Observation of well-defined Kohn-anomaly in high-quality graphene devices at room temperature

Gadelha, Andreij C.; Nadas, Rafael; Barbosa, Tiago C.; Watanabe, Kenji; Taniguchi, Takashi; Campos, Leonardo C.; Raschke, Markus B.; Jorio, Ado

doi:10.1088/2053-1583/ac8e7f

Observation of well-defined Kohn-anomaly in high-quality graphene devices at room temperature

Journal Article · 19 September 2022 · 2D Materials

DOI:https://doi.org/10.1088/2053-1583/ac8e7f· OSTI ID:2419845

^[1]; Nadas, Rafael; ; ; Taniguchi, Takashi; ; Raschke, Markus B.;

OSTI

Abstract

Due to its ultra-thin nature, the study of graphene quantum optoelectronics, like gate-dependent graphene Raman properties, is obscured by interactions with substrates and surroundings. For instance, the use of doped silicon with a capping thermal oxide layer limited the observation to low temperatures of a well-defined Kohn-anomaly behavior, related to the breakdown of the adiabatic Born–Oppenheimer approximation. Here, we design an optoelectronic device consisting of single-layer graphene electrically contacted with thin graphite leads, seated on an atomically flat hexagonal boron nitride substrate and gated with an ultra-thin gold layer. We show that this device is optically transparent, has no background optical peaks and photoluminescence from the device components, and no generation of laser-induced electrostatic doping (photodoping). This allows for room-temperature gate-dependent Raman spectroscopy effects that have only been observed at cryogenic temperatures so far, above all the Kohn-anomaly phonon energy normalization. The new device architecture, by decoupling graphene optoelectronic properties from the substrate effects, allows for observing quantum phenomena at room temperature.

Research Organization:: Univ. of Colorado, Boulder, CO (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: SC0008807

OSTI ID:: 2419845

Journal Information:: 2D Materials, Journal Name: 2D Materials Journal Issue: 4 Vol. 9; ISSN 2053-1583

Publisher:: IOP Publishing

Country of Publication:: United States

Language:: English

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