论文标题
由过热电子和声子引起的超导纳米龙的开关测量的随机热反馈
Stochastic thermal feedback in switching measurements of superconducting nanobridge caused by overheated electrons and phonons
论文作者
论文摘要
我们研究了用电流脉冲探测的超导纳米龙的相关切换。对于低重复速率的脉冲，每个脉冲将超导桥转移到正常状态，概率$ p $与前面脉冲中的结果无关。我们表明，随着脉冲之间的时间间隔的减少，脉冲之间的远距离相关发生了：单个脉冲中的随机切换会升高桥梁的温度，并影响下一步脉冲的探测结果。结果，产生了具有可调相关强度的人造复杂随机过程。我们确定在探测脉冲的临界电流幅度下，明显的切换概率表现出明显的切换概率表现出热滞后。该工程的随机过程可以看作是人工相位过渡，并为研究相关系统提供了一个有趣的框架。该过程类似于从当前偏置纳米线中从超导到正常状态的熟悉的过渡，直到相滑雪崩。由于其对控制参数的极端敏感性，即电流，温度或磁场，因此为超敏感检测提供了机会。
We study correlated switchings of superconducting nanobridge probed with train of current pulses. For pulses with low repetition rate each pulse transits the superconducting bridge to normal state with probability $P$ independent of the outcomes in the preceding pulses. We show that with reduction of the time interval between pulses long range correlation between pulses occurs: stochastic switching in a single pulse rises temperature of the bridge and affects outcome of the probing for next pulses. As a result, an artificial intricate stochastic process with adjustable strength of correlation is produced. We identify regime where apparent switching probability exhibits the thermal hysteresis with discontinuity at a critical current amplitude of the probing pulse. This engineered stochastic process can be viewed as an artificial phase transition and provides an interesting framework for studying correlated systems. The process resembles the familiar transition from superconducting to normal state in the current-bias nanowire, proceeding through phase slip avalanche. Due to its extreme sensitivity on the control parameter, i.e. electric current, temperature or magnetic field, it offers opportunity for ultra-sensitive detection.
