72 research outputs found
Quantum-Squeezing-Induced Point-Gap Topology and Skin Effect
We theoretically predict the squeezing-induced point-gap topology together
with a {\it symmetry-protected skin effect} in a one-dimensional
(1D) quadratic-bosonic system (QBS). Protected by a time-reversal symmetry,
such a topology is associated with a novel invariant (similar to
quantum spin-Hall insulators), which is fully capable of characterizing the
occurrence of skin effect. Focusing on zero energy, the
parameter regime of this skin effect in the phase diagram just corresponds to a
{\it real-gap and point-gap coexisted topological phase}. Moreover, this phase
associated with the {\it symmetry-protected skin effect} is
experimentally observable by detecting the steady-state power spectral density.
Our work is of fundamental interest in enriching non-Bloch topological physics
by introducing quantum squeezing, and has potential applications for the
engineering of symmetry-protected sensors based on the skin
effect.Comment: 6 pages, 4 figures + Supplemental Materia
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