Scaling Relation for Excitation Energy Under Hyperbolic Deformation

Details Scaling Relation for Excitation Energy Under Hyperbolic Deformation Scaling Relation for Excitation Energy Under Hyperbolic Deformation

2010-06-14

arxiv.org/abs/1006.2652v3

Prog. Theor. Phys. 124 (2010), 389-398

Physics

Condensed Matter

Other Condensed Matter

9 pages, 5 figures

Scientific paper

10.1143/PTP.124.389

We introduce a one-parameter deformation for one-dimensional (1D) quantum lattice models, the hyperbolic deformation, where the scale of the local energy is proportional to cosh lambda j at the j-th site. Corresponding to a 2D classical system, the deformation does not strongly modify the ground state. In this situation, the effective Hamiltonian of the quantum system shows that the quasi particle is weakly bounded around the center of the system. By analyzing this binding effect, we derive scaling relations for the mean-square width of confinement, the energy correction with respect to the excitation gap \Delta, and the deformation parameter $\lambda$. This finite-size scaling allows us to investigate excitation gap of 1D non-deformed bulk quantum systems.

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