Spin-charge separation and electron pairing instabilities in Hubbard nanoclusters
Electron charge and spin pairing instabilities in various cluster geometries for attractive and repulsive electrons are studied exactly under variation of interaction strength, electron doping and temperature. The exact diagonalization, level crossing degeneracies, spin-charge separation and separate condensation of paired electron charge and opposite spins yield intriguing insights into the origin of magnetism, ferroelectricity and superconductivity seen in inhomogeneous bulk nanomaterials and various phenomena in cold fermionic atoms in optical lattices. Phase diagrams resemble a number of inhomogeneous, coherent and incoherent nanoscale phases found recently in high-T{sub c} cuprates, manganites and multiferroic nanomaterials probed by scanning tunneling microscopy. Separate condensation of electron charge and spin degrees at various crossover temperatures offers a new route for superconductivity, different from the BCS scenario. The calculated phase diagrams resemble a number of inhomogeneous paired phases, superconductivity, ferromagnetism and ferroelectricity found in Nb and Co nanoparticles. The phase separation and electron pairing, monitored by electron doping and magnetic field surprisingly resemble incoherent electron pairing in the family of doped high-T{sub c} cuprates, ruthenocuprates, iron pnictides and spontaneous ferroelectricity in multiferroic materials.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE SC OFFICE OF SCIENCE (SC)
- DOE Contract Number:
- DE-AC02-98CH10886
- OSTI ID:
- 1040137
- Report Number(s):
- BNL-90392-2009-JA; ULTRD6; KC020401H; TRN: US1202319
- Journal Information:
- Ultramicroscopy, Vol. 109, Issue 8; Conference: 10th International Scanning Probe Microscopy Conference; Seattle, WA; 20090622 through 20090624; ISSN 0304-3991
- Country of Publication:
- United States
- Language:
- English
Similar Records
SISGR: Atom chip microscopy: A novel probe for strongly correlated materials
Possible Bose-condensated Behavior in a Quantum Phase Originating in a Collective Excitation in the Chemically and Optically Doped Mott-Hubbard System UO2+x