Non-equilibrium band broadening, gap renormalization and band inversion in black phosphorus
Authors
Hedayat, H
Ceraso, A
Soavi, G
Akhavan, S
Cadore, A
Dallera, C
Cerullo, G
Ferrari, AC
Carpene, E
Publication Date
2021Journal Title
2D MATERIALS
ISSN
2053-1583
Publisher
IOP Publishing
Volume
8
Issue
2
Language
en
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Hedayat, H., Ceraso, A., Soavi, G., Akhavan, S., Cadore, A., Dallera, C., Cerullo, G., et al. (2021). Non-equilibrium band broadening, gap renormalization and band inversion in black phosphorus. 2D MATERIALS, 8 (2) https://doi.org/10.1088/2053-1583/abd89a
Description
Funder: ERC Grants Hetero2D
Funder: GSYNCOR
Funder: EU Graphene Flagship
Abstract
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 attening caused by Pauli blocking. In the biased sample,
photoexcitation 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.
Keywords
Paper, black phosphorus, time-resolved ARPES, Stark effect, surface photovoltage, bandgap renormalization
Sponsorship
Engineering and Physical Sciences Research Council (EP/L016087/1)
European Commission Horizon 2020 (H2020) Future and Emerging Technologies (FET) (696656)
EPSRC (via University of Manchester) (R119256)
European Commission Horizon 2020 (H2020) Future and Emerging Technologies (FET) (785219)
European Research Council (842251)
Engineering and Physical Sciences Research Council (EP/G042357/1)
European Research Council (319277)
Engineering and Physical Sciences Research Council (EP/K01711X/1)
Engineering and Physical Sciences Research Council (EP/K017144/1)
European Commission Horizon 2020 (H2020) Future and Emerging Technologies (FET) (881603)
Identifiers
tdmabd89a, abd89a, 2dm-106063.r1
External DOI: https://doi.org/10.1088/2053-1583/abd89a
This record's URL: https://www.repository.cam.ac.uk/handle/1810/333031
Rights
Licence:
http://creativecommons.org/licenses/by/4.0
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