Abstract

Two-dimensional metals, such as graphene, have been extensively explored, with graphene exhibiting a metallic response limited to the infrared spectral range. Extending the electron mobility in two-dimensional metals to achieve plasmonic behaviors in the visible range requires innovative synthesis procedures. In this study, we successfully realized the χ3 phase of borophene using chemical vapor deposition. Leveraging first-principle density-functional theory alongside advanced deep-subwavelength cathodoluminescence spectroscopy, we reveal the extreme anisotropic response of this material in the visible range, transitioning from hyperbolic polaritonic to an elliptic wavefront. Our calculations substantiate the experimental findings, positioning borophene as a candidate for the in-plane hyperbolic response in the visible range. These results open an avenue for optoelectronic applications in the visible spectrum, particularly through the incorporation of borophene into hybrid metallic-semiconducting heterostructures.

Abstract

Two-dimensional metals, such as graphene, have been extensively explored, with graphene exhibiting a metallic response limited to the infrared spectral range. Extending the electron mobility in two-dimensional metals to achieve plasmonic behaviors in the visible range requires innovative synthesis procedures. In this study, we successfully realized the χ3 phase of borophene using chemical vapor deposition. Leveraging first-principle density-functional theory alongside advanced deep-subwavelength cathodoluminescence spectroscopy, we reveal the extreme anisotropic response of this material in the visible range, transitioning from hyperbolic polaritonic to an elliptic wavefront. Our calculations substantiate the experimental findings, positioning borophene as a candidate for the in-plane hyperbolic response in the visible range. These results open an avenue for optoelectronic applications in the visible spectrum, particularly through the incorporation of borophene into hybrid metallic-semiconducting heterostructures.

Abstract

Two-dimensional metals, such as graphene, have been extensively explored, with graphene exhibiting a metallic response limited to the infrared spectral range. Extending the electron mobility in two-dimensional metals to achieve plasmonic behaviors in the visible range requires innovative synthesis procedures. In this study, we successfully realized the χ3 phase of borophene using chemical vapor deposition. Leveraging first-principle density-functional theory alongside advanced deep-subwavelength cathodoluminescence spectroscopy, we reveal the extreme anisotropic response of this material in the visible range, transitioning from hyperbolic polaritonic to an elliptic wavefront. Our calculations substantiate the experimental findings, positioning borophene as a candidate for the in-plane hyperbolic response in the visible range. These results open an avenue for optoelectronic applications in the visible spectrum, particularly through the incorporation of borophene into hybrid metallic-semiconducting heterostructures.

Abstract

Two-dimensional metals, such as graphene, have been extensively explored, with graphene exhibiting a metallic response limited to the infrared spectral range. Extending the electron mobility in two-dimensional metals to achieve plasmonic behaviors in the visible range requires innovative synthesis procedures. In this study, we successfully realized the χ3 phase of borophene using chemical vapor deposition. Leveraging first-principle density-functional theory alongside advanced deep-subwavelength cathodoluminescence spectroscopy, we reveal the extreme anisotropic response of this material in the visible range, transitioning from hyperbolic polaritonic to an elliptic wavefront. Our calculations substantiate the experimental findings, positioning borophene as a candidate for the in-plane hyperbolic response in the visible range. These results open an avenue for optoelectronic applications in the visible spectrum, particularly through the incorporation of borophene into hybrid metallic-semiconducting heterostructures.