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dc.contributor.authorHedayat, H
dc.contributor.authorCeraso, A
dc.contributor.authorSoavi, G
dc.contributor.authorAkhavan, S
dc.contributor.authorCadore, A
dc.contributor.authorDallera, C
dc.contributor.authorCerullo, G
dc.contributor.authorFerrari, A C
dc.contributor.authorCarpene, E
dc.date.accessioned2021-01-28T15:03:10Z
dc.date.available2021-01-28T15:03:10Z
dc.date.issued2021-01-28
dc.date.submitted2020-10-05
dc.identifier.othertdmabd89a
dc.identifier.otherabd89a
dc.identifier.other2dm-106063.r1
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/316817
dc.descriptionFunder: ERC Grants Hetero2D
dc.descriptionFunder: GSYNCOR
dc.descriptionFunder: EU Graphene Flagship
dc.description.abstractAbstract: 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.
dc.languageen
dc.publisherIOP Publishing
dc.rightsAttribution 4.0 International (CC BY 4.0)en
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en
dc.subjectPaper
dc.subjectblack phosphorus
dc.subjecttime-resolved ARPES
dc.subjectStark effect
dc.subjectsurface photovoltage
dc.subjectbandgap renormalization
dc.titleNon-equilibrium band broadening, gap renormalization and band inversion in black phosphorus
dc.typeArticle
dc.date.updated2021-01-28T15:03:10Z
prism.issueIdentifier2
prism.publicationName2D Materials
prism.volume8
dc.identifier.doi10.17863/CAM.63932
dcterms.dateAccepted2021-01-05
rioxxterms.versionofrecord10.1088/2053-1583/abd89a
rioxxterms.versionVoR
rioxxterms.licenseref.urihttp://creativecommons.org/licenses/by/4.0
dc.contributor.orcidFerrari, A C [0000-0003-0907-9993]
dc.contributor.orcidCarpene, E [0000-0003-3867-8178]
dc.identifier.eissn2053-1583
pubs.funder-project-idPRIN (2017BZPKSZ)
pubs.funder-project-idEPSRC Grants (EP/K01711X/1)
pubs.funder-project-idEPSRC Grants (EP/K017144/1, EP/L016087/1, EP/N010345/1)


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Attribution 4.0 International (CC BY 4.0)
Except where otherwise noted, this item's licence is described as Attribution 4.0 International (CC BY 4.0)