51 citations · 181 across the 9 of their papers we have counts for
9 papers
Hamiltonian ratchets with ultra-cold atoms
Jiating Ni, Siamak Dadras, Wa Kun Lam +4
Quantum-resonance ratchets have been realized over the last ten years for the production of directed currents of atoms. These non-dissipative systems are based on the interaction o…
Initial state dependence of a quantum-resonance ratchet
Jiating Ni, Wa Kun Lam, Siamak Dadras +3
We demonstrate quantum resonance ratchets created with Bose-Einstein condensates exposed to pulses of an off-resonant standing light wave. We show how some of the basic properties…
Steering random walks with kicked ultracold atoms
Marcel Weiß, Caspar Groiseau, W. K. Lam +4
A kicking sequence of the atom optics kicked rotor at quantum resonance can be interpreted as a quantum random walk in momentum space. We show how to steer such a random walk by ap…
Dynamical tunneling of a Bose-Einstein condensate in periodically driven systems
R. K. Shrestha, J. Ni, W. K. Lam +2
We report measurements of dynamical tunneling rates of a Bose-Einstein condensate across a barrier in classical phase space. The atoms are initially prepared in quantum states that…
Controlling the Momentum Current of an Off-resonant Ratchet
R. K. Shrestha, J. Ni, W. K. Lam +2
We experimentally investigate the phenomenon of a quantum ratchet created by exposing a Bose-Einstein Condensate to short pulses of a potential which is periodic in both space and…
A cold-atom ratchet interpolating between classical and quantum dynamics
R. K. Shrestha, W. K. Lam, J. Ni +1
We study the crossover between classical and quantum dynamics by observing the behavior of a quantum ratchet created by exposing a Bose-Einstein condensate to short pulses of a pot…