Asymmetric scattering and diffraction of two-dimensional electrons at quantized tubes of magnetic flux.
Asymmetric scattering and diffraction of two-dimensional electrons at quantized tubes of magnetic flux.
复制标题
二维电子在量子化磁通量管上的不对称散射和衍射。
DOI：
10.1103/physrevlett.69.2252
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发表时间：
1992
影响因子：
8.6
通讯作者：
I. Grigorieva
中科院分区：
文献类型：
--
作者：
A. Geim;S. Bending;I. Grigorieva
本文研究了高迁移率二维电子气(2DEG)在第二类超导“栅极”层上形成的量子化磁通管(涡旋)的霍尔电导。对于长费米波长(与亚微米涡旋尺寸相比)，霍尔效应被明显地抑制，这表明电子被通量量子衍射。相反，对于较短的费米波长，霍尔电导率已被发现对磁场的极端不均匀性不敏感，并由平均场决定。
The Hall conductivity of a high-mobility two-dimensional electron gas (2DEG) has been investigated in a distribution of quantized magnetic flux tubes (vortices) formed at a type-II superconducting "gate" layer. A pronounced suppression of the Hall effect was observed for long Fermi wavelengths (as compared to the submicron vortex size) indicating a situation where electrons are diffracted by the flux quanta. In contrast, for shorter Fermi wavelengths the Hall conductivity has been found to be insensitive to the extreme inhomogeneity of the magnetic field and determined by the average field.