Spaser的外光波强迫同步

SPASER的精确可解玩具模型

Exactly solvable toy model for a SPASER

我们提出了一个精确可解的准经典Spaser模型。增益介质用具有负损耗的非线性介电常数来描述。该模型演示了spaser的主要特点：一个自振荡状态（spasing）产生没有外部驱动场，如果抽运超过一定的阈值，同步的spaser由外部字段内的阿诺德舌头，和补偿焦耳损失的可能性时，抽运低于阈值。与普通激光器类似，到spasing状态的转变采取霍普夫分叉的形式。

Direct and parametric synchronization of a graphene self-oscillator

We explore the dynamics of a graphene nanomechanical oscillator coupled to a reference oscillator. Circular graphene drums are forced into self-oscillation, at a frequency fosc, by means of photothermal feedback induced by illuminating the drum with a continuous-wave red laser beam. Synchronization to a reference signal, at a frequency fsync, is achieved by shining a power-modulated blue laser onto the structure. We investigate two regimes of synchronization as a function of both detuning and signal strength for direct (fsync = fosc) and parametric locking (fsync = 2fosc). We detect a regime o…

Self-synchronization of thermal phonons at equilibrium

Self-synchronization is a ubiquitous phenomenon in nature, in which oscillators are collectively locked in frequency and phase through mutual interactions. While self-synchronization requires the forced excitation of at least one of the oscillators, we demonstrate that this mechanism spontaneously appears due to the activation from thermal fluctuations. By performing molecular dynamic simulations, we demonstrate the self-synchronization of thermal phonons in a platform supporting doped silicon resonators. We find that thermal phonons are spontaneously converging to the same frequency and phase…

半导体微腔中强迫耦合量子阱中光子强度的增强

Enhancement of photon intensity in forced coupled quantum wells inside a semiconductor microcavity

数值研究了周期性外力作用下含$N\ge 2$量子阱的半导体微腔的光子发射。发射是由外部强迫和井之间的内部相互作用之间的相互作用。当外力作用破坏周期运动时，内部相互作用破坏周期运动，哈密顿量的非线性项支持同步。数值计算结果表明，当量子阱数目不太大时，在一定的临界外力作用下，光子强度会出现很大的跳跃。我们讨论了系统的动力学在这个过渡。

Synchronization and chaos in a spin-torque oscillator with a perpendicularly magnetized free layer

Synchronization and chaos caused by alternating current and microwave field in a spin torque oscillator consisting of a perpendicularly magnetized free layer and an in-plane magnetized reference layer is comprehensively studied theoretically. A forced synchronization by the alternating current is observed in numerical simulation over wide ranges of its amplitude and frequency. An analytical theory clarifies that the nonlinear frequency shift, as well as the spin-transfer torque asymmetry, plays a key role in determining locking range and phase difference between the oscillator and current. Cha…