Dynamic photon heat transport through a mesoscopic Josephson device biased by dc and ac voltages

作者：Lu, Wen-Ting; Zhao, Hong-Kang^*

来源：Annals of Physics, 2017, 385: 650-666.

DOI：10.1016/j.aop.2017.08.021

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Photon heat transport through a mesoscopic Josephson junction (MJJ) device under the perturbation of dc and ac voltages has been investigated, where the MJJ device is coupled to photon reservoirs, and the Caldeira-Leggett circuit theory has been used. The photon heat current and differential heat conductance have been evaluated to show the dynamic behaviors governed by the applied fields. The dc voltage V induces time t oscillating supercurrent with frequency omega = 2eV/sic. The ac voltage (V) over tilde cos(Omega(0)t) generates a series of supercurrent branches relating to the ac voltage frequency Omega(0) and its magnitude (V) over tilde. The photon heat current is determined by the superposition of different heat current branches induced by the dc and ac fields. The frequencies omega and Omega(0) relating to dc and ac fields play important role in controlling the photon heat current and conductance. The detailed magnitude and oscillation structure are strongly dependent on the frequency ratio omega/Omega(0), and the scaled magnitude of ac field Lambda = 2e (V) over tilde /sic Omega(0) Resonant heat current appears when omega and Omega(0) possess commensurate relations, where the superposition of heat current branches displays coherent interference. As omega and Omega(0) possess incommensurate relations, heat current is much smaller, and it fluctuates fiercely compared with the commensurate cases. Beat-like resonance emerges by tuning the frequencies omega and Omega(0) at some definite values of Coulomb energy.

• 出版日期2017-10
• 单位北京理工大学