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Pseudospintronics: Collective Effects for Post-CMOS Logic Devices

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What
  • Seminar Series
When Apr 29, 2013
from 01:00 PM to 02:30 PM
Where Engr. IV Bldg., Shannon Room 54-134
Contact Name Prof. Diana Huffaker
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Matthew Gilbert

University of Illinois


Abstract

A particularly attractive way to solve the power consumption problem in next generation logic devices is by harnessing collective motion of electrons. While collective phenomena are normally found at low temperatures, recent work suggests it possible to find collective behavior at and above room temperature in closely spaced monolayers of graphene separated by a tunnel dielectric [1,2]. This occurs when electrons in the top layer bind with vacancies in the bottom layer via a strong Coulomb interaction to form “indirect excitons”, which in turn organize into a Bose-Einstein condensate. This type of behavior may be viewed as spontaneous interlayer coherence. In other words, spontaneous coherence is a selection of a particular superposition of states in the two layers for the entire system. To this end, pseudospintronics refers to the use of spontaneous interlayer coherence for purposes of information processing. However, despite the potential applications, the superfluid phase of layer graphene remains a poorly understood quantity. In this contribution, we theoretically examine the materials properties, length scales and transport conditions required to realize and manipulate this state at room temperature [3-6]. Additionally, we present results that suggest that a new class of materials, commonly known as topological insulators, may be a more ideal for realizing this interesting phase of matter [7]


Biography 

Matthew J. Gilbert is currently an Assistant Professor in the Department of Electrical and Computer Engineering at the University of Illinois at Urbana-Champaign (UIUC). He is affiliated with the Micro and Nanotechnology Laboratory at UIUC. His current research focuses of the development of post-CMOS technology, quantum transport theory in condensed matter systems particularly those systems under extreme conditions of strong confinement or large magnetic fields, many-body theory of strongly correlated systems, and topological condensed matter systems including both insulators and superconductors. He has contributed to research on quantum computing, decoherence mechanisms in nanostructures, many-body theory, and quantum transport. He has authored more than 50 refereed publications, and has given presentations at over 40 international conferences.

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