Conductance and Kondo Interference beyond Proportional Coupling

Author(s)

Dias da Silva, Luis G. G. V. ; Lewenkopf, Caio H. ; Vernek, Edson ; Ferreira, Gerson J. ; Ulloa, Sergio E.

• Document type: Journal article
• Source: Physical Review Letters; v. 119, n. 11 SEP 12 2017.
• Web of Science Citations: 8

Abstract

The transport properties of nanostructured systems are deeply affected by the geometry of the effective connections to metallic leads. In this work we derive a conductance expression for a class of interacting systems whose connectivity geometries do not meet the Meir-Wingreen proportional coupling condition. As an interesting application, we consider a quantum dot connected coherently to tunable electronic cavity modes. The structure is shown to exhibit a well-defined Kondo effect over a wide range of coupling strengths between the two subsystems. In agreement with recent experimental results, the calculated conductance curves exhibit strong modulations and asymmetric behavior as different cavity modes are swept through the Fermi level. These conductance modulations occur, however, while maintaining robust Kondo singlet correlations of the dot with the electronic reservoir, a direct consequence of the lopsided nature of the device. (AU)

• FAPESP's process: 16/18495-4 - Electronic transport and correlation effects in topological materials
• Grantee: Luis Gregório Godoy de Vasconcellos Dias da Silva
• Support Opportunities: Regular Research Grants