Controlling thermoelectric, heat, and energy currents through a quantum dot in sequential and cotunneling Coulomb-blockade regimes
arXiv:2112.15293 · doi:10.1016/j.physb.2021.413607
Abstract
Thermal transport through a Coulomb-blockade quantum dot (QD) coupled to two metallic leads is studied using five different approaches to the master equation in which sequential and coutuneling terms are taken into account. In the presence of intradot Coulomb interactions, a plateau in the thermo-particle, the heat, and the energy currents is seen. The current plateau diminishes at a high thermal bias between the leads. It is shown that the Pauli, the Redfield, the Lindblad-type equation with first order tunneling rates, and first-order von-Neumann master equations give very similar thermal transport indicating the conservation of coherency in the electron transport in sequential tunneling between the QD and leads. In contrast, the thermal transport is suppressed when coutuneling processes are taken into account via a second-order von-Neumann master equation. The consideration of second order effects with respect to the QD-leads coupling brings in a wealth of virtual processes at the contact to each lead. These virtual processes directly weaken the effects of the contribution of the first order direct processes to the overall transport, and introduce important other aspects of the transport, as level broadening, energy shifts, and lifetimes in the time-domain. As a result the current plateau formed via the Coulomb interaction diminishes, when second order and cotunneling processes are considered.
arXiv commentRevTeX - pdfLaTeX, 8 pages with 9 pdf-figures included
References in corpus (22)
- Kondo Physics in a Single Electron Transistor
- Tunneling through nanosystems: Combining broadening with many-particle states
- Heat Coulomb Blockade of One Ballistic Channel
- Coulomb blockade in an atomically thin quantum dot coupled to a tunable Fermi reservoir
- Cotunneling drag effect in Coulomb-coupled quantum dots
- Geometrical effects and signal delay in time-dependent transport at the nanoscale
- Time-dependent transport via the generalized master equation through a finite quantum wire with an embedded subsystem
- QmeQ 1.0: An open-source Python package for calculations of transport through quantum dot devices
- Modeling of cotunneling in quantum dot systems
- The effect of Coulomb interactions on nonlinear thermovoltage and thermocurrent in quantum dots
- Cavity-photon controlled thermoelectric transport through a quantum wire
- Efficient determination of the Markovian time-evolution towards a steady-state of a complex open quantum system
- Current correlations for the transport of interacting electrons through parallel quantum dots in a photon cavity
- Delocalization of electrons by cavity photons in transport through a quantum dot molecule
- Coupled collective and Rabi oscillations triggered by electron transport through a photon cavity
- Co-tunneling assisted sequential tunneling in multi-level quantum dots
- Cavity-photon contribution to the effective interaction of electrons in parallel quantum dots
- Thermoelectric Current and Coulomb-Blockade Plateaus in a Quantum Dot
- Effects of interdot hopping and Coulomb blockade on the thermoelectric properties of serially coupled quantum dots
- Regimes of radiative and nonradiative transitions in transport through an electronic system in a photon cavity reaching a steady state
- Transport in serial spinful multiple-dot systems: The role of electron-electron interactions and coherences
- Generalized Master Equation Approach to Time-Dependent Many-Body Transport