Quantum metric and effective mass of a two-body bound state in a flat band

Tutkimustuotos: Lehtiartikkeli

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Quantum metric and effective mass of a two-body bound state in a flat band. / Törmä, Päivi; Liang, Long; Peotta, Sebastiano.

julkaisussa: Physical Review B, Vuosikerta 98, Nro 22, 220511, 26.12.2018, s. 1-5.

Tutkimustuotos: Lehtiartikkeli

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Bibtex - Lataa

@article{3d4c05135de44fd68d2e35dccbbadb46,
title = "Quantum metric and effective mass of a two-body bound state in a flat band",
abstract = "We consider two-body bound states in a flat band of a multiband system. The existence of pair dispersion predicts the possibility of breaking the degeneracy of the band and creating order, such as superconductivity. Within a separable interaction potential approximation, we find that the finiteness of the effective mass of a bound pair is determined by a band-structure invariant, which in the uniform case becomes the quantum metric. The results offer a simple foundation to understand and predict flat-band superconductivity. We propose an experiment to test the interaction-induced pair motion.",
keywords = "Condensed Matter - Superconductivity, Condensed Matter - Quantum Gases",
author = "P{\"a}ivi T{\"o}rm{\"a} and Long Liang and Sebastiano Peotta",
year = "2018",
month = "12",
day = "26",
doi = "10.1103/PhysRevB.98.220511",
language = "English",
volume = "98",
pages = "1--5",
journal = "Physical Review B (Condensed Matter and Materials Physics)",
issn = "2469-9950",
publisher = "American Physical Society",
number = "22",

}

RIS - Lataa

TY - JOUR

T1 - Quantum metric and effective mass of a two-body bound state in a flat band

AU - Törmä, Päivi

AU - Liang, Long

AU - Peotta, Sebastiano

PY - 2018/12/26

Y1 - 2018/12/26

N2 - We consider two-body bound states in a flat band of a multiband system. The existence of pair dispersion predicts the possibility of breaking the degeneracy of the band and creating order, such as superconductivity. Within a separable interaction potential approximation, we find that the finiteness of the effective mass of a bound pair is determined by a band-structure invariant, which in the uniform case becomes the quantum metric. The results offer a simple foundation to understand and predict flat-band superconductivity. We propose an experiment to test the interaction-induced pair motion.

AB - We consider two-body bound states in a flat band of a multiband system. The existence of pair dispersion predicts the possibility of breaking the degeneracy of the band and creating order, such as superconductivity. Within a separable interaction potential approximation, we find that the finiteness of the effective mass of a bound pair is determined by a band-structure invariant, which in the uniform case becomes the quantum metric. The results offer a simple foundation to understand and predict flat-band superconductivity. We propose an experiment to test the interaction-induced pair motion.

KW - Condensed Matter - Superconductivity

KW - Condensed Matter - Quantum Gases

U2 - 10.1103/PhysRevB.98.220511

DO - 10.1103/PhysRevB.98.220511

M3 - Article

VL - 98

SP - 1

EP - 5

JO - Physical Review B (Condensed Matter and Materials Physics)

JF - Physical Review B (Condensed Matter and Materials Physics)

SN - 2469-9950

IS - 22

M1 - 220511

ER -

ID: 30426800