Scaling Properties of Energy Gap in Dimerized Spinless Fermion Chains with Quasiperiodic Modulation

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2007,（4）
• 页码范围: 1035-1038
• 页数: 4页
• 语种: 英文

摘要

By employing the exact diagonalization method,we investigate the low-energy behaviour of the dimerized spinless fermion chains with quasiperiodic modulation.It is found that for off-diagonal modulation,the energy gap with length N scales as exp(-cNω)with nonuniversal exponent ω if the dimerization is nonzero.However,for diagonal modulation,there may exist a critical dimerization δc beyond which the system exhibits a metal-insulator transition.