Phys. Rev. Lett. 86, 5172–5175 (2001)Dynamical Response of Quantum Spin-Glass Models at T = 0Received 29 August 2000; published in the issue dated 28 May 2001 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 χ′′(ω) = qδ(ω)+χreg′′(ω), with χreg′′(ω)∼ω for the Ising and χreg′′(ω)∼const for the Heisenberg, at low frequencies. The method provides new insight to the physical nature of the low-lying excitations. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.86.5172
DOI:
10.1103/PhysRevLett.86.5172
PACS:
75.10.Nr, 75.10.Jm, 75.40.Gb
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