arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1802.04993cond-mat.mes-hallcond-mat.stat-mechcond-mat.str-elquant-ph
收藏

单弹道通道的热库仑阻塞

Heat Coulomb Blockade of One Ballistic Channel

E. Sivre, A. Anthore, F. D. Parmentier, A. Cavanna, U. Gennser, A. Ouerghi, Y. Jin, F. Pierre

摘要:

量子力学和库仑相互作用决定了小电路的行为。热的影响涵盖了从热的量子控制到量子热力学的基本主题,以及新型热机的前景和对纳米电路工程不可避免的日益增长的影响。在实验上,迄今为止罕见的观测包括普遍的热导量子和热干涉测量。然而,在量子线路中,为显着不同的热和电行为铺平道路的多体热效应的证据仍然缺乏。在这里,我们报告的观测库仑阻塞的电子热流从一个小的金属电路节点,超越了广泛的维德曼-弗兰兹定律的范例。我们证明了这种热多体现象完美的(弹道)传导通道的节点,在那里它相当于普遍抑制的正是一个量子的电导的热传输,但没有电。在整个热频率范围($\lesssim$温度$\times k_\mathrm{B}/h$)上,在浮置节点中,引起这种选择性热流减少的沟道间相关性来自局部电荷守恒。这一观察建立了纳米电路中热传输的量子定律的不同性质。

英文摘要:

Quantum mechanics and Coulomb interaction dictate the behavior of small circuits. The thermal implications cover fundamental topics from quantum control of heat to quantum thermodynamics, with prospects of novel thermal machines and an ineluctably growing influence on nanocircuit engineering. Experimentally, the rare observations thus far include the universal thermal conductance quantum and heat interferometry. However, evidences for many-body thermal effects paving the way to markedly different heat and electrical behaviors in quantum circuits remain wanting. Here we report on the observation of the Coulomb blockade of electronic heat flow from a small metallic circuit node, beyond the widespread Wiedemann-Franz law paradigm. We demonstrate this thermal many-body phenomenon for perfect (ballistic) conduction channels to the node, where it amounts to the universal suppression of precisely one quantum of conductance for the transport of heat, but none for electricity. The inter-channel correlations that give rise to such selective heat current reduction emerge from local charge conservation, in the floating node over the full thermal frequency range ($\lesssim$temperature$\times k_\mathrm{B}/h$). This observation establishes the different nature of the quantum laws for thermal transport in nanocircuits.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑