Charge-density waves versus superconductivity in the Holstein model with next-nearest-neighbor hopping

Journal Article · Wed Jul 01 04:00:00 EDT 1992 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.46.271· OSTI ID:7205739

Vekic, M; Noack, R M; White, S R ^[1]

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1. Department of Physics, University of California, Irvine, California 92717 (United States)

We present quantum Monte Carlo results for the two-dimensional Holstein model with next-nearest-neighbor hopping. The Peierls charge-density-wave (CDW) instability near half filling is significantly suppressed by the addition of the next-nearest-neighbor hopping, and the superconducting pairing in the {ital s}-wave channel is enhanced away from half filling. The quantum Monte Carlo results are compared with random-phase-approximation and Migdal-Eliashberg calculations. We estimate the critical temperature for the Peierls CDW transition using a finite-size Ising-like scaling relationship, and for the superconducting transition in an {ital s}-wave channel using a Kosterlitz-Thouless scaling analysis. We discuss the possible existence of an incommensurate CDW ordered state away from half filling.

• OSTI ID: 7205739
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 46:1; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

665411* -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COMPUTERIZED SIMULATION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
KOSTERLITZ-THOULESS THEORY
MATHEMATICAL MODELS
MONTE CARLO METHOD
PHYSICAL PROPERTIES
QUANTIZATION
SCALING
SIMULATION
STATISTICAL MODELS
SUPERCONDUCTIVITY
TWO-DIMENSIONAL CALCULATIONS