Quasiparticle excitations in steady state transport across a correlated layer

Progress in Non-equilibrium Green's Functions

Dorda, Antonius^1 ; Titvinidze, Irakli^1 ; Arrigoni, Enrico^1

Institute of Theoretical and Computational Physics, Graz University of Technology, 8010Graz

8010, Austria^1

关键词: Current voltage curve;    Low-energy physics;    Nonzero temperature;    Quasiparticle excitations;    Single quantum dot;    Steady-state currents;    Steady-state transport;    Transport characteristics;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/696/1/012003/pdf
DOI  :  10.1088/1742-6596/696/1/012003

来源: IOP

【 摘 要 】

In this work we investigate the spectral and transport properties of a single correlated layer attached to two metallic leads, with particular focus on the low-energy physics. A steady state current is driven across the layer by applying a bias voltage between the leads. Extending previous work we introduce a nonzero temperature in the leads, which enables us to study the influence of quasiparticle excitations on the transport characteristics in detail. Even though the system is clearly three dimensional we obtain current-voltage curves that closely resemble those of single quantum dots. Furthermore, a splitting of the quasiparticle excitation with bias voltage is observed in the spectral function.