Proceedings of the National Academy of Sciences of the United States of America

About the PNAS Member Editor
Name Andrei, Eva Y.
Location Rutgers, The State University of New Jersey, New Brunswick
Primary Field Physics
Secondary Field Applied Physical Sciences
 Election Citation
Andrei's seminal work in low-dimensional systems includes the first observation of a magnetically-induced Wigner solid in GaAs, studies of the liquid-solid transition, 2D electrons on superfluid helium, vortex dynamics in superconductors, the realization of freely suspended graphene layers and the observation of the fractional quantum Hall effect in graphene.
 Research Interests
Andrei employs magneto-transport, scanning tunneling microscopy and spectroscopy, to elucidate the electronic properties of graphene and other 2-dimensional materials, and how they are affected by external perturbations such as magnetic field, charge impurities, boundaries and substrate materials. For example she and her group demonstrated that by suspending graphene so as to leave it unattached to a substrate it is possible to access the intrinsic properties of its unusual charge carriers. This led to the observation of the so called "fractional quantum Hall effect", providing a direct manifestation of unexpectedly strong electron- electron correlations in this material. In 2009, the AAAS journal Science cited these findings in its list of the year's 10 groundbreaking scientific achievements. Another example is the discovery by Andrei and her group of so-called "Van Hove singularities" in the band structure of stacked graphene layers. They showed that by superposing graphene layers so that their relative crystal orientation is twisted away from equilibrium it is possible to change in a controlled way the band structure, a property which is usually considered to be intrinsic to the chemical composition and crystal structure of a material.

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