Two-hole ground state wavefunction: Non-BCS pairing in a t−J two-leg ladder
Author(s)
Chen, Shuai; Zhu, Zheng; Weng, Zheng-Yu
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Superconductivity is usually described in the framework of the Bardeen-Cooper-Schrieffer (BCS) wavefunction, which even includes the resonating-valence-bond (RVB) wavefunction proposed for the high-temperature superconductivity in the cuprate. A natural question is if any fundamental physics could be possibly missed by applying such a scheme to strongly correlated systems. Here we study the pairing wavefunction of two holes injected into a Mott insulator/antiferromagnet in a two-leg ladder using variational Monte Carlo approach. By comparing with density-matrix renormalization group (DMRG) calculation, we show that a conventional BCS or RVB pairing of the doped holes makes qualitatively wrong predictions and is incompatible with the fundamental pairing force in the t-J model, which is kinetic-energy driven by nature. By contrast, a non-BCS-like wavefunction incorporating such novel effect will result in a substantially enhanced pairing strength and improved ground state energy as compared to the DMRG results. We argue that the non-BCS form of such a new ground state wavefunction is essential to describe a doped Mott antiferromagnet at finite doping.
Date issued
2018-12Department
Massachusetts Institute of Technology. Department of PhysicsJournal
Physical Review B
Publisher
American Physical Society
Citation
Chen, Shuai, et al. “Two-Hole Ground State Wavefunction: Non-BCS Pairing in a t−J Two-Leg Ladder.” Physical Review B, vol. 98, no. 24, Dec. 2018. © 2018 American Physical Society
Version: Final published version
ISSN
2469-9950
2469-9969