Non-equilibrium band broadening, gap renormalization and band inversion in black phosphorus
dc.contributor.author | Hedayat, H | |
dc.contributor.author | Ceraso, A | |
dc.contributor.author | Soavi, G | |
dc.contributor.author | Akhavan, S | |
dc.contributor.author | Cadore, A | |
dc.contributor.author | Dallera, C | |
dc.contributor.author | Cerullo, G | |
dc.contributor.author | Ferrari, A C | |
dc.contributor.author | Carpene, E | |
dc.date.accessioned | 2021-01-28T15:03:10Z | |
dc.date.available | 2021-01-28T15:03:10Z | |
dc.date.issued | 2021-01-28 | |
dc.date.submitted | 2020-10-05 | |
dc.identifier.other | tdmabd89a | |
dc.identifier.other | abd89a | |
dc.identifier.other | 2dm-106063.r1 | |
dc.identifier.uri | https://www.repository.cam.ac.uk/handle/1810/316817 | |
dc.description | Funder: ERC Grants Hetero2D | |
dc.description | Funder: GSYNCOR | |
dc.description | Funder: EU Graphene Flagship | |
dc.description.abstract | 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 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.language | en | |
dc.publisher | IOP Publishing | |
dc.rights | Attribution 4.0 International (CC BY 4.0) | en |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | en |
dc.subject | Paper | |
dc.subject | black phosphorus | |
dc.subject | time-resolved ARPES | |
dc.subject | Stark effect | |
dc.subject | surface photovoltage | |
dc.subject | bandgap renormalization | |
dc.title | Non-equilibrium band broadening, gap renormalization and band inversion in black phosphorus | |
dc.type | Article | |
dc.date.updated | 2021-01-28T15:03:10Z | |
prism.issueIdentifier | 2 | |
prism.publicationName | 2D Materials | |
prism.volume | 8 | |
dc.identifier.doi | 10.17863/CAM.63932 | |
dcterms.dateAccepted | 2021-01-05 | |
rioxxterms.versionofrecord | 10.1088/2053-1583/abd89a | |
rioxxterms.version | VoR | |
rioxxterms.licenseref.uri | http://creativecommons.org/licenses/by/4.0 | |
dc.contributor.orcid | Ferrari, A C [0000-0003-0907-9993] | |
dc.contributor.orcid | Carpene, E [0000-0003-3867-8178] | |
dc.identifier.eissn | 2053-1583 | |
pubs.funder-project-id | PRIN (2017BZPKSZ) | |
pubs.funder-project-id | EPSRC Grants (EP/K01711X/1) | |
pubs.funder-project-id | EPSRC Grants (EP/K017144/1, EP/L016087/1, EP/N010345/1) |
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