Mixed-valence insulators with neutral Fermi surfaces

被引：85

作者：

Chowdhury, Debanjan ^{[1
]}

Sodemann, Inti ^{[1
,2
]}

Senthil, T. ^{[1
]}

机构：

[1] MIT, Dept Phys, Cambridge, MA 02139 USA

[2] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany

来源：

NATURE COMMUNICATIONS | 2018年 / 9卷

关键词：

SPIN-LIQUID-STATE; HEAT; SMB6;

D O I：

10.1038/s41467-018-04163-2

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：

Samarium hexaboride is a classic three-dimensional mixed valence system with a high-temperature metallic phase that evolves into a paramagnetic charge insulator below 40 K. A number of recent experiments have suggested the possibility that the low-temperature insulating bulk hosts electrically neutral gapless fermionic excitations. Here we show that a possible ground state of strongly correlated mixed valence insulators-a composite exciton Fermi liquid-hosts a three dimensional Fermi surface of a neutral fermion, that we name the "composite exciton." We describe the mechanism responsible for the formation of such excitons, discuss the phenomenology of the composite exciton Fermi liquids and make comparison to experiments in SmB6.

引用

页数：7

共 61 条

[1] Kondo Breakdown in Topological Kondo Insulators [J].