Details

Autor(en) / Beteiligte

• Brun, Boris
• Nguyen, Viet-Hung
• Moreau, Nicolas
• Somanchi, Sowmya
• Watanabe, Kenji
• Taniguchi, Takashi
• Charlier, Jean-Christophe
• Stampfer, Christoph
• Hackens, Benoit

Titel

Graphene Whisperitronics: Transducing Whispering Gallery Modes into Electronic Transport

Ist Teil von

• Nano letters, 2022-01, Vol.22 (1), p.128-134

Ort / Verlag

United States: American Chemical Society

Erscheinungsjahr

2022

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• When confined in circular cavities, graphene relativistic charge carriers occupy whispering gallery modes (WGMs) in analogy to classical acoustic and optical fields. The rich geometrical patterns of the WGMs decorating the local density of states offer promising perspectives to devise new disruptive quantum devices. However, exploiting these highly sensitive resonances requires the transduction of the WGMs to the outside world through source and drain electrodes, a yet unreported configuration. Here, we create a circular p–n island in a graphene device using a polarized scanning gate microscope tip and probe the resulting WGM signatures in in-plane electronic transport through the p–n island. Combining tight-binding simulations and the exact solution of the Dirac equation, we assign the measured device conductance features to WGMs and demonstrate mode selectivity by displacing the p–n island with respect to a constriction. This work therefore constitutes a proof of concept for graphene whisperitronic devices.