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Boundary conformal field theory approach to the two-dimensional critical Ising model with a defect line
Masaki Oshikawa, Ian Affleck
We study the critical two-dimensional Ising model with a defect line (altered bond strength along a line) in the continuum limit. By folding the system at the defect line, the prob…
Magnetization plateaus in spin chains: ``Haldane gap'' for half-integer spins
Masaki Oshikawa, Masanori Yamanaka, Ian Affleck
We discuss zero-temperature quantum spin chains in a uniform magnetic field, with axial symmetry. For integer or half-integer spin, , the magnetization curve can have plateaus a…
Defect Lines in the Ising Model and Boundary States on Orbifolds
Masaki Oshikawa, Ian Affleck
Critical phenomena in the two-dimensional Ising model with a defect line are studied using boundary conformal field theory on the orbifold. Novel features of the boundary sta…
Hidden Order and Dimerization Transition in Chains
Masanori Yamanaka, Masaki Oshikawa, Seiji Miyashita
We study ground state properties of the quantum antiferromagnetic chain with a bond alternation \[ H = \sum_{j} [ 1 + δ(-1)^j ] \mbox{\boldmath }_{j} \cdot \mbox{\boldmath…