TY - JOUR
T1 - Random-field-driven phase transitions in the ground state of the S = 1 XXZ spin chain
AU - Nishiyama, Yoshihiro
N1 - Funding Information:
Our computer programs are partly based on the subroutine package “TITPACK Ver. 2” coded by Professor H. Nishimori. Numerical simulations were performed on the parallel supercomputers FUJITSU VPP700/56 of the computer center, Kyushu university. The numerical calculations were supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Science and Culture, Japan.
PY - 1998/10/1
Y1 - 1998/10/1
N2 - The ground state of the S = 1 XXZ spin chain under the influence of the random magnetic field is studied by means of the exact diagonalization method. The S = 1/2 counterpart has been investigated extensively so far. The easy-plane area, including the Haldane and the XY phases, is considered. The area suffers significantly from the magnitude of the constituent spin. Destruction of the Haldane state is observed at a critical strength of the random field, which is comparable to the magnitude of the Haldane gap. This transition is characterized by the disappearance of the string order. The XY region continues until at a critical randomness, at which a transition of the KT-universality class occurs. These features are contrasted with those of the S = 1/2 counterpart.
AB - The ground state of the S = 1 XXZ spin chain under the influence of the random magnetic field is studied by means of the exact diagonalization method. The S = 1/2 counterpart has been investigated extensively so far. The easy-plane area, including the Haldane and the XY phases, is considered. The area suffers significantly from the magnitude of the constituent spin. Destruction of the Haldane state is observed at a critical strength of the random field, which is comparable to the magnitude of the Haldane gap. This transition is characterized by the disappearance of the string order. The XY region continues until at a critical randomness, at which a transition of the KT-universality class occurs. These features are contrasted with those of the S = 1/2 counterpart.
KW - Exact-diagonalization method
KW - Haldane phase
KW - Localization-delocalization transition
KW - Random magnetic field
KW - XY phase
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U2 - 10.1016/S0378-4371(98)00250-7
DO - 10.1016/S0378-4371(98)00250-7
M3 - Article
AN - SCOPUS:0347594351
SN - 0378-4371
VL - 259
SP - 90
EP - 104
JO - Physica A: Statistical Mechanics and its Applications
JF - Physica A: Statistical Mechanics and its Applications
IS - 1-2
ER -