Electronic Structure and Optical Spectrum of Thick HgTe Colloidal Nanoplatelets
Metadatos
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INVESTIGACIONMetadatos
Título
Electronic Structure and Optical Spectrum of Thick HgTe Colloidal NanoplateletsFecha de publicación
2023-10-18Editor
American Chemical SocietyISSN
2330-4022Cita bibliográfica
Climente, J.; Szafran, B. Electronic Structure and Optical Spectrum of Thick HgTe Colloidal Nanoplatelets. ACS Photonics 2023, 10, 3763-3771. https://doi.org/10.1021/acsphotonics.3c00999Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
https://pubs.acs.org/doi/full/10.1021/acsphotonics.3c00999?casa_token=pertFudSHl ...Versión
info:eu-repo/semantics/acceptedVersionPalabras clave / Materias
Resumen
The electronic structure and optical transitions of HgTe nanoplatelets (NPLs) are calculated by means of an 8-band k·p Hamiltonian. We show that, for NPL thickness between the limits of strong confinement (∼1 nm) and ... [+]
The electronic structure and optical transitions of HgTe nanoplatelets (NPLs) are calculated by means of an 8-band k·p Hamiltonian. We show that, for NPL thickness between the limits of strong confinement (∼1 nm) and that of band gap collapse (∼6 nm), the photophysics is largely governed by the Γ6 – Γ8 band coupling. This leads to a nontrivial size dependence of the energy spectrum and charge distribution. A prominent effect is the formation of hybrid states in the conduction band, which evolve gradually from volume to surface localization as the thickness increases. This property enables controlled switching from direct to indirect exciton behavior without the need of using type-II heterostructures, which suppresses interband recombination. By contrast, intraband transition rates are enhanced. The small band gap of thick HgTe NPLs, together with the large binding energy of excitons, suggests that the excitonic insulator phase may be within reach. [-]
Publicado en
ACS Photonics, 2023, vol. 10, no 10Entidad financiadora
AGH University of Krakow | Ministerio de Ciencia e Innovación | Generalitat Valenciana
Identificador de la entidad financiadora
http://dx.doi.org/10.13039/501100011033
Código del proyecto o subvención
MCIN/PEICTI2021-2023/PID2021-128659NB-I00 | 22I235-CIPROM/2021/078
Derechos de acceso
http://rightsstatements.org/vocab/CNE/1.0/
info:eu-repo/semantics/embargoedAccess
info:eu-repo/semantics/embargoedAccess
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