外场中含缺陷量子Ising链的严格解

THE EXACT SOLUTION OF ISING QUANTUM CHAIN WITH DEFECTS IN EXTERNAL FIELD

本文利用Ｌｉｅｂ、Ｓｃｈｕｌｔｚ和Ｍａｔｔｉｓ发展的费米子方法严格求解含连续缺陷量子Ｉｓｉｎｇ链的低能激谱，当相互作用系数ｆ（ｘ）满足一定条件时，系统能谱具有等间距塔状结构，这表明该类系统仍保持共形不变性。

The energy spectrum of the Ising Quantum chaining with continuous defects is solved exactly by using fermion technique. The excitation spectrum obtained in the continuous limit have a tower structure when interaction coefficient f(x) is the solution to the differential equation. This means that conformal invariance is preserved in these systems.