Non-Hermitian skin effect in a spin-orbit-coupled Bose-Einstein condensate

Abstract

We study a Bose-Einstein condensate of ultracold atoms subject to a non-Hermitian spin-orbit coupling, where the system acquires non-Hermitian skin effect under the interplay of spin-orbit coupling and laser-induced atom loss. The presence of the non-Hermitian skin effect is confirmed through its key signatures in term of the spectral winding under the periodic boundary condition, the accumulation of eigen wavefunctions at boundaries under an open boundary condition, as well as bulk dynamics signaled by a directional flow. We show that the bulk dynamics in particular serves as a convenient signal for experimental detection. The impact of interaction and trapping potentials are also discussed based on non-Hermitian Gross-Pitaevskii equations. Our work demonstrates that the non-Hermitian skin effect and its rich implications in topology, dynamics and beyond are well within reach of current cold-atom experiments.

6 pages, 4 figures

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• Topological Origin of Non-Hermitian Skin Effects
• Spin-Injection Spectroscopy of a Spin-Orbit Coupled Fermi Gas
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Cited by in corpus (8)

• Topological Non-Hermitian skin effect
• Dimensional transmutation from non-Hermiticity
• Occupation-dependent particle separation in one-dimensional non-Hermitian lattices
• Non-Hermitian skin effect induced by Rashba-Dresselhaus spin-orbit coupling
• Geometry-dependent skin effect and anisotropic Bloch oscillations in a non-Hermitian optical lattice
• Modified Generalized-Brillouin-Zone Theory with On-site Disorders
• Optical pumping through the Liouvillian skin effect
• Imaginary spin-orbital coupling in parity-time symmetric systems with momentum-dependent gain and loss