Issue |
Europhys. Lett.
Volume 39, Number 2, July II 1997
|
|
---|---|---|
Page(s) | 135 - 140 | |
Section | General | |
DOI | https://doi.org/10.1209/epl/i1997-00326-y | |
Published online | 01 September 2002 |
Quantum critical dynamics of the random transverse-field Ising spin chain
1
HLRZ, Forschungszentrum Jülich - 52425 Jülich, Germany
2
Research Institute for Solid State Physics -
H-1525 Budapest, P.O.Box 49, Hungary, Institut für Theoretische Physik, Universität zu
Köln - 50937 Köln, Germany
Received:
22
April
1997
Accepted:
10
June
1997
Dynamical correlations of the spin and the energy density are
investigated in the critical region of the random transverse-field
Ising chain by numerically exact calculations in large finite systems
. The spin-spin autocorrelation function is found to
decay proportionally to
and
in
the bulk and on the surface, respectively, with xm and
the
bulk and surface magnetization exponents, respectively. On the
other hand, the critical energy-energy autocorrelation functions have a
power law decay, which are characterized by novel critical exponents
in the bulk and
at the
surface, respectively. The numerical results are compared with the
predictions of a scaling theory.
PACS: 05.50.+q – Lattice theory and statistics; Ising problems / 64.60.Ak – Renormalization-group, fractal, and percolation studies of phase transitions / 68.35.Rh – Phase transitions and critical phenomena
© EDP Sciences, 1997
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