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Article Dans Une Revue Nano Letters Année : 2020

Ultrasensitive Photoresponse of Graphene Quantum Dots in the Coulomb Blockade Regime to THz Radiation

Elisa Riccardi
Sylvain Massabeau
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Simon Messelot
Jérôme Tignon
Sukhdeep Dhillon
Robson Ferreira
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Sebastien Balibar
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Juliette Mangeney
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Résumé

Graphene quantum dots (GQDs) have recently attracted considerable attention, with appealing properties for terahertz (THz) technology. This includes the demonstration of large thermal bolometric effects in GQDs when illuminated by THz radiation. However, the interaction of THz photons with GQDs in the Coulomb blockade regime, i.e., single electron transport regime, remains unexplored. Here, we demonstrate the ultrasensitive photoresponse to THz radiation (from <0.1 to 10 THz) of a hBN-encapsulated GQD in the Coulomb blockade regime at low temperature (170 mK). We show that THz radiation of ∼10 pW provides a photocurrent response in the nanoampere range, resulting from a renormalization of the chemical potential of the GQD of ∼0.15 meV. We attribute this photoresponse to an interfacial photogating effect. Furthermore, our analysis reveals the absence of thermal effects, opening new directions in the study of coherent quantum effects at THz frequencies in GQDs.
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Dates et versions

hal-03013897 , version 1 (13-12-2023)

Identifiants

Citer

Elisa Riccardi, Sylvain Massabeau, Federico Valmorra, Simon Messelot, Michael Rosticher, et al.. Ultrasensitive Photoresponse of Graphene Quantum Dots in the Coulomb Blockade Regime to THz Radiation. Nano Letters, 2020, 20 (7), pp.5408-5414. ⟨10.1021/acs.nanolett.0c01800⟩. ⟨hal-03013897⟩
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