Quantum Interference Enhancement of the Spin-Dependent Thermoelectric Response

被引：2

作者：

Bennett, Runa X. ^{[1
]}

Hendrickson, Joshua R. ^{[2
]}

Bergfield, Justin P. ^{[1
,3
]}

机构：

[1] Illinois State Univ, Dept Phys, Normal, IL 61790 USA

[2] Air Force Res Lab, Sensors Directorate, Dayton, OH 45433 USA

[3] Illinois State Univ, Dept Chem, Normal, IL 61790 USA

来源：

ACS NANO | 2024年 / 18卷 / 18期

基金：

美国国家科学基金会;

关键词：

quantum spin-thermopower; coherent transport; quantum interference; many-body transport theory; nonequilibrium Green's functions; single-moleculejunction; SINGLE-MOLECULE JUNCTIONS; ELECTRON-TRANSPORT; CHARGE-TRANSPORT; ORBITAL THEORY; HEAT; TRANSMISSION; THERMOPOWER; SIGNATURES; MODEL; MAGNETORESISTANCE;

D O I：

10.1021/acsnano.4c01297

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We investigate the influence of quantum interference (QI) and broken spin-symmetry on the thermoelectric response of node-possessing junctions, finding a dramatic enhancement of the spin-thermopower (S- s), figure-of-merit (Z( s) T), and maximum thermodynamic efficiency (eta s max) caused by destructive QI. Using many-body and single-particle methods, we calculate the response of 1,3-benzenedithiol and cross-conjugated molecule-based junctions subject to an applied magnetic field, finding nearly universal behavior over a range of junction parameters with S- s, Z( s) T, and reaching peak values of 2 pi root 3 ( k / e ) , 1.51, and 28% of Carnot efficiency, respectively. We also find that the quantum-enhanced spin-response is spectrally broad, and the field required to achieve peak efficiency scales with temperature. The influence of off-resonant thermal channels (e.g., phonon heat transport) on this effect is also investigated.

引用

页码：11876 / 11885

页数：10

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