12,000

We have over 12,000 students, from over 100 countries, within one of the safest campuses in the UK

97%

97% of Lancaster students go into work or further study within six months of graduating

Home > Research > Publications & Outputs > Coherently precessing spin and orbital states i...
View graph of relations

« Back

Coherently precessing spin and orbital states in superfluid He-3-B.

Research output: Contribution to journalJournal article

Published

<mark>Journal publication date</mark>11/2005
<mark>Journal</mark>Journal of Low Temperature Physics
Issue3-4
Volume141
Number of pages31
Pages111-141
<mark>Original language</mark>English

Abstract

The Leggett equations for the spin dynamics of superfluid He-3 give a good description of the whole range of NMR phenomena observed at relatively high temperatures. However these equations assume that the orbital angular momentum of the condensate may only change on timescales much longer than the spin precession period. At the lowest achievable temperatures, the orbital viscosity of the B-phase of superfluid He-3 becomes vanishingly small, giving rise to the possibility of rapid orbital motion. We have reformulated Leggett's equations for the B-phase to allow for fast orbital dynamics in the absence of dissipation. The resulting non-linear equations of motion couple spin and orbital degrees of freedom resulting in qualitatively new phenomena. In particular, they allow for phase-locked precession of the spin and orbital angular momentum around an applied magnetic field. The coupled spin-orbit dynamics may eventually explain the exotic ultra long-lived NMR signals found at the lowest temperatures in He-3-B.