论文标题
用超低原子量化非线性传输
Quantized Nonlinear Transport with Ultracold Atoms
论文作者
论文摘要
在这封信中，我们提出了如何使用谐波陷阱中使用二维超低原子费米气体测量量化的非线性转运。该方案需要在左侧和下半平台上连续应用两个光脉冲，然后测量第一个象限中的额外原子数。在理想的情况下，对两个连续脉冲的非线性密度响应进行了量化，量化值探测了陷阱中心局部费米海的欧拉特征。我们研究了实验中的实际效果，包括有限的脉冲持续时间，脉冲的有限边缘宽度和有限温度，这可能导致量化量化。我们提出了一种通过在对称考虑因素的启发下在第一和第三象限下进行的平均测量值来减少偏差的方法。使用这种方法，可以很好地观察到量化的非线性响应，可以通过超低原子容易实现实验条件来很好地观察到。
In this letter, we propose how to measure the quantized nonlinear transport using two-dimensional ultracold atomic Fermi gases in a harmonic trap. This scheme requires successively applying two optical pulses in the left and lower half-planes and then measuring the number of extra atoms in the first quadrant. In ideal situations, this nonlinear density response to two successive pulses is quantized, and the quantization value probes the Euler characteristic of the local Fermi sea at the trap center. We investigate the practical effects in experiments, including finite pulse duration, finite edge width of pulses, and finite temperature, which can lead to deviation from quantization. We propose a method to reduce the deviation by averaging measurements performed at the first and third quadrants, inspired by symmetry considerations. With this method, the quantized nonlinear response can be observed reasonably well with experimental conditions readily achieved with ultracold atoms.
