Material band structures of occupied electronic states are obtainable using conventional angle-resolved photoemission experiments, leaving the unoccupied states far less explored. Here, an alternative approach is built on and expanded to investigate thermalized photoelectrons emitted from crystal surfaces. A model for electron emission is constructed and reveals the material unoccupied state band structure. Potentially applicable to any material and independent from the secondary electron generation mechanism, it is demonstrated on diamond and copper using different light sources. Moreover, the diamond indirect band gap is directly observed and the transverse effective mass at the conduction band minimum can be experimentally obtained, mt = (0.21 ± 0.015) me. This offers a convenient path for angle-resolved photoemission data interpretation and empty-state information extraction.

Empty-State Band Mapping Using Momentum-Resolved Secondary Electron Emission

Cattelan M.
2021

Abstract

Material band structures of occupied electronic states are obtainable using conventional angle-resolved photoemission experiments, leaving the unoccupied states far less explored. Here, an alternative approach is built on and expanded to investigate thermalized photoelectrons emitted from crystal surfaces. A model for electron emission is constructed and reveals the material unoccupied state band structure. Potentially applicable to any material and independent from the secondary electron generation mechanism, it is demonstrated on diamond and copper using different light sources. Moreover, the diamond indirect band gap is directly observed and the transverse effective mass at the conduction band minimum can be experimentally obtained, mt = (0.21 ± 0.015) me. This offers a convenient path for angle-resolved photoemission data interpretation and empty-state information extraction.
File in questo prodotto:
File Dimensione Formato  
Adv Funct Materials - 2020 - Wan - Empty‐State Band Mapping Using Momentum‐Resolved Secondary Electron Emission.pdf

accesso aperto

Tipologia: Published (publisher's version)
Licenza: Creative commons
Dimensione 2.41 MB
Formato Adobe PDF
2.41 MB Adobe PDF Visualizza/Apri
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/3440501
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 4
  • ???jsp.display-item.citation.isi??? 4
  • OpenAlex ND
social impact