Charge and heat current rectification by a double-dot system within the Coulomb blockade regime

Abstract

Nanoscale recti ers are known to have signi cant nanoelectronic and nanoheatronic applications. In the present work we theoretically analyze rectifying properties of a junction including a couple of quantum dots asymmetrically coupled to the electrodes. The charge and heat current recti cation in the system is controlled by the dots occupation numbers and interdot Coulomb interactions. We examine the dependencies of the recti cation ratio on the electron energy levels on the dots, on the intensity of electron-electron interactions, on the gate and bias voltages and on the thermal gradients applied across the system. It is shown that the considered double-dot system possesses signi cant potentialities as a common as well as a heat diode.

Non-equilibrium boundary driven quantum systems: models, methods and properties

“…For instance in (Purkayastha et al, 2016a) the authors considered coupled harmonic oscillators with quartic terms which, together with the breaking of reflection symmetry, turned the system into a rectifier. Interactions are significant also in the use of quantum dots as rectifiers, as shown for instance in (Kuo and Chang, 2010;Marcos-Vicioso et al, 2018;Michaelis et al, 2006;Pöltl et al, 2009;Scheibner et al, 2008;Sierra and Sánchez, 2014;Stopa, 2002;Svensson et al, 2013;Tang et al, 2018;Xue-Ou et al, 2008;Zimbovskaya, 2020). In (Schaller et al, 2016), the authors relied on collective effects such as configurational blockade to significantly enhance the rectification.…”

Fano effect in a thermally induced transport through a triple quantum dot within the Coulomb blockade regime

“…The rectification is especially well pronounced when the side dot is detached from dot 1 ( β = 0 ) and remains empty thus suppressing the alternative pathway for traveling electrons and quantum interference effects. In this case the triple dot is reduced to a double dot considered in the earlier work [23]. In general, the rectifying properties of the system are more distinct when Coulomb repulsions between dot 3 and dots included in the T-shaped portion of the triple dot con-siderably exceed the inter-dot coupling ( U ≫ β ) weakening the effect of quantum interference.…”

“…One observes that Coulomb interactions noticeably suppress the heat transfer through the considered system and may bring asymmetry into J versus ∆T curves which indicates heat current rectification. It was suggested in some earlier works [22,23,29,[58][59][60] that inter-dot Coulomb interactions may cause rectification of a heat current in a double QD. One may expect that the same could happen in the considered triple dot provided that Coulomb repulsion between dot 3 and dots 1 and 2 is sufficiently strong.…”

“…In the last two decades, transport properties of tailored nanoscale systems including single and/or multiple quantum dots (QD) are being intensively studied due to their fundamental and applied perspectives [1][2][3][4][5]. Advances in controlling and measurements of heat transferred through small systems [6][7][8] further intensified these studies which suggest new possibilities for manufacturing nanoscale devices such as heat-to-electric energy converters [9][10][11][12], cooling systems [2,3,13,14] and heat diods [15][16][17][18][19][20][21][22][23].…”

Transport through a correlated polar side-coupled quantum dot transistor in the presence of a magnetic field and dissipation

“…Among them, the bimolecular transistor (BMT) involving double QDs has generated significant attention 58 – 61 . The BMT is particularly interesting for it has a simple structure, and also for it enhances the transport and thermo-electrical properties in both the Kondo regime 62 , 63 and Coulomb blockade regime 64 . Furthermore, extensive investigations have also been carried on the some other phenomena such as the Quantum interference effect 65 and negative tunneling Magnetoresistance 66 .…”