Electrically induced spin resonance fluorescence. I. Theory
Electrically induced spin resonance fluorescence. I. Theory
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DOI：
10.1103/physrevb.76.075311
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发表时间：
2007-08
影响因子：
3.7
通讯作者：
A. Nogaret;F. Peeters
中科院分区：
文献类型：
--
作者：
A. Nogaret;F. Peeters
我们计算了电子自旋被限制在一个平面上，并被一个磁场梯度和一个彼此成直角的恒定磁场驱动进入共振的荧光。我们求解二维电子在磁场梯度中的运动方程，导出自旋振荡器的色散曲线、电子振荡的幅度、电子自旋感测的有效磁场以及电子从电极注入自旋振荡器的速率。然后，我们打开自旋磁偶极子和电磁场之间的相互作用，以找到由各个自旋振荡器辐射的荧光功率。首先导出辐射衰变的速率，然后是顺序光子发射的概率，由此在随机时间发生一系列自发衰变，所述随机时间由自旋执行拉比振荡的间隔隔开。随机辐射衰变之间的量子相关性表现为沿导线沿着有规律间隔的发射脉冲。我们整合所有的多光子过程，以获得辐射的电磁功率的精确解析表达式。本理论得到的所有参数的问题，包括磁偶极耦合，粒子在磁场梯度的停留时间，和自旋极化的传入电流。的输出功率包含一个精细的结构所产生的电子振荡的非谐性和非线性光学效应，这两个卫星发射峰值在奇数倍的基本频率。
We calculate the fluorescence of electron spins confined to a plane and driven into resonance by a magnetic field gradient and a constant magnetic field applied at right angles to each other. We solve the equation of motion of two-dimensional electrons in the magnetic field gradient to derive the dispersion curve of spin oscillators, the amplitude of electron oscillations, the effective magnetic field sensed by the electron spin, and the rate at which electrons are injected from an electrode into spin oscillators. We then switch on the interaction between the spin magnetic dipole and the electromagnetic field to find the fluorescence power radiated by the individual spin oscillators. The rate of radiative decay is first derived, followed by the probability of sequential photon emission whereby a series of spontaneous decays occurs at random times separated by intervals during which the spin performs Rabi oscillations. The quantum correlations between random radiative decays manifest as bursts of emission at regular intervals along the wire. We integrate all multiphoton processes to obtain an exact analytical expression for the radiated electromagnetic power. The present theory obtains all parameters of the problem including magnetodipole coupling, the particle dwell time in the magnetic field gradient, and the spin polarization of the incoming current. The output power contains a fine structure arising from the anharmonicity of electron oscillations and from nonlinear optical effects which both give satellite emission peaks at odd multiples of the fundamental frequency.