论文标题
在2D电子气体的门控磁盘中血浆共振的辐射阻尼中的振荡
Oscillations in the radiative damping of plasma resonances in a gated disk of 2D electron gas
论文作者
论文摘要
我们在存在金属栅极的情况下计算导电盘的吸收光谱。在我们的分析中，我们使用Drude模型描述的电导率。我们检查了与激发等离子体波相关的吸收共振的频率和线宽度。它们的基本和轴对称等离子体模式都在数值和分析上估计。线宽由碰撞和辐射损失确定。在高迁移率样本中，即使可以通过标准的绝对近似（即忽略电磁障碍）来描述谐振频率，后者也可能占主导地位。由于磁盘和金属电荷产生的电磁场的干扰，将金属放置在磁盘附近的金属会极大地影响线宽度的辐射扩大。将磁盘靠近大门的磁盘几乎消失了。在这种情况下，线宽度仅由碰撞拓宽来定义。当磁盘从门上移开时，线宽度首先显示出降低，因为等离子体变成了等离子 - 孔子，该等离子 - 孔子是在磁盘周围的未固定电磁场穿着的。然后，它增加并表现出腐烂的振荡，达到未支配磁盘的渐近值。
We calculate the absorption spectra of a conductive disk in the presence of a metal gate. In our analysis, we use the conductivity described by the Drude model. We examine the frequency and line width of the absorption resonances associated with the excited plasma waves. They are estimated both numerically and analytically for the fundamental and axisymmetric plasma modes. The line width is determined by the collisional and radiative losses. In high mobility samples, the latter may dominate even when the resonant frequencies can be described by a standard quasistatic approximation, i.e., neglecting electromagnetic retardation. Placing a metal near the disk drastically affects the radiative broadening of the line width due to the interference of electromagnetic fields created by the disk and the metal charges. Bringing the disk in close proximity to the gate makes the total field almost vanish. In that case, the line width is defined solely by the collisional broadening. As the disk is moved away from the gate, the line width first shows a reduction since the plasmon transforms into plasmon-polariton, which is dressed with undamped electromagnetic field surrounding the disk. Then it increases and exhibits decaying oscillations, reaching the asymptotic value of the ungated disk.
