Non-Hermitian physics of levitated nanoparticle array

Abstract

The ability to control levitated nanoparticles allows one to explore various fields of physics, including quantum optics, quantum metrology, and nonequilibrium physics. It has been recently demonstrated that the arrangement of two levitated nanoparticles naturally realizes the tunable nonreciprocal dipole-dipole interaction. Motivated by this development, we here propose and analyze an array of levitated nanoparticles as an ideal platform to study non-Hermitian physics in a highly controlled manner. We employ the non-Bloch band theory to determine the continuum bands of the proposed setup and investigate the non-Hermitian skin effect therein. In particular, we point out that the levitated nanoparticle array exhibits rich dynamical phases, including the dynamically unstable phase and the unconventional critical phase where the spectral singularity persists over a broad region of the controllable parameters. We also show that the long-range nature of the dipole-dipole interaction gives rise to the unique self-crossing point of the continuum band.

15 pages, 8 figures

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Cited by in corpus (6)

• Quantum theory of non-Hermitian optical binding between nanoparticles
• Optical Levitation of Arrays of Microspheres
• Measurement-induced phase transition in free bosons
• Hermitian and non-Hermitian topology in active matter
• Coherent control of levitated nanoparticles via dipole-dipole interaction
• Higher symmetry breaking and non-reciprocity in a driven-dissipative Dicke model