Anomalous flux quantization in a hubbard ring with correlated hopping

Journal Article · Sat Jun 01 04:00:00 EDT 1996 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.76.4396· OSTI ID:285995

Arrachea, L; Aligia, A A; Gagliano, E ^[1]

---

1. Centro Atomico Bariloche and Instituto Balseiro, Comision Nacional de Energia Atomica, 8400 Bariloche (Argentina)

We solve exactly a generalized Hubbard ring with twisted boundary conditions. The magnitude of the nearest-neighbor hopping depends on the occupations of the sites involved and the term which modifies the number of doubly occupied sites {ital t}{sub {ital AB}}=0. Although {eta}-pairing state with off-diagonal long-range order are part of the degenerate ground state, the behavior of the energy as a function of the twist rules out superconductivity in this limit. A small {ital t}{sub {ital AB}} breaks the degeneracy and for moderate repulsive {ital U} introduce superconducting correlations which lead to {open_quote}{open_quote}anomalous{close_quote}{close_quote} flux quantization. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 285995
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 23 Vol. 76; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BOSONS
CORRELATIONS
ELECTRIC CONDUCTIVITY
FERMIONS
HUBBARD MODEL
MAGNETIC FLUX
RINGS
SUPERCONDUCTIVITY