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Thomson and rotation effects during photothermal excitation process in magnetic semiconductor medium using variable thermal conductivity

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Applied Mathematics and Mechanics(English Edition) 2020年第6期41卷 909-926页

作者： K.LOTFY A.K.KHAMIS A.A.EL-BARY M.H.AHMED Department of Mathematics Faculty of ScienceZagazig UniversityZagazig 44519Egypt Department of Mathematics Faculty of ScienceTaibah UniversityAl-Madinah 30002Saudi Arabia Department of Mathematics Faculty of ScienceNorthern Border UniversityArar 91431Saudi Arabia Arab Academy for Science Technology and Maritime TransportAlexandria 1029Egypt

This study investigates a strong magnetic field acting over an elastic rotator semiconductor *** Thomson effect due to the magnetic field during the photothermal transport process is studied,and the thermoelectricity theory is used to explain the behavior of waves in the homogenous and isotropic medium under the effect of variable thermal *** variable thermal conductivity is considered as a linear function of the *** two-dimensional deformation equations are used to describe the overlaps among plasma,electrical,thermal,and magneto-elastic *** charge density of inertia-particles is considered as a function of time for studying the induced electric *** normal mode analysis is used to obtain the exact solutions of the physical field distributions as part of this *** obtain the complete solutions of the physical field quantities,the certain mechanical loads,electromagnetic effects,thermal effects,and plasma recombination process are applied *** results of the physical distributions are graphically depicted and discussed in consideration of the internal heat source,rotation,and peltier coefficient.

关键词： photothermal thermal conductivity Thomson effect rotation magnetic field peltier coefficient

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Nonlinear Seebeck and peltier effects in a Majorana nanowire coupled to leads

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Chinese Physics B 2024年第7期33卷 547-552页

作者：迟锋刘佳付振国刘黎明易子川 School of Electronic and Information Engineering UESTC of ChinaZhongshan InstituteZhongshan 528400China School of Science Inner Mongolia University of Science and TechnologyBaotou 014010China Institute of Applied Physics and Computational Mathematics Beijing 100088China

We theoretically study nonlinear thermoelectric transport through a topological superconductor nanowire hosting Majorana bound states(MBSs) at its two ends, a system named as Majorana nanowire(MNW). We consider that the MNW is coupled to the left and right normal metallic leads subjected to either bias voltage or temperature gradient. We focus our attention on the sign change of nonlinear Seebeck and peltier coefficients induced by mechanisms related to the MBSs, by which the possible existence of MBSs might be proved. Our results show that for a fixed temperature difference between the two leads, the sign of the nonlinear Seebeck coefficient(thermopower) can be reversed by changing the overlap amplitude between the MBSs or the system equilibrium temperature, which are similar to the cases in linear response regime. By optimizing the MBS–MBS interaction amplitude and system equilibrium temperature, we find that the temperature difference may also induce sign change of the nonlinear thermopower. For zero temperature difference and finite bias voltage, both the sign and magnitude of nonlinear peltier coefficient can be adjusted by changing the bias voltage or overlap amplitude between the MBSs. In the presence of both bias voltage and temperature difference, we show that the electrical current at zero Fermi level and the states induced by overlap between the MBSs keep unchanged, regardless of the amplitude of temperature difference. We also find that the direction of the heat current driven by bias voltage may be changed by weak temperature difference.

关键词： quantum dot nonlinear Seebeck coefficient peltier coefficient Majorana bound states sign change

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