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arXiv 0809.2847quant-ph
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交换相互作用和关联从根本上改变了量子粒子在经典禁戒区域中的行为

Exchange interaction and correlations radically change behaviour of a quantum particle in a classically forbidden region

V. V. Flambaum

摘要:

交换相互作用强烈影响局域电子轨道和量子隧穿振幅的长程行为。它违反了振荡定理(产生额外的节点),并产生幂律衰减,而不是通常的大距离指数衰减。对于分子内部轨道,衰变为$r^{-2}$,对于宏观系统$\cos{(k_f r)} r^{-ν}$,其中$k_f$为费米动量,对于一维晶体为$ν=3$,对于二维晶体为$ν=$ 3.5,对于三维晶体为$ν=$ 4。相关性修正并不改变这些结论。慢衰变增加了局域自旋之间的交换相互作用和势垒下隧穿幅度。固体中的势垒下透射系数(例如点接触)变得依赖于温度。

英文摘要:

Exchange interaction strongly influences the long-range behaviour of localised electron orbitals and quantum tunneling amplitudes. It violates the oscillation theorem (creates extra nodes) and produces a power-law decay instead of the usual exponential decrease at large distances. For inner orbitals inside molecules decay is $r^{-2}$, for macroscopic systems $\cos{(k_f r)} r^{-ν}$, where $k_f$ is the Fermi momentum and $ν=3$ for 1D, $ν=$3.5 for 2D and $ν=$4 for 3D crystal. Correlation corrections do not change these conclusions. Slow decay increases the exchange interaction between localized spins and the under-barrier tunneling amplitude. The under-barrier transmission coefficients in solids (e.g. for point contacts) become temperature-dependent.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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