March 20, 2014 at 1:30 pm

CMSS: Quantum Interference Noise in Graphene, March 20

The Condensed Matter & Surface Sciences Colloquium series presentsDr. Nina Markovic of  John Hopkins University on “Quantum Interference Noise in Graphene” on Thursday, March 20, at 4:10 p.m. in Walter 245.

Dr. Nina Markovic

Dr. Nina Markovic

Abstract: Low frequency noise is a ubiquitous phenomenon that plagues electronic devices, but it is often difficult to determine the physical mechanism that causes it. There is, however, one particular mechanism that is easy to distinguish by its dependence on temperature and magnetic field: quantum interference noise. Expected to be observed at low temperatures when other mechanisms are mostly frozen out, this type of noise occurs due to quantum interference between different paths taken by the electron upon scattering on impurities that fluctuate slowly over time. Vastly underutilized as a tool to study properties of disordered systems, quantum interference noise depends strongly on the underlying symmetries and offers ensemble-averaged information that is complementary to conductance and tunneling measurements. I will describe measurements of quantum interference noise in graphene devices and show how it can be used as a unique probe of the scattering mechanisms and relevant symmetry classes in novel materials.

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