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Public Seminar of Physics RPg Student
posted by Department of Physics for HKU and Public
Event Type: Public Lecture/Forum/Seminar/Workshop/Conference/Symposium
Event Nature: Science & Technology

Event Details

Public Seminar of Physics RPg Student
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Quantum Spin Dynamics in a Spin-orbit Coupled Bose Gas

Mr. Wai Ho TANG

Abstract:

Spin-orbit coupling (SOC) has given rise to many novel features of physical systems, from single atom to solid materials. Since its recent experimental realisation in neutral atoms, many theoretical and experimental studies have revealed new phases and properties of Bose condensate with SOC. On the other hand, little attention has been paid to the effects of spin-orbit interaction in thermal Bose vapour with SOC. In this study, we derive transport equations governing the spin dynamics of a two-component Bose gas with SOC. The coupled dynamics of density and spin results in new features of spin dynamics. Analytic solution of spin helix in quasi-one-dimensional situation is obtained. In the adiabatic regime, persistent spin helix (PSH) protected by SU(2) symmetry is found. In the vicinity of PSH, the decay of transverse spin proceeds either parabolically or exponentially, depending on initial polarisation. By contrast, far away from adiabatic limit, transverse spin density and current oscillate in a way similar to the charge-current oscillation in LC circuit.

Anyone interested is welcome to attend.

Date/Time21/09/2017 14:15-14:45
VenueRm 518, 5/F, Chong Yuet Ming Physics Building, HKU
LanguageEnglish

Registration Instruction

Registration is not required.

Contact Information

Should you have any enquiries, please feel free to contact Ms Eva Wong by email at physdept@hku.hk or by phone at 2859 2360 or by fax at 2559 9152.