Geometric Origin of Superfluidity in the Lieb-Lattice Flat Band

被引：257

作者：

Julku, Aleksi ^{[1
]}

Peotta, Sebastiano ^{[1
]}

Vanhala, Tuomas I. ^{[1
]}

Kim, Dong-Hee ^{[2
]}

Torma, Paivi ^{[1
]}

机构：

[1] Aalto Univ, Sch Sci, Dept Appl Phys, COMP Ctr Excellence, FI-00076 Aalto, Finland

[2] Gwangju Inst Sci & Technol, Sch Phys & Chem, Dept Phys & Photon Sci, Gwangju 61005, South Korea

来源：

PHYSICAL REVIEW LETTERS | 2016年 / 117卷 / 04期

基金：

新加坡国家研究基金会; 欧洲研究理事会; 芬兰科学院;

关键词：

HUBBARD-MODEL; DENSITY; FERROMAGNETISM; SUPERCONDUCTIVITY; TC;

D O I：

10.1103/PhysRevLett.117.045303

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The ground state and transport properties of the Lieb lattice flat band in the presence of an attractive Hubbard interaction are considered. It is shown that the superfluid weight can be large even for an isolated and strictly flat band. Moreover the superfluid weight is proportional to the interaction strength and to the quantum metric, a band structure quantity derived solely from the flat-band Bloch functions. These predictions are amenable to verification with ultracold gases and may explain the anomalous behavior of the superfluid weight of high-T-c superconductors.

引用

页数：6

共 69 条

[31] Gauge approach to superfluid density in underdoped cuprates [J].