Sil Shreekantha, Maiti Santanu K, Chakrabarti Arunava
Department of Physics, Visva-Bharati, Santiniketan, West Bengal-731 235, India.
Phys Rev Lett. 2008 Aug 15;101(7):076803. doi: 10.1103/PhysRevLett.101.076803.
We prove that a tight-binding ladder network composed of atomic sites with on-site potentials distributed according to the quasiperiodic Aubry model can exhibit a metal-insulator transition at multiple values of the Fermi energy. For specific values of the first and second neighbor electron hopping, the result is obtained exactly. With a more general model, we numerically calculate the two-terminal conductance. The numerical results corroborate the analytical findings.
我们证明，由具有根据准周期奥布里模型分布的在位势的原子位点组成的紧束缚梯子网络，在费米能量的多个值处可表现出金属-绝缘体转变。对于第一和第二近邻电子跳跃的特定值，可精确得到结果。采用更一般的模型，我们数值计算了两端电导。数值结果证实了分析结果。
