Experimental Progress on the Quantum Ratchet Effect

 

Nicole Cassano '05

Advisor:  Dr. Kenneth Segall

 

We report on experimental progress toward observing the quantum ratchet effect in an array of nine Josephson Junctions.  The Josephson Junctions are arranged so that flux trapped in the device feels a ratchet potential.  By measuring the I-V curve produced by it, we can explore the physics of the device.  Our measurements can be explained by change in vortices and thermal activation.  Quantum tunneling remains possible but has not been  definitively observed as of yet.