Enhanced spin-dependent thermopower in a double-quantum-dot sandwiched between two-dimensional electron gases*

Abstract

We study the spin-dependent thermopower in a double-quantum-dot (DQD) embedded between the left and right two-dimensional electron gases (2DEGs) in doped quantum wells under an in-plane magnetic field. When the separation between the DQD is smaller than the Fermi wavelength in the 2DEGs, the asymmetry in the dots’ energy levels leads to pronounced quantum interference effects characterized by the Dicke line-shape of the conductance, which are sensitive to the properties of the 2DEGs. The magnitude of the thermopower, which denotes the generated voltage in response to an infinitesimal temperature difference between the two 2DEGs under vanishing charge current, will be obviously enhanced by the Dicke effect. The application of the in-plane magnetic field results in the polarization of the spin-up and spin-down conductances and thermopowers, and enables an efficient spin-filter device in addition to a tunable pure spin thermopower in the absence of its charge counterpart.

The Charge and Spin Thermoelectric Properties across Double Quantum Dots Serially Coupled to Ferromagnetic Leads: The Case of Parallel Magnetic Configuration

“…nc/4.0/ -http://creativecommons.org/licenses/by ( system can sustain a considerable temperature difference across the junction because of this property. Among all the candidates for low-dimensional thermoelectric materials, DQDs systems are recommended for their interesting thermoelectric properties due to their scalability and high degree of tunability [10][11][12]. Thus, DQDs have already paved their way to become underlying devices of spintronics not only because of beautiful physics emerging in those systems, but, more importantly, due to possible future applications and due to the possibility of manipulation of a single spin [13][14][15].…”

Editorial: Physical Model and Applications of High-Efficiency Electro-Optical Conversion Devices

“…In particular, electrochemical properties are very relevant to the efficiency of electro-optical conversion devices. It has been shown that impurity doping is an effective method of improving electrochemical performance [1][2][3][4]. An Al-doping ternary cathode material model based on first principles density functional theory is proposed to improve the electrochemical performance of the device (Gao et al).…”