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Non-equilibrium band broadening, gap renormalization and band inversion in black phosphorus
- Source :
- 2D Materials, 2D materials (2021)., info:cnr-pdr/source/autori:Hamoon Hedayat, Arianna Ceraso, Giancarlo Soavi, Shahab Akhavan, Alisson Cadore, Claudia Dallera, Giulio Cerullo, Andrea C Ferrari and Ettore Carpene/titolo:Non-equilibrium Band Broadening, Gap Renormalization and Band Inversion in Black Phosphorus/doi:/rivista:2D materials/anno:2021/pagina_da:/pagina_a:/intervallo_pagine:/volume
- Publication Year :
- 2021
- Publisher :
- IOP Publishing, 2021.
-
Abstract
- Funder: ERC Grants Hetero2D<br />Funder: GSYNCOR<br />Funder: EU Graphene Flagship<br />Black phosphorous (BP) is a layered semiconductor with high carrier mobility, anisotropic optical response and wide bandgap tunability. In view of its application in optoelectronic devices, understanding transient photo-induced effects is crucial. Here, we investigate by time- and angle-resolved photoemission spectroscopy BP in its pristine state and in the presence of Stark splitting, chemically induced by Cs ad-sorption. We show that photo-injected carriers trigger bandgap renormalization, and a concurrent valence band flattening caused by Pauli blocking. In biased samples, photo-excitation leads to a long-lived (ns) surface photovoltage of few hundreds mV that counterbalances the Cs-induced surface band bending. This allows us to disentangle bulk from surface electronic states, and to clarify the mechanism underlying the band inversion observed in bulk samples.
- Subjects :
- Paper
Electron mobility
Materials science
balck phosphorus
Band gap
Photoemission spectroscopy
Stark effect
Surface photovoltage
FOS: Physical sciences
02 engineering and technology
time-resolved
black phosphorus
01 natural sciences
symbols.namesake
Pauli exclusion principle
Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
0103 physical sciences
General Materials Science
010306 general physics
bandgap renormalization
Condensed Matter - Materials Science
Condensed Matter - Mesoscale and Nanoscale Physics
Condensed matter physics
business.industry
Mechanical Engineering
Materials Science (cond-mat.mtrl-sci)
General Chemistry
surface photovoltage
021001 nanoscience & nanotechnology
Condensed Matter Physics
Photoexcitation
Semiconductor
Mechanics of Materials
time-resolved ARPES
symbols
0210 nano-technology
business
photoemission
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- 2D Materials, 2D materials (2021)., info:cnr-pdr/source/autori:Hamoon Hedayat, Arianna Ceraso, Giancarlo Soavi, Shahab Akhavan, Alisson Cadore, Claudia Dallera, Giulio Cerullo, Andrea C Ferrari and Ettore Carpene/titolo:Non-equilibrium Band Broadening, Gap Renormalization and Band Inversion in Black Phosphorus/doi:/rivista:2D materials/anno:2021/pagina_da:/pagina_a:/intervallo_pagine:/volume
- Accession number :
- edsair.doi.dedup.....d2975ae5617f6adf7182c7a012fd4ad2