Disorder effects in tunable waveguide arrays with parity-symmetric tunneling

作者：Thompson Clinton^*; Joglekar Yogesh N; Vemuri Gautam

来源：Physical Review A, 2012, 86(4): 043822.

DOI：10.1103/PhysRevA.86.043822

We investigate the effects of disorder on single-particle time evolution and two-particle correlations in an array of evanescently coupled waveguides with position-dependent tunneling rates. In the clean limit, the energy spectrum of such an array is widely tunable. In the presence of a Hermitian on-site or tunneling disorder, we find that the localization of a wave packet is highly sensitive to this energy spectrum. In particular, for an input confined to a single waveguide, we show that the fraction of light localized to the original waveguide depends on the tunneling profile. We compare the two-particle intensity correlations in the presence of Hermitian tunneling disorder and non-Hermitian, parity- and time-reversal (PT) symmetric, on-site potential disorder. We show the two-particle correlation function in both cases is qualitatively similar since both disorders preserve the particle-hole symmetric nature of the energy spectrum.

• 出版日期2012-10-15