bands. Communications Physics 3 (1) : 147. ScholarBank@NUS Repository. https://doi.org/10.1038/s42005-020-00417-y
Rights: Attribution 4.0 International
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. © 2020, The Author(s).
Source Title: Communications Physics
URI: https://scholarbank.nus.edu.sg/handle/10635/198118
ISSN: 2399-3650
DOI: 10.1038/s42005-020-00417-y
Rights: Attribution 4.0 International
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