A Compact Approximate Solution to the Kondo Problem

Details A Compact Approximate Solution to the Kondo Problem A Compact Approximate Solution to the Kondo Problem

2007-07-10

arxiv.org/abs/0707.1363v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevB.76.064401

A compact approximate groundstate of the Kondo problem is introduced. It consists of four Slater states. The spin up and down states of the localized d-impurity are paired with two localized s-electron states of opposite spin. All the remaining s-electron states are rearranged forming two new optimal orthonormal bases. Through a rotation in Hilbert space the two localized states (and the rest of the bases) are optimized by minimizing the energy expectation value. The ground-state energy E and the singlet-triplet excitation energy dE are calculated numerically. Although the two energies can differ by a factor of 1000, they are obtained simultaneously. The singlet-triplet excitation energy dE is proportional to exp[-1/2Jg] and quite close to the Kondo temperature k_BT_K. The cases for anti-ferromagnetic (J>0) and ferromagnetic (J<0) coupling are investigated.

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