Shot noise and universal Fano factor as a characterization of strongly correlated metals

被引:0
作者
Wang, Yiming [1 ]
Setty, Chandan [1 ,2 ,3 ]
Sur, Shouvik [1 ]
Chen, Liyang [1 ]
Paschen, Silke [4 ]
Natelson, Douglas [1 ]
Si, Qimiao [1 ]
机构
[1] Rice Univ, Rice Ctr Quantum Mat, Dept Phys & Astron, Houston, TX 77005 USA
[2] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA
[3] US DOE, Ames Natl Lab, Ames, IA 50011 USA
[4] Vienna Univ Technol, Inst Solid State Phys, A-1040 Vienna, Austria
来源
PHYSICAL REVIEW RESEARCH | 2024年 / 6卷 / 04期
基金
欧洲研究理事会; 美国国家科学基金会; 奥地利科学基金会;
关键词
FERMI-SURFACE; ELECTRON; HEAVY; FLUCTUATIONS; CHARGE;
D O I
10.1103/PhysRevResearch.6.L042045
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Shot noise measures out-of-equilibrium current fluctuations and is a powerful tool to probe the nature of current-carrying excitations in quantum systems. Recent shot-noise measurements in the heavy-fermion strange metal YbRh2Si2 exhibit a strong suppression of the Fano factor (F)-the ratio of the current noise to the average current in the dc limit. This system is representative of metals in which electron correlations are extremely strong. Here we carry out the first theoretical study on the shot noise of diffusive metals in the regime of strong correlations. A Boltzmann-Langevin equation formulation is constructed in a quasiparticle description in the x/ presence of strong correlations. We find that F = 3/4 in such a correlation regime. Thus, we establish the aforementioned Fano factor as universal to Fermi liquids, and we show that the Fano factor suppression observed in experiments on YbRh2Si2 necessitates a loss of the quasiparticles. Our work opens the door to systematic theoretical studies of shot noise as a means of characterizing strongly correlated metallic phases and materials.
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页数:5
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