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Synthetic vector potentials and electromagnetic fields created with light

September 21, 2009 - 12:30pm
Speaker: 
Ian Spielman
Institution: 
JQI/NIST

Ultra cold atoms are remarkable systems with a truly unprecedented level of experimental control and one application of this control is engineering the systems hamiltonian. To date this has focused mostly on the real-space potential that the atoms experience for example, multiple-well traps or optical lattice potentials. Here I present our experimental work which tailors the energy-momentum dispersion of the cold atoms. We couple different internal states of rubidium 87 via a momentum-selective Raman transition and load our system into the resulting adiabatic eigenstates. Using this technique we show the controlled modification of the energy-momentum dispersion leads to a synthetic vector potential. 

With the engineered vector potential in hand, we will see how suitable time dependence leads to synthetic electric fields and how spatial gradients can produce synthetic magnetic fields.

1201 Physics Building
College Park, MD 20742