4.6 Article

Chiral Current Circulation and PT Symmetry in a Trimer of Oscillators

期刊

ACS PHOTONICS
卷 7, 期 12, 页码 5401-5414

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.0c01208

关键词

nonreciprocity; non-Hermitian physics; exceptional points; quantum transport; quantum optics; open quantum systems

资金

  1. Juan de la Cierva program (MINECO, Spain)
  2. Royal Society University Research Fellowship [URF/R1/201158]
  3. Spanish MINECO [MAT2017-88358-C3-I-R]
  4. Arago'n government through the project Q-MAD

向作者/读者索取更多资源

We present a simple quantum theory of a bosonic trimer in a triangular configuration, subject to gain and loss in an open quantum systems approach. Importantly, the coupling constants between each oscillator are augmented by complex arguments, which give rise to various asymmetries. In particular, one may tune the complex phases to induce chiral currents, including the special case of completely unidirectional (or one-way) circulation when certain conditions are met regarding the coherent and incoherent couplings. 'When our general theory is recast into a specific non-Hermitian Hamiltonian, we find interesting features in the trimer population dynamics close to the exceptional points between phases of broken and unbroken PT symmetry. Our theoretical work provides perspectives for the experimental realization of chiral transport at the nanoscale in a variety of accessible nanophotonic and nanoplasmonic systems and paves the way for the potential actualization of nonreciprocal devices.

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