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Charge and energy transport in mixed-dimensional systems: graphene, nanotubes, and graphene quantum dots

Laurel Anderson, Harvard University
Thursday, May 5, 2022 - 12:30pm to 1:25pm
PAB B421 (remote presentation)

Electronic confinement in low-dimensional systems generates exotic quantum states. I will discuss three experiments probing the unique physics of coupled 1D-2D and 0D-2D systems. In hybrid carbon nanotube-graphene heterostructures, we measured novel Coulomb drag behavior arising from the mixed-dimensional nature of the system, including possible hydrodynamic flow of graphene electrons generated by current in the nanotube. We separately observed unusual thermal transport in carbon nanotubes due to collective 1D electronic motion combined with long-range interactions. In ongoing experiments, we are studying thermoelectric transport through an etch-defined graphene quantum dot in a strong magnetic field, where the combination of quantum confinement and long-range disorder in the lowest Landau level is predicted to generate novel non-Fermi liquid behavior.

Laurel Anderson is a PhD student in Philip Kim's group in the Department of Physics at Harvard University. She received a B.A. in Physics from Dartmouth College and an MPhil in Physics from Cambridge University, with research on spin chain dynamics and spin-orbit torque. Her current experiments focus on electronic interactions in low-dimensional materials (primarily graphene and carbon nanotubes), probed by electrical transport measurements.

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