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Light–Matter Interaction in Quantum Confined 2D Polar Metals
Author(s) -
Nisi Katharina,
Subramanian Shruti,
He Wen,
Ulman Kanchan Ajit,
ElSherif Hesham,
Sigger Florian,
Lassaunière Margaux,
Wetherington Maxwell T.,
Briggs Natalie,
Gray Jennifer,
Holleitner Alexander W.,
Bassim Nabil,
Quek Su Ying,
Robinson Joshua A.,
Wurstbauer Ursula
Publication year - 2021
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202005977
Subject(s) - materials science , van der waals force , graphene , dielectric , metal , condensed matter physics , ellipsometry , chemical physics , molecular physics , nanotechnology , optoelectronics , physics , thin film , molecule , quantum mechanics , metallurgy
This work is a systematic experimental and theoretical study of the in‐plane dielectric functions of 2D gallium and indium films consisting of two or three atomic metal layers confined between silicon carbide and graphene with a corresponding bonding gradient from covalent to metallic to van der Waals type. k ‐space resolved free electron and bound electron contributions to the optical response are identified, with the latter pointing towards the existence of thickness dependent quantum confinement phenomena. The resonance energies in the dielectric functions and the observed epsilon near‐zero behavior in the near infrared to visible spectral range, are dependent on the number of atomic metal layers and properties of the metal involved. A model‐based spectroscopic ellipsometry approach is used to estimate the number of atomic metal layers, providing a convenient route over expensive invasive characterization techniques. A strong thickness and metal choice dependence of the light–matter interaction makes these half van der Waals 2D polar metals attractive for quantum engineered metal films, tunable (quantum‐)plasmonics and nano‐photonics.