通过超导太赫兹发射器的极化分析演示相互同步的宏观约瑟夫森振荡

Powerful terahertz emission from Bi2Sr2CaCu2O8+delta mesa arrays

Stacks of intrinsic Josephson junctions (IJJs) in high-temperature superconductors enable the fabrication of compact sources of coherent terahertz radiation. Here we demonstrate that multiple stacks patterned on the same Bi2Sr2CaCu2O8+delta crystal can - under optimized conditions - be synchronized to emit high-power THz-radiation. For three synchronized stacks we achieved 610 microwatts of continuous-wave coherent radiation power at 0.51 THz. We suggest that synchronization is promoted by THz-waves in the base crystal. We note though that synchronization cannot be achieved in all samples. How…

Spontaneous frequency shift and phase delay of coupled terahertz radiations mediated by the Josephson plasmon in a cuprate superconductor

We examine coupling interactions used to synchronize macroscopic Josephson oscillations induced in intrinsic Josephson junction (IJJ) mesa stacks made of a Bi2212 single crystal. Synchronized radiations of terahertz electromagnetic (EM) waves are detected under common voltage and current bias operations of two connected mesas with close individual radiation frequencies, while uncoupled and bimodal radiations are frequently observed in two mesas with different individual radiation frequencies. Detailed observations of the polarizations of the EM waves emitted when two mesas are biased in parall…

来自相互同步的独立Bi2Sr2CaCu2O8+x本征约瑟夫森结堆叠的太赫兹辐射

Terahertz emission from mutually synchronized standalone Bi2Sr2CaCu2O8+x intrinsic-Josephson-junction stacks

本文证明独立BSCCO本征约瑟夫森结堆叠可通过共享公共金层实现相互同步，在745-765 GHz范围内表现出±0.4 GHz的相位相关性，为缓解焦耳热限制、同步更多堆叠并提高太赫兹辐射功率提供了新途径。

Emission of Terahertz Waves from Stacks of Intrinsic Josephson Junctions

By patterning mesoscopic crystals of Bi2Sr2CaCu2O8 (BSCCO) into electromagnetic resonators the oscillations of a large number of intrinsic Josephson junctions can be synchronized into a macroscopic coherent state accompanied by the emission of strong continuous wave THz-radiation. The temperature dependence of the emission is governed by the interplay of self-heating in the resonator and by re-trapping of intrinsic Josephson junctions which can yield a strongly nonmonotonic temperature dependence of the emission power. Furthermore, proper shaping of the resonators yields THzsources with voltag…

铜氧化物超导体堆叠本征约瑟夫森结的时分辨同步分析：频率调制太赫兹辐射谱

Time-resolved synchronization analysis of stacked intrinsic Josephson junctions of a cuprate superconductor with frequency-modulated terahertz radiation spectra

通过分析频率调制的太赫兹辐射谱，研究Bi2212本征约瑟夫森结的同步动力学，发现双高斯峰结构，提取同步弛豫时间约0.28 ns，揭示亚纳秒非平衡动力学。

通过太赫兹光驱动的持续赝自旋相干观测超导孤子

Observation of Superconducting Solitons by Terahertz-Light-Driven Persistent Pseudo-Spin Coherence

本研究利用强多周期太赫兹周期性驱动，在铁基超导体外延薄膜中首次观测到受驱超导孤子态，揭示了其类弗洛凯边带特征与同步安德森赝自旋振荡机制，为超导量子器件与信息技术的退相干瓶颈突破提供了新途径。