凝聚态物理
超导电性
塞贝克系数
热电效应
物理
约瑟夫森效应
双层石墨烯
石墨烯
材料科学
量子力学
作者
Lorenzo Bernazzani,Giampiero Marchegiani,Francesco Giazotto,Stefano Roddaro,Alessandro Braggio
出处
期刊:Physical review applied
[American Physical Society]
日期:2023-04-06
卷期号:19 (4)
被引量:5
标识
DOI:10.1103/physrevapplied.19.044017
摘要
We investigate the thermoelectric properties of a hybrid nanodevice composed of a two-dimensional carbon-based material and a superconductor. This system presents nonlinear bipolar thermoelectricity, as induced by the spontaneous breaking of the particle-hole (PH) symmetry in a tunnel junction between bilayer graphene (BLG) and a Bardeen-Cooper-Schrieffer superconductor. In this scheme, the nonlinear thermoelectric effect, predicted and observed in superconductor-insulator-${\mathrm{superconductor}}^{\ensuremath{'}}$ junctions, is not affected by the competitive effect of the Josephson coupling. From a fundamental perspective, the most intriguing feature of this effect is its bipolarity. The capability to open and control the BLG gap guarantees improved thermoelectric performances that reach up to 1 mV/K, regarding the Seebeck coefficient, and a power density of $1\phantom{\rule{0.2em}{0ex}}\mathrm{nW}/\text{\ensuremath{\mu}}{\mathrm{m}}^{2}$ for temperature gradients of tens of kelvin. Furthermore, the externally controlled gating can also dope the BLG, which is otherwise intrinsically PH symmetric, giving us the opportunity to investigate the bipolar thermoelectricity, even in the presence of the controlled suppression of the PH symmetry. The predicted robustness of this system could foster further experimental investigations and applications in the near future, thanks to the available nanofabrication techniques.
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