论文标题
焦耳加热对超导体介质Terahertz辐射的影响
The effect of Joule heating on the terahertz radiation in the superconductor media
论文作者
论文摘要
II型超导体中的移动涡旋晶格可能会导致电磁波在Terahertz频率范围内的辐射。超导体中的涡流流动动力学遵循伦敦方程式。在本文中，通过在存在涡流的情况下求解伦敦方程来研究超导体相干长度和伦敦穿透深度对辐射功率的影响。结果表明，通过降低相干长度，辐射功率将显着增加。同样，通过增加穿透深度，可以通过尖峰获得更辐射的功率。对焦耳加热作用的进一步研究表明，当我们远离临界温度时，辐射功率几乎独立于温度。但另一方面，在临界温度附近，辐射功率很大程度上取决于温度变化。同样，通过增加偏置电流，辐射功率将增加，并且辐射峰的频率将相应变化。
Moving vortex lattice in type-II superconductors can result in the radiation of electromagnetic waves in the range of terahertz frequency. The vortex flow dynamics in superconductors follow the London equation. In this paper, the effects of the superconductor coherence length and the London penetration depth on the radiated power is investigated by solving the London equation in the presence of vortices. The results show that by decreasing the coherence length, the radiation power will significantly increase. Also, it is possible to obtain more radiated power with a sharp peak by increasing the penetration depth. Further investigation of the effect of Joule heating reveals that radiation power is almost independent of temperature when we are far from critical temperature. But on the other hand, near the critical temperature, the radiation power is strongly dependent on the temperature variation. Also, by increasing the bias current, the radiation power will augment, and the frequency of radiated peaks will change accordingly.
