Thermoelectric voltage switching in gold atomic wire junctions

Article

关键词: SINGLE-MOLECULE JUNCTIONS;    QUANTIZED CONDUCTANCE;    METALLIC CONTACTS;    ROOM-TEMPERATURE;    THERMOPOWER;    TRANSPORT;    NANOWIRES;   

DOI  :  10.1103/PhysRevB.98.115436

来源: SCIE

【 摘 要 】

We explore the thermoelectric properties of gold atomic chains bridging gold electrodes by means of ab initio and semiempirical calculations, and heuristic reasoning. We predict the thermoelectric voltage induced by a temperature difference across such junctions to oscillate, repeatedly changing sign, as a function of the number of atoms N making up the atomic chain. We also predict the amplitude of the oscillations to be proportional to N for long atomic chains. Further, we predict the thermoelectric voltage to change sign, in some cases, if the junction is stretched without changing N. Our predictions apply regardless of whether regular or irregular electrode grain boundaries are present and whether the electrodes are symmetric or asymmetric. Our findings may pave the way to the realization of new mechanically controllable voltage switches, enabling direct conversion of heat into electricity in energy harvesting applications.

【 授权许可】

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