Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Fano-Rashba effect in thermoelectricity of a double quantum dot molecular junction | Liu et al. Nanoscale Research Letters 2011 6 618 http content 6 1 618 o Nanoscale Research Letters a SpringerOpen Journal NANO IDEA Open Access Fano-Rashba effect in thermoelectricity of a double quantum dot molecular junction YS Liu1 XK Hong1 JF Feng1 and XF Yang1 2 Abstract We examine the relation between the phase-coherent processes and spin-dependent thermoelectric effects in an Aharonov-Bohm AB interferometer with a Rashba quantum dot QD in each of its arm by using the Green s function formalism and equation of motion EOM technique. Due to the interplay between quantum destructive interference and Rashba spin-orbit interaction RSOI in each QD an asymmetrical transmission node splits into two spin-dependent asymmetrical transmission nodes in the transmission spectrum and as a consequence results in the enhancement of the spin-dependent thermoelectric effects near the spin-dependent asymmetrical transmission nodes. We also examine the evolution of spin-dependent thermoelectric effects from a symmetrical parallel geometry to a configuration in series. It is found that the spin-dependent thermoelectric effects can be enhanced by controlling the dot-electrode coupling strength. The simple analytical expressions are also derived to support our numerical results. PACS numbers Keywords Rashba spin-orbit interaction Aharonov-Bohm interferometer Quantum dots Fano effects Introduction With the fast development and improvement of experimental techniques 1-9 much important physical properties in QD molecules such as electronic structures electronic transport and thermoelectric effects et al have widely attracted academic attention 10-29 . QDs can be realized by etching a two-dimensional electron gas 2DEG below the surface of AlGaAs GaAs heterostructures or by an electrostatic potential. Confinement of particles in all three spatial directions results in the discrete energy levels such like an atom or a molecule. We can .
