Discovery of an excited pair state in superfluid He-3

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Collective modes are the fingerprint of a condensed phase. The spectroscopy of these modes in superfluid He-3 and unconventional superconductors can provide key information on the symmetry of the condensate as well as the microscopic pairing mechanism responsible for the ground state and excitation energies. Here, we use interferometry within an acoustic cavity - which is very sensitive to changes in the velocity of transverse sound - to reveal a new collective mode in the B phase of superfluid He-3 (He-3-B). We identify the mode as an excited bound state of Cooper pairs, which is weakly bound with an excitation energy within 1% of the pair-breaking edge. On the basis of the selection rules for coupling of transverse sound to a collective mode in He-3-B, combined with the observation of acoustic birefringence near the collective mode frequency, we infer that the new mode is most likely a spin-triplet (S=1), f-wave pair exciton (orbital momentum L = 3) with total angular momentum, J = 4. The existence of a pair exciton with J = 4 suggests an attractive, subdominant, f-wave pairing interaction in liquid He-3.
Publisher
NATURE PUBLISHING GROUP
Issue Date
2008-07
Language
English
Article Type
Article
Keywords

STRONG MAGNETIC-FIELDS; ORDER-PARAMETER MODES; CHARGE-DENSITY WAVES; COLLECTIVE MODES; ZERO-SOUND; UNCONVENTIONAL SUPERCONDUCTORS; RESPONSE FUNCTIONS; TEMPERATURES; ATTENUATION; ENERGY

Citation

NATURE PHYSICS, v.4, no.7, pp.571 - 575

ISSN
1745-2473
DOI
10.1038/nphys969
URI
http://hdl.handle.net/10203/87851
Appears in Collection
PH-Journal Papers(저널논문)
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