2018/02/28 by G. Gómez-Silva, P. A. Orellana, E. V. Anda · 13 citations
Materials Science · Physics and Astronomy · #Advanced Thermoelectric Materials and Devices #Condensed matter physics #Coulomb #Coulomb blockade #Density of states #Electron #Fermi energy #Fermi level #Physics #Quantum and electron transport phenomena #Quantum dot #Quantum mechanics #Seebeck coefficient #Strongly correlated material #Thermoelectric effect #Topological Materials and Phenomena #Van Hove singularity #cond-mat.mes-hall
paper · pdf · doi:10.1063/1.5019922
published in Journal of Applied Physics 123(8) (American Institute of Physics)
openalex publication_date 2018/02/28 · openalex created_date 2018/03/06 · arxiv created 2018/04/01 · arxiv updated 2018/04/03 · openalex updated_date 2026/08/05
In the present work, we investigate the thermoelectric properties of a T-shaped double quantum dot system coupled to two metallic leads incorporating the intra-dot Coulomb interaction. We explore the role of the interference effects and Coulomb blockade on the thermoelectric efficiency of the system in the linear and nonlinear regimes. We studied as well the effect of a Van-Hove singularity of the leads density of states (DOS) at the neighborhood of the Fermi energy, a situation that can be obtained using a carbon nanotube, a graphene nano-ribbon or other contacts with one-dimensional properties. The system is studied above the Kondo temperature. The Coulomb blockade of the electronic charges is studied using the Hubbard III approximation, which properly describes the transport properties of this regime. In the linear response, our results show an enhancement of the thermopower and the figure of merit of the system. For a nonlinear situation, we calculate the thermoelectric efficiency and power output, concluding that the T-shaped double quantum dot is an efficient thermoelectric device. Moreover, we demonstrate the great importance of the DOS Van-Hove singularity at the neighborhood of the Fermi energy to obtain a very significant increase in the thermoelectric efficiency of the system.