Kinks in the Kondo problem.
Kinks in the Kondo problem.
复制标题
近藤问题中的纠结。
作者：
Fendley
我们找到了与自旋杂质 [ital S] 耦合的 [ital k] 种电子的连续介质 Kondo 问题的精确准粒子谱、弹性 [ital S] 矩阵和自由能。在这里，杂质成为位于边界上的不动的准粒子。这些粒子是扭结，可以被认为是在具有 [ital k]+1 简并最小值的势的相邻井之间插值的场配置。对于过度筛选的情况 [ital k][gt]2[ital S]，连续体中的杂质也是一个扭结，这解释了边界态的非整数数量。
We find the exact quasiparticle spectrum, elastic [ital S] matrix, and free energy for the continuum Kondo problem of [ital k] species of electrons coupled to an impurity of spin [ital S]. Here, the impurity becomes an immobile quasiparticle sitting on the boundary. The particles are kinks,' which can be thought of as field configurations interpolating between adjacent wells of a potential with [ital k]+1 degenerate minima. For the overscreened case [ital k][gt]2[ital S], the impurity in the continuum is a kink as well, which explains the noninteger number of boundary states.