Work

Pair-density-wave phase of strongly interacting electrons on the triangular lattice: A variational Monte Carlo study

Year: 2025

Type: article

Abstract: A robust theory of the mechanism of pair density wave (PDW) superconductivity (i.e., where Cooper pairs have nonzero center of mass momentum) remains elusive. Here we explore the triangular lattice $t\text{\ensuremath{-}}J\text{\ensuremath{-}}V$ model, a low-energy effective theory derived from the strong-coupling limit of the Holstein-Hubbard model, by large-scale variational Monte Carlo simulations. When the electron density is sufficiently low, the favored ground state is an s-wave PDW, consistent with results obtained from previous studies in this limit. Additionally, a PDW ground state with nematic d-wave pairing emerges in the intermediate range of electron densities and phonon frequencies. For these s-wave and d-wave PDWs arising in states with spontaneous breaking of time-reversal and inversion symmetries, PDW formation derives from valley-polarization and intrapocket pairing.

Source: Physical review. B./Physical review. B

DOI: 10.1103/gvw1-xk98

Authors: Jiucai Wang, Wen Sun, Hao-Xin Wang, Zhaoyu Han, Steven A. Kivelson, Hong Yao

Institutions: Hangzhou Normal University, Tsinghua University, Stanford University

Language: English

Topic: Physics of Superconductivity and Magnetism

Subfield: Condensed Matter Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: U.S. Department of Energy, National Natural Science Foundation of China, Basic Energy Sciences