Bad metallic transport in a cold atom Fermi-Hubbard system

被引：201

作者：

Brown, Peter T. ^{[1
]}

Mitra, Debayan ^{[1
]}

Guardado-Sanchez, Elmer ^{[1
]}

Nourafkan, Reza ^{[2
,3
]}

Reymbaut, Alexis ^{[2
,3
]}

Hebert, Charles-David ^{[2
,3
]}

Bergeron, Simon ^{[2
,3
]}

Tremblay, A. -M. S. ^{[2
,3
,4
]}

Kokalj, Jure ^{[5
,6
]}

Huse, David A. ^{[1
]}

Schauss, Peter ^{[1
,7
]}

Bakr, Waseem S. ^{[1
]}

机构：

[1] Princeton Univ, Dept Phys, Princeton, NJ 08544 USA

[2] Univ Sherbrooke, Dept Phys, Inst Quant, Sherbrooke, PQ J1K 2R1, Canada

[3] Univ Sherbrooke, Regrp Quebecois Mat Pointe, Sherbrooke, PQ J1K 2R1, Canada

[4] Canadian Inst Adv Res, Toronto, ON M5G 1Z8, Canada

[5] Univ Ljubljana, Fac Civil & Geodet Engn, SI-1000 Ljubljana, Slovenia

[6] Jozef Stefan Inst, Jamova 39, SI-1000 Ljubljana, Slovenia

[7] Univ Virginia, Dept Phys, Charlottesville, VA 22904 USA

来源：

SCIENCE | 2019年 / 363卷 / 6425期

基金：

加拿大自然科学与工程研究理事会;

关键词：

CONDUCTION;

D O I：

10.1126/science.aat4134

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Strong interactions in many-body quantum systems complicate the interpretation of charge transport in such materials. To shed light on this problem, we study transport in a clean quantum system: ultracold lithium-6 in a two-dimensional optical lattice, a testing ground for strong interaction physics in the Fermi-Hubbard model. We determine the diffusion constant by measuring the relaxation of an imposed density modulation and modeling its decay hydrodynamically. The diffusion constant is converted to a resistivity by using the Nernst-Einstein relation. That resistivity exhibits a linear temperature dependence and shows no evidence of saturation, two characteristic signatures of a bad metal. The techniques we developed in this study may be applied to measurements of other transport quantities, including the optical conductivity and thermopower.

引用

页码：379 / 382

页数：4

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