Phys. Rev. Lett. 90, 047203 (2003) [4 pages]Algorithm for Linear Response Functions at Finite Temperatures: Application to ESR Spectrum of s=1/2 Antiferromagnet Cu BenzoateReceived 16 October 2002; published 31 January 2003 We introduce an efficient and numerically stable method for calculating linear response functions χ(q,ω) of quantum systems at finite temperatures. The method is a combination of numerical solution of the time-dependent Schrödinger equation, random vector representation of trace, and Chebyshev polynomial expansion of Boltzmann operator. This method should be very useful for a wide range of strongly correlated quantum systems at finite temperatures. We present an application to the ESR spectrum of s=1/2 antiferromagnet Cu benzoate. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.90.047203
DOI:
10.1103/PhysRevLett.90.047203
PACS:
75.10.Jm, 75.40.Gb, 75.40.Mg
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