Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session U51: Graphene: Imaging and Spectroscopy
2:30 PM–5:06 PM,
Thursday, March 5, 2020
Room: Mile High Ballroom 1D
Sponsoring
Unit:
DCP
Chair: Jennifer DeMell, Laboratory for Physical Sciences
Abstract: U51.00006 : THz spectroscopy of graphene and graphene nanoribbons using LaAlO3/SrTiO3 nanoscale junctions*
View Presentation
Abstract 
Presenter:
Erin Sheridan
(Physics & Astronomy, University of Pittsburgh)
Authors:
Erin Sheridan
(Physics & Astronomy, University of Pittsburgh)
Lu Chen
(National Institute of Standard and Technology)
Qing Guo
(Physics & Astronomy, University of Pittsburgh)
Jianan Li
(Physics & Astronomy, University of Pittsburgh)
Jung-Woo Lee
(Materials Science and Engineering, University of Wisconsin-Madison)
Chang-Beom Eom
(Materials Science and Engineering, University of Wisconsin-Madison)
Patrick Irvin
(Physics & Astronomy, University of Pittsburgh)
Jeremy Levy
(Physics & Astronomy, University of Pittsburgh)
We investigate the optical response of graphene and graphene nanoribbons using the broadband nonlinear generation and detection capabilities of nanoscale junctions created at the LaAlO3/SrTiO3 interface [1]. Using the large third-order nonlinear susceptibility in SrTiO3, strong difference frequency mixing occurs when the junction is biased, leading to induced polarization that can also be detected at the junction [2,3]. Here we discuss the results of experiments which interrogate the relationship between the THz signal and the gate location with respect to the Dirac point in devices where graphene is coupled to the LaAlO3/SrTiO3 interface. Results show near-100% extinction of VIS-NIR light in graphene, and suggest we may be detecting a surface plasmon resonance. Additional results on individual graphene nanoribbons reinforce this interpretation.
[1] C. Cen, et al., Nature Mat. 7, 298 (2008).
[2] Y. Ma, et al., Nano Lett 13, 2884 (2013).
[3] L. Chen, et al., Light: Sci. & Appl. 8, 24 (2019).
*J.Levy acknowledges a Vannevar Bush Faculty Fellowship (ONR N00014-15-1-2847), and the Office of Naval Research (N00014-16-1-3152). C-BE acknowledges support from AFOSR (FA9550-15-1-0334), NSF DMREF (DMR-1629270), and NSF MRSEC (DMR-1420645) (C-BE). ES acknowledges support from NSF GRFP (1747452).
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