Pseudospin symmetry and new collective modes of the Hubbard model
Journal Article
·
· Physical Review Letters; (USA)
- IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, California 95120 (USA)
The Hubbard model possesses a SU(2) pseudospin symmetry, which contains the U(1) phase symmetry as a subgroup. The existence of such symmetry leads to interesting experimental consequences if the U(1) phase symmetry is spontaneously broken, i.e., if the ground state is superconducting. In this case, there must exist a pair of {ital massive} collective modes which together with the usual Goldstone mode form a triplet representation of the psuedospin group. These collective modes are collisionless and couple directly to external charge disturbances with wave number {pi} and can therefore be detected experimentally as sharp resonances.
- OSTI ID:
- 6720278
- Journal Information:
- Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 65:1; ISSN PRLTA; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656000 -- Condensed Matter Physics
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COLLECTIVE EXCITATIONS
DIAGRAMS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITATION
GOLDSTONE DIAGRAMS
GROUND STATES
HIGH-TC SUPERCONDUCTORS
LIE GROUPS
PHYSICAL PROPERTIES
RESONANCE
SU GROUPS
SU-2 GROUPS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
SYMMETRY BREAKING
SYMMETRY GROUPS
U GROUPS
U-1 GROUPS
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656000 -- Condensed Matter Physics
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COLLECTIVE EXCITATIONS
DIAGRAMS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITATION
GOLDSTONE DIAGRAMS
GROUND STATES
HIGH-TC SUPERCONDUCTORS
LIE GROUPS
PHYSICAL PROPERTIES
RESONANCE
SU GROUPS
SU-2 GROUPS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
SYMMETRY BREAKING
SYMMETRY GROUPS
U GROUPS
U-1 GROUPS