Jeevak Parpia, Cornell University

Professor Ithaca, New York jmp9@cornell.edu Office: (607) 255-6060

Expert In

Disordered superfluids Glass at low temperatures Low temperature physics Micro-mechanical resonators Nano-mechanical resonators Non-linear characteristics Structures and graphene resonators Superfluid 3He in aerogel

Bio/Research

The study of superfluid 3He in aerogel: We use high Q oscillators, thermal conductivity and Helmholtz resonators to look for phase transitions and assay the superfluid fraction of 3He in aerogel in the millikelvin temperature range. We are exploring the A-B transition, effects of magnetic field to probe the nature of the superfluid as well as new anisotropic aerogels to "orient" the superfluid order parameter. We have constructed and operated a micromachined cell to probe superfuid 3He in the "2D" limit, where the superfluid is confined between two well characterized silicon/glass surfaces separated by distances on the order of a few coherence lengths. New experiments are planned using a Helmholtz flow cell. Other topics under active investigation are non-classical flow properties of confined 3He, the elastic properties of glasses (particularly silicon nitride under stress) at low temperatures, dielectric properties of glasses and also the heat capacity and thermal conductivity of high stress silicon nitride.

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