TY - JOUR

T1 - Dynamical Scaling of Charge and Spin Responses at a Kondo Destruction Quantum Critical Point

AU - Cai, Ang

AU - Yu, Zuodong

AU - Hu, Haoyu

AU - Kirchner, Stefan Bernd

AU - Si, Qimiao

N1 - Publisher Copyright:
© 2020 American Physical Society.

PY - 2020/1/17

Y1 - 2020/1/17

N2 - Quantum critical points often arise in metals perched at the border of an antiferromagnetic order. The recent observation of singular and dynamically scaling charge conductivity in an antiferromagnetic quantum critical heavy fermion metal implicates beyond-Landau quantum criticality. Here we study the charge and spin dynamics of a Kondo destruction quantum critical point (QCP), as realized in an SU(2)-symmetric Bose-Fermi Kondo model. We find that the critical exponents and scaling functions of the spin and single-particle responses of the QCP in the SU(2) case are essentially the same as those of the large-N limit, showing that 1/N corrections are subleading. Building on this insight, we demonstrate that the charge responses at the Kondo destruction QCP are singular and obey ω/T scaling. This property persists at the Kondo destruction QCP of the SU(2)-symmetric Kondo lattice model.

AB - Quantum critical points often arise in metals perched at the border of an antiferromagnetic order. The recent observation of singular and dynamically scaling charge conductivity in an antiferromagnetic quantum critical heavy fermion metal implicates beyond-Landau quantum criticality. Here we study the charge and spin dynamics of a Kondo destruction quantum critical point (QCP), as realized in an SU(2)-symmetric Bose-Fermi Kondo model. We find that the critical exponents and scaling functions of the spin and single-particle responses of the QCP in the SU(2) case are essentially the same as those of the large-N limit, showing that 1/N corrections are subleading. Building on this insight, we demonstrate that the charge responses at the Kondo destruction QCP are singular and obey ω/T scaling. This property persists at the Kondo destruction QCP of the SU(2)-symmetric Kondo lattice model.

UR - http://www.scopus.com/inward/record.url?scp=85078660443&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.124.027205

DO - 10.1103/PhysRevLett.124.027205

M3 - Article

C2 - 32004044

AN - SCOPUS:85078660443

SN - 0031-9007

VL - 124

SP - 1

EP - 5

JO - Physical Review Letters

JF - Physical Review Letters

IS - 2

M1 - 027205

ER -