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Breakdown of the Migdal-Eliashberg theory: A determinant quantum Monte Carlo study

Journal Article · · Physical Review B
 [1];  [2];  [2];  [3];  [4];  [5];  [6]
  1. Stanford Univ., CA (United States). Dept. of Physics
  2. Stanford Univ., CA (United States). Dept. of Physics; SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford Univ., CA (United States). Geballe Lab. for Advanced Materials
  5. Univ. of California, Santa Barbara, CA (United States). Dept. of Physics
  6. Stanford Univ., CA (United States). Dept. of Physics; Stanford Univ., CA (United States). Geballe Lab. for Advanced Materials

The superconducting (SC) and charge-density-wave (CDW) susceptibilities of the two-dimensional Holstein model are computed using determinant quantum Monte Carlo, and compared with results computed using the Migdal-Eliashberg (ME) approach. We access temperatures as low as 25 times less than the Fermi energy, EF, which are still above the SC transition. We find that the SC susceptibility at low T agrees quantitatively with the ME theory up to a dimensionless electron-phonon coupling λ0 ≈ 0.4 but deviates dramatically for larger λ0. We find that for large λ0 and small phonon frequency ω0 << EF CDW ordering is favored and the preferred CDW ordering vector is uncorrelated with any obvious feature of the Fermi surface.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR) (SC-21)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1436079
Alternate ID(s):
OSTI ID: 1430775
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 14 Vol. 97; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (13)

Physics of Superconducting Transition Temperatures journal November 2019
Antiadiabatic Phonons and Superconductivity in Eliashberg–McMillan Theory journal September 2019
Revealing fermionic quantum criticality from new Monte Carlo techniques journal August 2019
Cooper pairing of incoherent electrons: An electron-phonon version of the Sachdev-Ye-Kitaev model journal September 2019
Electronic and phononic properties of a two-dimensional electron gas coupled to dipolar phonons via small-momentum-transfer scattering journal December 2019
Enhancement of superconductivity by frustrating the charge order journal December 2019
Symmetry-enforced self-learning Monte Carlo method applied to the Holstein model journal July 2018
Competition of electron-phonon mediated superconductivity and Stoner magnetism on a flat band journal August 2018
Pseudogap crossover in the electron-phonon system journal May 2019
Phonon Dispersion and the Competition between Pairing and Charge Order journal May 2018
Competition of electron-phonon mediated superconductivity and Stoner magnetism on a flat band text January 2018
Physics of Superconducting Transition Temperatures preprint January 2019
Antiadiabatic Phonons and Superconductivity in Eliashberg-McMillan Theory text January 2019

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