Critical-off-critical interface in the Ising quantum chain and conformal invariance
- 1 January 1991
- journal article
- Published by IOP Publishing in Journal of Physics A: General Physics
- Vol. 24 (1) , 245-256
- https://doi.org/10.1088/0305-4470/24/1/031
Abstract
The low-energy excitation spectrum of an Ising quantum chain in a transverse field which is critical (h=J=1) for 1-1). Interface critical exponents are determined numerically in the odd sector and exactly in the even sector using finite-size scaling. One gets an ordinary surface transition when h)J and an extraordinary surface transition when h(J. The gap-exponent relation is verified, the mass gaps and the level degeneracy are in agreement with conformal invariance.Keywords
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