超晶格中超热电子的负横向电导
Negative lateral conductivity of hot electrons in a biased superlattice
摘要：
在紧束缚近似下研究了均匀电场作用下超晶格（等布居能级的偏置超晶格）中的非平衡电子分布，同时考虑了光学声子、声学声子和横向无序的散射.结果表明，面内动能的分布主要取决于布洛赫能量与光学声子能量的比值。计算了4.2K和20K温度下低掺杂结构的面内电导率。负电导率被发现对应于布洛赫声子共振条件的偏置电压。
英文摘要：
Nonequilibrium electron distribution in a superlattice subjected to a homogeneous electric field (biased superlattice with equipopulated levels) is studied within the tight-binding approximation, taking into account the scattering by optical and acoustic phonons and by lateral disorder. It is found that the distribution versus the in-plane kinetic energy depends essentially on the ratio between the Bloch energy and the optical phonon energy. The in-plane conductivity is calculated for low-doped structures at temperatures 4.2 K and 20 K. The negative conductivity is found for bias voltages corresponding to the Bloch-phonon resonance condition.
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