期刊
PHYSICAL REVIEW B
卷 88, 期 7, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.88.075104
关键词
-
资金
- DFG [FR 2627/3-1, SFB 608, FOR 960]
- EPSRC [EP/1032487/1]
- Engineering and Physical Sciences Research Council [EP/I032487/1] Funding Source: researchfish
- EPSRC [EP/I032487/1] Funding Source: UKRI
We investigate Kondo physics in a host with a strongly diverging density of states. This study is motivated by a recent work on vacancies in the graphene honeycomb lattice, whose density of states is enhanced at low energies due to potential scattering. The generalized quantum impurity model describing the vacancy is shown to support a spin-1/2 (doublet) Kondo phase. The special role played by a diverging host density of states is examined in detail, with distinctive signatures associated with the power law Kondo effect shown to appear in thermodynamic quantities and the scattering t matrix, with a strongly enhanced Kondo temperature. Although the effective Kondo model supports a stable phase characterized by strong renormalized particle-hole asymmetry, we find that this phase cannot in fact be accessed in the full Anderson model. In the more realistic case, where the divergence in the host density of states is cut off at low energies, a crossover is generated between pristine power law Kondo physics and a regular Kondo strong coupling state.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据