Morimoto T, Henmi M, Naito R, Tsubaki K, Aoki N, Bird J P, Ochiai Y
Graduate School of Science and Technology, Chiba University, Inage-ku, Chiba 263-8522, Japan.
Phys Rev Lett. 2006 Sep 1;97(9):096801. doi: 10.1103/PhysRevLett.97.096801.
We report on a remarkable resonance in the differential conductance of long quantum point contacts (QPCs) that is observed as a precursor to regular quantized transport. This effect is increasingly pronounced in longer QPCs, in which the differential conductance may resonantly exceed 2e2/h. From a study of the experimental characteristics of this feature, we suggest that it may be associated with the formation of a well-resolved energy gap that opens dynamically as a result of enhanced many-body interactions in long QPCs.
我们报告了在长量子点接触（QPC）的微分电导中观察到的一种显著共振，它是常规量子化输运的前兆。这种效应在更长的QPC中越来越明显，其中微分电导可能共振地超过2e²/h。通过对这一特征的实验特性研究，我们认为它可能与一个分辨良好的能隙的形成有关，该能隙是由于长QPC中增强的多体相互作用而动态打开的。
