Gapless fermions and gauge fields in dielectrics
- 1 May 1989
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 39 (13), 8988-8999
- https://doi.org/10.1103/physrevb.39.8988
Abstract
To study the nonmagnetic dielectric state and Mott transitions we consider an example of a two-dimensional modified Hubbard model with a large number of colors. Low-energy excitations in this phase are fermionic excitations and Bose excitations described by gauge fields of the U(1) group. The transition into the metal state has little effect on the fermionic spectrum, but it results in the local U(1) symmetry being broken and fermions becoming able to transfer charge excitations. Apart from the half-filling, scalar Bose excitations also appear. Due to the presence of additional gauge fields the physical conductivity is determined by the lowest conductivity of the Fermi or Bose subsystems.Keywords
This publication has 19 references indexed in Scilit:
- EFFECTIVE ACTION OF A TWO-DIMENSIONAL ANTIFERROMAGNETInternational Journal of Modern Physics B, 1988
- Resonating valence bonds andd-wave superconductivityPhysical Review B, 1988
- Large-nlimit of the Heisenberg-Hubbard model: Implications for high-superconductorsPhysical Review B, 1988
- Superconductivity in heavy electron metalsCzechoslovak Journal of Physics, 1988
- Gauge theory of high-temperature superconductors and strongly correlated Fermi systemsPhysical Review B, 1988
- Resonating–valence-bond theory of phase transitions and superconductivity in-based compoundsPhysical Review Letters, 1987
- The Resonating Valence Bond State in La 2 CuO 4 and SuperconductivityScience, 1987
- Possible highT c superconductivity in the Ba?La?Cu?O systemZeitschrift für Physik B Condensed Matter, 1986
- Resonating valence bonds: A new kind of insulator?Materials Research Bulletin, 1973
- New Approach to the Theory of Superexchange InteractionsPhysical Review B, 1959