Quantum phase transition in a two-dimensional Kondo-Heisenberg model: A dynamical Schwinger-boson large-N approach

被引：18

作者：

Wang, Jiangfan ^{[1
]}

Chang, Yung-Yeh ^{[1
]}

Mou, Chung-Yu ^{[2
,3
]}

Kirchner, Stefan ^{[4
,5
,6
]}

Chung, Chung-Hou ^{[1
,7
]}

机构：

[1] Natl Chiao Tung Univ, Dept Electrophys, Hsinchu 30010, Taiwan

[2] Natl Tsing Hua Univ, Ctr Quantum Technol, Hsinchu 30013, Taiwan

[3] Natl Tsing Hua Univ, Dept Phys, Hsinchu 30013, Taiwan

[4] Zhejiang Univ, Zhejiang Inst Modern Phys, Hangzhou 310027, Peoples R China

[5] Zhejiang Univ, Dept Phys, Hangzhou 310027, Peoples R China

[6] Zhejiang Univ, Zhejiang Prov Key Lab Quantum Technol & Device, Hangzhou 310027, Peoples R China

[7] Natl Ctr Theoret Sci, Phys Div, Hsinchu 30013, Taiwan

来源：

PHYSICAL REVIEW B | 2020年 / 102卷 / 11期

基金：

美国国家科学基金会;

关键词：

FLUCTUATIONS; TEMPERATURE; LATTICE;

D O I：

10.1103/PhysRevB.102.115133

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We generalize the dynamical large-N multichannel Schwinger-boson approach to study the quantum phase transition of a two-dimensional Kondo-Heisenberg model, relevant for heavy electron systems, close to an antiferromagnetic Kondo destruction quantum critical point. By breaking up a Kondo singlet into a charge fermion (holon) and a bosonic spinon, we identify and characterize the quantum phase transition from an antiferromagnetically ordered state to a Kondo-dominated paramagnetic state, and attribute a jump in the holon phase shift to Kondo breakdown. We calculate transport and thermodynamic quantities. The global finite-temperature phase diagram and the critical behavior of various physical observables therein show a close resemblance to experimental observations.

引用

页数：17