Non-reciprocal population dynamics in a quantum trimer

被引:4
作者
Downing, C. A. [1 ]
Zueco, D. [2 ]
机构
[1] Univ Exeter, Dept Phys & Astron, Exeter EX4 4QL, Devon, England
[2] Univ Zaragoza, Inst Nanociencia & Mat Aragon INMA, CSIC, Zaragoza 50009, Spain
来源
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES | 2021年 / 477卷 / 2255期
关键词
chirality; non-reciprocity; two-level systems; open quantum systems; INTERACTING PHOTONS; MAGNETIC-FIELD; ELECTRONS; CURRENTS; MATTER; ATOMS; STATE;
D O I
10.1098/rspa.2021.0507
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
We study a quantum trimer of coupled two-level systems beyond the single-excitation sector, where the coherent coupling constants are ornamented by a complex phase. Accounting for losses and gain in an open quantum systems approach, we show how the mean populations of the states in the system crucially depend on the accumulated phase in the trimer. Namely, for non-trivial accumulated phases, the population dynamics and the steady states display remarkable non-reciprocal behaviour in both the singly and doubly excited manifolds. Furthermore, while the directionality of the resultant chiral current is primarily determined by the accumulated phase in the loop, the sign of the flow may also change depending on the coupling strength and the amount of gain in the system. This directionality paves the way for experimental studies of chiral currents at the nanoscale, where the phases of the complex hopping parameters are modulated by magnetic or synthetic magnetic fields.
引用
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页数:17
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