Dynamical response of quantum spin-glass models at t = 0.
Dynamical response of quantum spin-glass models at t = 0.
复制标题
量子自旋玻璃模型在 t = 0 时的动态响应。
DOI：
10.1103/physrevlett.86.5172
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发表时间：
2001
影响因子：
8.6
通讯作者：
M. Rozenberg
中科院分区：
文献类型：
--
作者：
L. Arrachea;M. Rozenberg
本文利用精确对角化技术研究了两种典型的量子自旋玻璃在T = 0时的行为：横场中的随机伊辛模型和随机海森堡模型。在自旋玻璃有序相中得到了动态自旋响应的行为。在这两个模型中，它都是无间隙的，并且具有一般形式chi（“）（omega）= qdelta（omega）+chi（“）（reg）（omega），其中chi（“）（reg）（omega）对于伊辛近似为omega，chi（“）（reg）（omega）对于海森堡近似为常数，在低频下。该方法提供了新的见解的物理性质的低洼激发。
We study the behavior of two archetypal quantum spin glasses at T = 0 by exact diagonalization techniques: the random Ising model in a transverse field and the random Heisenberg model. The behavior of the dynamical spin response is obtained in the spin-glass ordered phase. In both models it is gapless and has the general form chi(")(omega) = qdelta(omega)+chi(")(reg)(omega), with chi(")(reg)(omega) approximately omega for the Ising and chi(")(reg)(omega) approximately const for the Heisenberg, at low frequencies. The method provides new insight to the physical nature of the low-lying excitations.