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Pairing phase favored by magnetic frustration.
J Phys Condens Matter
December 2024
Instituto de Física-Universidade Federal de Mato Grosso do Sul, Campo Grande 79070-900, MS, Brazil.
The interplay between magnetic frustration and pairing is investigated by adopting a BCS-like pairing mechanism on the frustratedJ1-J2Ising model on the square lattice. The ground-state and thermal phase transitions of the model are analyzed using a fermionic formulation within a CMF method. In this approach, the lattice system is divided into identical clusters, where the intracluster dynamic is exactly solved, and the intercluster interactions are replaced by self-consistent mean fields.
View Article and Find Full Text PDFQuartet Superfluid in Two-Dimensional Mass-Imbalanced Fermi Mixtures.
Phys Rev Lett
November 2023
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
Quartet superfluid (QSF) is a distinct type of fermion superfluidity that exhibits high-order correlation beyond the conventional BCS pairing paradigm. In this Letter, we report the emergent QSF in 2D mass-imbalanced Fermi mixtures with two-body contact interactions. This is facilitated by the formation of a quartet bound state in vacuum that consists of a light atom and three heavy fermions.
View Article and Find Full Text PDFSuperconductivity in Te-Deficient ZrTe.
J Phys Chem C Nanomater Interfaces
March 2023
Universidade de São Paulo, Escola de Engenharia de Lorena, DEMAR, 12612-550 Lorena, Brazil.
We present structural, electrical, and thermoelectric potential measurements on high-quality single crystals of ZrTe grown from isothermal chemical vapor transport. These measurements show that the Te-deficient ZrTe, which forms the same structure as the nonsuperconducting ZrTe, is superconducting below 3.2 K.
View Article and Find Full Text PDFSolvable 3D Kondo Lattice Exhibiting Pair Density Wave, Odd-Frequency Pairing, and Order Fractionalization.
Phys Rev Lett
October 2022
Division of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, New York 11973-5000, USA.
The Kondo lattice model plays a key role in our understanding of quantum materials, but a lack of small parameters has posed a long-standing problem. We present a three-dimensional S=1/2 Kondo lattice model describing a spin liquid within an electron sea. Strong correlations in the spin liquid are treated exactly, enabling a controlled analytical approach.
View Article and Find Full Text PDFPrecision Many-Body Study of the Berezinskii-Kosterlitz-Thouless Transition and Temperature-Dependent Properties in the Two-Dimensional Fermi Gas.
Phys Rev Lett
August 2022
Center for Computational Quantum Physics, Flatiron Institute, New York, New York 10010, USA.
We perform large-scale, numerically exact calculations on the two-dimensional interacting Fermi gas with a contact attraction. Reaching much larger lattice sizes and lower temperatures than previously possible, we determine systematically the finite-temperature phase diagram of the Berezinskii-Kosterlitz-Thouless (BKT) transitions for interaction strengths ranging from BCS to crossover to BEC regimes. The evolutions of the pairing wave functions and the fermion and Cooper pair momentum distributions with temperature are accurately characterized.
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