caa a22 4500 528794523 20200904030253.0 cr unu---uuuuu 180925s2018 xx s 000 0 eng (BORIS)oai:boris.unibe.ch:120079 620 ddc Nonlinear THz spectroscopy and simulation of gated graphene [Elektronische Daten] [Gregory Gäumann, I Crassee, N Numan, M Tamagnone, J R Mosig, J-M Poumirol, J-P Wolf, Thomas Feurer] publishedVersion openAccess eu-repo We studied the nonlinear optical properties of single layer graphene using high terahertz (THz) fields. With the use of a back gate and cooling down the sample to cryogenic temperatures we are able to spectrally probe the nonlinear THz properties of intrinsic to highly doped graphene. The carrier density strongly affects the nonlinear properties of graphene; in the low doping and high THz field regime, an increase of the transmission on the order of 4% is found in our experiments. At higher doping levels we observe a larger relative nonlinear response: the larger the doping in the single layer the larger the relative field induced increase in transmission becomes. In all experiments, the THz field is opposing the effect of the gate, but field effects are never larger than the doping effects. We use the thermodynamical model for a hot electron gas also used by Mics et al (2015 Nat. Commun. 6 7655) to simulate our data and study the effects of doping on the nonlinear properties of single layer graphene. We find that the highest carrier temperatures are obtained in low doped graphene. The model shows a good qualitative agreement with our data for high doping levels. Nevertheless our results demonstrate the limitation of the model for low doping levels. Our results are a road map for further explorations for the control of nonlinear light-matter interaction and functionalization of graphene layers in active THz devices in which carrier temperature and saturable absorption play a role. Gäumann Gregory joint author Crassee I. joint author Numan N. joint author Tamagnone M. joint author Mosig J R. joint author Poumirol J-M joint author Wolf J-P joint author Feurer Thomas joint author Journal of physics communications 2(6), 065016 Onlinezugriff via WWW text/html Gäumann, Gregory; Crassee, I; Numan, N; Tamagnone, M; Mosig, J R; Poumirol, J-M; Wolf, J-P; Feurer, Thomas (2018). Nonlinear THz spectroscopy and simulation of gated graphene. Journal of physics communications, 2(6), 065016. IOP Publishing Ltd. 10.1088/2399-6528/aacc9d <http://dx.doi.org/10.1088/2399-6528/aacc9d> BORIS BK010053 XK010053 XK010000 1 info:eu-repo/semantics/article boris PeerReviewed boris peerstatus BORIS BORIS BORIS info:eu-repo/semantics/article openAccess BORIS 856 42 Onlinezugriff via WWW text/html Gäumann, Gregory; Crassee, I; Numan, N; Tamagnone, M; Mosig, J R; Poumirol, J-M; Wolf, J-P; Feurer, Thomas (2018). Nonlinear THz spectroscopy and simulation of gated graphene. Journal of physics communications, 2(6), 065016. IOP Publishing Ltd. 10.1088/2399-6528/aacc9d <http://dx.doi.org/10.1088/2399-6528/aacc9d> BORIS 700 1- Gäumann Gregory joint author BORIS 700 1- Crassee I. joint author BORIS 700 1- Numan N. joint author BORIS 700 1- Tamagnone M. joint author BORIS 700 1- Mosig J R. joint author BORIS 700 1- Poumirol J-M joint author BORIS 700 1- Wolf J-P joint author BORIS 700 1- Feurer Thomas joint author BORIS 773 0- Journal of physics communications 2(6), 065016