University of Illinois Urbana-Champaign

Electron-phonon interactions in double layer graphene superfluids

Estrada, Zachary

Content Files
Estrada_Zachary.pdf

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https://hdl.handle.net/2142/34248

Description

Title
Electron-phonon interactions in double layer graphene superfluids
Author(s)
Estrada, Zachary
Issue Date
2012-09-18T21:07:50Z
Director of Research (if dissertation) or Advisor (if thesis)
Gilbert, Matthew J.
Department of Study
Electrical & Computer Eng
Discipline
Electrical & Computer Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Date of Ingest
2012-09-18T21:07:50Z
Keyword(s)
  • Phonons
  • Bose-Einstein Condensation
  • non-equilibrium Green's function (NEGF)
Abstract
As the scaling of electronic devices continues to decrease, the search for a low- power replacement for complementary metal-oxide semiconductor (CMOS) logic becomes increasingly important. A predicted room temperature phase transition from Fermi liquid to Bose-Einstein condensate of excitons in double layer graphene has potential for use in ultra-low power device applications. These devices operate based on coherent interlayer transport and could far outperform traditional CMOS devices both in switching speed and power efficiency. When examining the possibility of a room-temperature exciton condensate, it is important to consider the scattering of charge carriers by phonons in each of the constituent graphene monolayers. We use the non- equilibrium Green’s function (NEGF) formalism to examine the effect that carrier-phonon scattering has on transport in such a device. The simulations show that the effect of carrier-phonon scattering has a strong dependence on the device coherence length, the maximum distance that individual electrons or holes may travel into the gapped superfluid region.
Graduation Semester
2012-08
Permalink
http://hdl.handle.net/2142/34248
Copyright and License Information
Copyright 2012 Zachary J. Estrada

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