REU Project ID 4.4

Electrically controlled qubits in Doped Ferroelectrics

Prof. R. Ramesh

We are exploring electric field manipulation of spins in a ferroelectric medium using dilute Fe3+-doped PbTiO3 and other polar materials as model systems. Combining first-principles calculations and electron paramagnetic resonance (EPR) with single crystal and epitaxial superlattice synthesis, we are trying to show that the spins in the Fe3+ ion are preferentially aligned perpendicular to the ferroelectric polar axis, which we can manipulate using an electric field.

Using this, we can demonstrate coherent control of the phase of spin superpositions by applying electric field pulses during time-resolved EPR measurements. Our work provides a new pathway towards the manipulation of spins for quantum and classical spintronics.

In collaboration with Sinewad Griffin and Peter Ercius, LBNL, and A. Ardavan, Oxford University