Non-Hermitian physics of levitated nanoparticle array
Non-Hermitian physics of levitated nanoparticle array
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DOI：
10.1103/physrevresearch.5.033217
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发表时间：
2023-01
影响因子：
4.2
通讯作者：
Kazuki Yokomizo;Yuto Ashida
中科院分区：
文献类型：
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作者：
Kazuki Yokomizo;Yuto Ashida
控制悬浮纳米粒子的能力使人们能够探索物理学的各个领域，包括量子光学、量子计量学和非平衡物理。最近的研究表明，两个悬浮纳米粒子的排列自然实现了可调的非互易偶极-偶极相互作用。在这一发展的推动下，我们在这里提出并分析了一系列悬浮纳米粒子，作为以高度受控的方式研究非厄米物理的理想平台。我们使用非Bloch带理论来确定所提出的装置的连续带，并研究了其中的非厄米集肤效应。特别是，我们指出悬浮纳米粒子阵列表现出丰富的动力学相，包括动态不稳定相和非常规临界相，其中光谱奇异性在可控参数的较大范围内持续存在。我们还证明了偶极-偶极相互作用的长程性质导致了连续谱带的唯一自交叉点。
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.