Tunable multistability and nonuniform phases in a dimerized two-dimensional Rydberg lattice  

作　　者：Han-Xiao Zhang Chu-Hui Fan Cui-Li Cui Jin-Hui Wu 张焓笑;范楚辉;崔淬砺;吴金辉(Center for Quantum Sciences,Northeast Normal University,Changchun 130117,China;College of Physics,Jilin University,Changchun 130012,China)

机构地区：[1]Center for Quantum Sciences,Northeast Normal University,Changchun 130117,China [2]College of Physics,Jilin University,Changchun 130012,China

出　　处：《Chinese Physics B》2020年第1期235-240,共6页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.11534002 and 11674049)

摘　　要：We study the multistability of fixed points for a dimerized system of Rydberg atoms driven by two laser fields and trapped in a two-dimensional(2D)square lattice.For identical driving fields,the fixed points of this system exhibit stable uniform,unstable uniform,stable nonuniform,or oscillating nonuniform phases in the presence of a bistable region.For different driving fields,however,all(stable,unstable,or oscillating)phases become nonuniform instead,which then results in two islets isolated from the mainland of Rydberg excitation.We also show that a tristable region may stretch out from the(nonuniform)bistable region near the islets,indicating that a richer phase diagram can be attained by tuning the Rabi frequencies and/or detunings of the driving fields.Last but not least,the fixed points can adiabatically evolve from the islets to the mainland but can not inversely evolve from the mainland to the islets.We study the multistability of fixed points for a dimerized system of Rydberg atoms driven by two laser fields and trapped in a two-dimensional(2D) square lattice. For identical driving fields, the fixed points of this system exhibit stable uniform, unstable uniform, stable nonuniform, or oscillating nonuniform phases in the presence of a bistable region. For different driving fields, however, all(stable, unstable, or oscillating) phases become nonuniform instead, which then results in two islets isolated from the mainland of Rydberg excitation. We also show that a tristable region may stretch out from the(nonuniform) bistable region near the islets, indicating that a richer phase diagram can be attained by tuning the Rabi frequencies and/or detunings of the driving fields. Last but not least, the fixed points can adiabatically evolve from the islets to the mainland but can not inversely evolve from the mainland to the islets.

关 键 词：Rydberg atoms dimerized system fixed point nonuniform phase 

分 类 号：TN249[电子电信—物理电子学] O562[理学—原子与分子物理]