半导体量子点分子-腔光机械耦合系统中光学双稳及多稳态的形成及调控  

Formation and control of optical bistable and multistable states in semiconductor quantum dot molecule-cavity optomechanical coupling systems

作　　者：曾莹 任波 徐名琪 杨红[1] 佘彦超 ZENG Ying;REN Bo;XU Ming-Qi;YANG Hong;SHE Yan-Chao(School of Physics and Mechatronics Engineering,Jishou University,Jishou 416000,China;Department of Physics and Electronic Engineering,Tongren University,Tongren 554300,China)

机构地区：[1]吉首大学物理与机电工程学院,吉首416000 [2]铜仁学院物理与电子工程系,铜仁554300

出　　处：《原子与分子物理学报》2025年第5期115-122,共8页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(12165016);贵州省科技厅基础研究项目(ZK[2023]049,ZK[2021]021,ZK[2022]558);铜仁市科技局科学技术基金(铜市科研(2023)41号)。

摘　　要：本研究探讨了外部磁场对半导体量子点分子与腔光机械耦合系统中光学双稳态行为的影响.研究结果显示,外部磁场、量子点之间的隧穿耦合以及探测光单光子的失谐可以有效地调控系统的光学双稳态.在弱隧穿和弱磁场条件下,系统的光学双稳态阈值和磁滞回线宽度随着外部磁场和点间隧穿耦合强度的增加而增大.随着磁场强度和隧穿耦合强度的进一步增加,系统的双稳态将演变为多稳态.有趣的是,在强隧穿和强磁场作用下,系统的光学双稳态阈值和磁滞回线宽度随着外部磁场和点间隧穿耦合强度的增加而减小.这种对耦合腔光机械系统中光学双稳态的灵活调控将在可控光开关方面具有潜在的广泛应用前景.This study investigates the opticalbistability behavior in a semiconductor quantum dot molecule coupled to cavity-optomechanical systems under the influence of an external magnetic field.The results indicate that the optical bistability of the system can be effectively controlled by the external magnetic field,inter-dot tunneling coupling,and the detuning of the probe light single-photon.Under weak tunneling and weak magnetic field conditions,the thresholds and hysteresis loop widths of the optical bistability increase with the enhancements of the external magnetic field and inter-dot tunneling coupling strength.Further increases in magnetic field intensity and tunneling coupling strength lead the system's bistable behavior to evolve into multistability.Interestingly,under strong tunneling and strong magnetic field conditions,the thresholds and hysteresis loop widths of the optical bistability decrease with the increasing external magnetic field and inter-dot tunneling coupling strength.The flexible control of optical bistability in this coupled cavity-optomechanical system holds promising applications in controllable optical switches.

关 键 词：双稳态 多稳态 点间隧穿耦合 光力耦合 

分 类 号：O437[机械工程—光学工程]