Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Coherently precessing spin and orbital states in superfluid He-3-B.
AU - Fisher, Shaun N.
AU - Suramlishvili, N.
PY - 2005/11
Y1 - 2005/11
N2 - 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.
AB - 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.
KW - LONG-LIVED INDUCTION SIGNAL
KW - MAGNETIC-FIELD
KW - B-PHASE
KW - DYNAMICS
KW - TEMPERATURES
KW - SUPERCURRENT
KW - REGIME
KW - DOMAIN
KW - WAVES
KW - MODES
U2 - 10.1007/s10909-005-8224-2
DO - 10.1007/s10909-005-8224-2
M3 - Journal article
VL - 141
SP - 111
EP - 141
JO - Journal of Low Temperature Physics
JF - Journal of Low Temperature Physics
SN - 0022-2291
IS - 3-4
ER -