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Electron-electron interaction driven phenomena in carbon nanotube devices

Ethan Minot, Oregon State University
Thursday, November 2, 2017 - 12:30pm to 1:30pm
PAT C-520

Strong electron-electron
(e-e) interactions play an important role in determining the electrical and
optical properties of nanomaterials
. Our group uses individually-contacted
carbon nanotubes (CNTs) as a model experimental system to investigate the physics
and applications of these strong interactions. I will discuss: (1) The quantum
efficiency of CNT photodiodes,
1 (2) renormalization of the band gap
in semiconducting CNTs,
2 (3) the emergence of a Mott insulating
state in metallic CNTs. All three of these topics depend critically on the
strength of e-e interactions which we tune experimentally using dielectric
screening. We also gain new insights by using photocurrent spectroscopy to
precisely identify CNT diameter/chirality, and photocurrent microscopy to quantify
intrinsic region lengths.

1 Aspitarte, McCulley,
Minot, “Photocurrent Quantum Yield in
Suspended Carbon Nanotube PN Junctions” Nano
16, 5589 (2016)

​2 Aspitarte, McCulley,
Bertoni, Island, Ostermann, Rontani, Steele & Minot, “Giant modulation of
the electronic band gap of carbon nanotubes by dielectric screening”, Scientific Reports 7, 8828 (2017)