论文标题
三角洲T驱动的介质导体的光发射
Light emission in delta-T-driven mesoscopic conductors
论文作者
论文摘要
介观导体中电子传输的散射图表表明，电流的波动揭示了有关仅通过电导而无法提供的散射机制的其他信息。电子波动耦合到电磁场，有限偏置或温度下的连接将散发出辐射。非对称电流相关因子表征发射和吸收光谱。最近的兴趣集中在所谓的Delta-T噪声上，即终端之间的温度差引起的非平衡噪声。在这里，我们将Delta-T噪声的概念推广到有限频率下的非对称电流相关器。我们研究了无关的散射的光谱密度和共振水平的一个示例。我们发现温度差$ΔT$导致某些频率范围的噪声部分降低。这是由于温度与所涉及的费米分布的频率变化而变化的结果。在无关散射的情况下，最低顺序是二次$ \ propto（ΔT）^2 $校正热噪声频谱。对于共鸣，对Delta-T噪声光谱的额外贡献是$ \ proptoΔt$的最低顺序。
The scattering picture of electron transport in mesoscopic conductors shows that fluctuations of the current reveal additional information on the scattering mechanism not available through the conductance alone. The electronic fluctuations are coupled to the electromagnetic field and a junction at finite bias or temperature will emit radiation. The nonsymmetrized current-current correlators characterize the emission and absorption spectrum. Recent interest is focused on the so-called delta-T noise, which is the nonequilibrium noise caused by a temperature difference between the terminals. Here, we generalize the notion of delta-T noise to the nonsymmetrized current-current correlator at finite frequencies. We investigate the spectral density for energy-independent scattering and for a resonant level as an example of energy-dependent scattering. We find that a temperature difference $ΔT$ leads to a partial reduction of the noise for certain frequency ranges. This is a consequence of temperature broadening in combination with a frequency shift of the involved Fermi distributions. In the case of energy-independent scattering, the lowest order is a quadratic $\propto (ΔT)^2$ correction of the thermal-like noise spectrum. For the resonance, additional contributions to the delta-T noise spectrum arise that are $\propto ΔT$ to the lowest order.
