Prof Arzhang Ardavan

Abstract:

The long spin lifetimes exhibited by endohedral fullerenes imply that they can store quantum information and hence have the potential to be used as qubits. Production of asymmetrical endohedral fullerene dimers (e.g. iNC(60)-iNC(70)) could lead to ordered arrays of ABABAB sequences. This kind of molecular self-assembly offers potential for creating large qubit arrays, a precondition for any scalable quantum computer. We present our progress towards the production and characterisation of endohedral fullerenes, fullerene dimers and array structures and their potential use in quantum computation.

Abstract:

The interlayer transfer integrals of various organic superconductors have been deduced using high-magnetic-field techniques. The measurements demonstrate the inappropriateness of criteria used to denote incoherent interlayer transport.

Abstract:

We report a study of the angle-dependent millimetre-wave magnetoconductivity of the p-wave triplet-paired perovskite superconductor Sr2RuO4. We find two harmonic series. We assign the first to interlayer cyclotron resonance of the beta-Fermi surface and its harmonics, yielding a cyclotron effective mass of m(beta)(cr) = 4.25 m(e). We assign the second series, which contains only odd harmonics, to cyclotron resonance of the gamma-Fermi surface, yielding a cyclotron effective mass of m(gamma)(cr) = 12.4 m(e). In addition, we find a very strong absorption mode in the presence of a magnetic field component parallel to the quasi-two-dimensional (Q2D) planes of the sample. Its dependence on the orientation of the magnetic field cannot be described in the context of conventional Q2D cyclotron resonance, and the origin of this mode is not yet clear.