Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session A34: Optical Spectroscopic Measurements of 2D Materials I
8:00 AM–11:00 AM,
Monday, March 6, 2023
Room: Room 226/227
Sponsoring
Unit:
FIAP
Chair: Nicholas Borys, Lawrence Berkeley National Laboratory
Abstract: A34.00009 : Ultrastrong Light-Matter Coupling with a single THz Split Ring Resonator and monolayer graphene*
9:36 AM–9:48 AM
Presenter:
Elsa Jöchl
(ETH Zürich)
Authors:
Elsa Jöchl
(ETH Zürich)
Jerome Faist
(ETH Zurich)
Giacomo Scalari
(ETH Zürich)
María Barra Burillo
(CIC nanoGUNE)
Shima Rajabali
(EPFL Lausanne)
Mattias Beck
(ETH Zürich)
Moving towards the single electron regime, we attempted to modify our conventional samples consisting of metamaterials with arrays of evenly spaced complementary split ring resonators (cSRRs). They intrinsically enhance electric fields at volumes much smaller than the illuminating wavelength, at resonant frequencies corresponding to their equivalent LC circuit. One of the possible modifications to couple only to a few electrons was to reduce the number of resonators down to a single meta-atom. However far field measurements of these samples did not show the expected resonant behavior, as the LC mode of the cSRR could not be excited. In our previous work (ref 1), we presented a solution to this problem: An asymmetric solid immersion lens (aSIL) setup where two Si lenses focus the THz beam onto the single resonator, exciting the desired LC resonant mode and making its far field resolution possible.
Having the possibility to probe a single resonator, rather than an array thereof, is very important as a first step towards measuring high-quality, exfoliated 2D materials like monolayer graphene. The material flakes are usually very small (∼20 · 20 μm) and sensitive during processing, thereby making it unfeasible to place them under multiple resonators on the same sample. Another imperative step towards measuring ultrastrong coupling (USC) between the electrons in a single layer graphene flake is being able to electrically contact the sample during the measurement to shift the Fermi level. As a first step for this we present the measurements of USC coupling to electrons in a gated GaAs-AlGaAs quantum well.
By placing a stack of monolayer graphene and hBN in the gap of the resonator and making use of the above mentioned components, we are therefore able to present the first optical measurement of electrons in graphene coupled to the mode of a single THz resonator.
*FNSNF (Swiss National Science Foundation)
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