Next-generation devices from classical and quantum nanomaterials

Seminar | March 20 | 4-5 p.m. | Soda Hall, HP Auditorium, 306 Soda Hall

 Arthur Barnard, Postdoctoral Fellow, Stanford University

 Electrical Engineering and Computer Sciences (EECS)

In this seminar, I will discuss two kinds of novel devices we build from classical and quantum nanomaterials: (1) nanoscale optoelectromechanical sensors and (2) ballistic graphene transistors. In both cases, we use these new devices to uncover emergent physical phenomena, paving the way for next-generation functional devices. In the first case, we pick up individual carbon nanotubes and couple them with electrostatic gates and optical cavities. With this architecture, we reveal surprising spectral dynamics obscured by existing measurement techniques and uncover a higher-than-anticipated quality factor in room temperature carbon nanotube resonators—demonstrating the feasibility of a new class of highly-tunable, low-power optomechanical device. In the second part of this seminar, I will explain how we control the flow of electrons in graphene. Drawing from intuitions in ballistic transport and light optics, we build electron collimators to study angularly dependent phenomena such as Klein tunneling and to control valley polarization with Moiré superlattice structures.

Arthur Barnard is a Nano- and Quantum Science and Engineering Postdoctoral Fellow at Stanford University. He is particularly interested in using interactions in nanomechanical systems and quantum materials to study and harness nonlinear and quantum phenomena in new nanoscale optical, electrical, and mechanical devices. Arthur received his BS, MS and PhD in Applied and Engineering Physics from Cornell University.

 jeanrichter@berkeley.edu, 510-643-8208