Universal scaling of nonlinear conductance in the two-channel pseudogap Anderson model: Application for gate-tuned Kondo effect in magnetically doped graphene

被引：5

作者：

Lee, Tsung-Han ^{[1
]}

Zhang, Kenneth Yi-Jie ^{[1
]}

Chung, Chung-Hou ^{[1
,2
]}

Kirchner, Stefan ^{[3
,4
]}

机构：

[1] Natl Chiao Tung Univ, Dept Electrophys, Hsinchu 300, Taiwan

[2] Natl Ctr Theoret Sci, Hsinchu 300, Taiwan

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

[4] Max Planck Inst Chem Phys Fester Stoffe, D-01187 Dresden, Germany

来源：

PHYSICAL REVIEW B | 2013年 / 88卷 / 08期

关键词：

SCANNING TUNNELING SPECTROSCOPY; GAPLESS FERMI SYSTEMS; QUANTUM CRITICALITY; IMPURITIES; METALS; APPROXIMATION; SINGLE; FIELD;

D O I：

10.1103/PhysRevB.88.085431

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Based on the noncrossing approximation, we calculate both the linear and nonlinear conductance within the two-lead two-channel single-impurity Anderson model where the conduction electron density of states vanishes in a power-law fashion proportional to vertical bar omega - mu(F)vertical bar(r) with r = 1 near the Fermi energy, appropriate for a hexagonal system. For given gate voltage, we address the universal crossover from a two-channel Kondo phase, argued to occur in doped graphene, to an unscreened local moment phase. We extract universal scaling functions in conductance governing charge transfer through the two-channel pseudogap Kondo impurity and discuss our results in the context of a recent scanning tunneling spectroscopy experiment on Co-doped graphene.

引用

页数：7