Coherent destruction of tunneling in a lattice array under selective in-phase modulations

Details Coherent destruction of tunneling in a lattice array under selective in-phase modulations Coherent destruction of tunneling in a lattice array under selective in-phase modulations

2011-09-26

arxiv.org/abs/1109.5622v3

Phys. Rev. A 84, 053847 (2011)

Physics

Quantum Physics

8 pages, 8 figures

Scientific paper

10.1103/PhysRevA.84.053847

We explore the coherent destruction of tunneling (CDT) in a lattice array under selective in-phase harmonic modulations, in which some selected lattice sites are driven by in-phase harmonic oscillating fields and other lattice sites are undriven. Due to the occurrence of CDT, if the driving amplitude $A$ and the driving frequency $\omega$ are tuned to satisfy the zeroth-order Bessel function $J_0(A/\omega)=0$, the driven lattice sites are approximately decoupled with the undriven lattice sites. The CDT even takes place in lattice systems with high-order couplings between non-nearest lattice sites. By using the CDT, we propose a scheme for realizing directed transport of a single particle. It is possible to observe the CDT in the engineered optical waveguide array, which provides a new opportunity for controlling light propagation and designing switch-like couplers.

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