Coherent control of spin tunneling in a driven spin–orbit coupled bosonic triple well

Abstract

We investigate the coherent control of spin tunneling for a spin-orbit (SO) coupled boson trapped in a driven triple well. In the high-frequency limit, the quasienergies of the system are obtained analytically and the fine energy band structures are shown. By regulating the driving parameters, we reveal that the directed spin-flipping or spin-conserving tunneling of an SO-coupled boson occurs along different pathways and in different directions. The analytical results are demonstrated by numerical simulations and good agreements are found. Further, an interesting scheme of quantum spin tunneling switch with or without spin-flipping is presented. The results may have potential applications in the design of spintronic devices.

Exact solutions for a spin-orbit coupled ultracold atom held in a driven double well

“…Synthetic SO coupling of both Bose and Fermi gases has been realized in recent experiments [29][30][31][32][33][34][35], which opens a completely new and ideal avenue for investigating quantum dynamics of SO-coupled cold atomic systems. There have been a great number of research works focusing on novel dynamics of SO-coupled cold atomic systems , for instance, quantum spin dynamics [38,39], spin Josephson dynamics [41][42][43][44] and localization [45,46], Anderson transition of SO-coupled cold atoms [47], collective dynamics [32,48], Bloch oscillation dynamics [50], selective coherent spin transportation [55], spin-dependent dynamic localization [58], controlling stable spin dynamics [59], transparent manipulation of spin dynamics [62], coherent control of spin tunneling [63], and so on. To our knowledge, many works related to the quantum dynamics of SO-coupled cold atomic systems have been studied by applying approximate methods [43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59][6...…”