Correlation in a coherent electron beam
Correlation in a coherent electron beam
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相干电子束的相关性
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
A. Tonomura
中科院分区：
文献类型：
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作者：
T. Kodama;N. Osakabe;A. Tonomura
本文用透射电子显微镜研究了自由电子束中连续探测之间的相关性。对于检测器的非相干照明，观察到一定的随机符合概率，指示电子的不相关到达时间。当照明从非相干变为相干时，观察到随机符合概率的减少，指示电子到达时间的反聚束。然而，减少的量大于根据泡利原理计算的理论预期值，禁止一个以上的相同费米子占据相同的量子态。对于一定的相干照明的检测器，在那里我们使用磁透镜在电子显微镜的相干长度的放大倍数，我们发现一个增强的符合概率，指示聚束在电子的到达时间。这源于自由电子束由于库仑相互作用而产生的相关性。
Correlations between successive detections in beams of free electrons are studied with a transmission electron microscope. For incoherent illumination of the detectors, a certain random coincidence probability is observed, indicative for uncorrelated arrival times of the electrons. When the illumination is changed from incoherent to coherent, a reduction of the random coincidence probability is observed, indicative for antibunching in the arrival times of the electrons. However, the amount of reduction is larger than the theoretically expected value calculated from the Pauli principle, forbidding more than one identical fermion to occupy the same quantum state. For a certain coherent illumination of the detectors, where we use magnetic lenses in electron microscopes for magnifications of the coherence length, we find an enhanced coincidence probability, indicative for bunching in the arrival times of the electrons. This originates from correlations in beams of free electrons due to Coulomb interactions.