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Doctoral thesis
Open access
English

Electronic structure of exfoliated few-layer Black Phosphorus from micro-focus ARPES

ContributorsMargot, Florianorcid
Number of pages136
Imprimatur date2023-01-10
Defense date2022-12-16
Abstract

2D semiconducting materials represent an interesting opportunity for the desired scaling of electronic devices. Black phosphorus (PB) is a promising candidate because of its direct gap in the range of telecommunications wavelengths and a comparatively high room-temperature mobility that compares well with bulk Si. However, despite much transport and optical studies, little is known about its momentum-dependent electronic structure. In this thesis, I study the electronic structure of mechanically exfoliated BP using micro-focus angle-resolved photoemission spectroscopy (ARPES). My measurements unveil anisotropic quantum well states in the valence band. I characterize the full dispersion of the quantum well states in flakes of 2 – 9 monolayers thickness, quantify their effective mass and determine a single set of tight-binding parameters describing the experimental subband dispersion for all thicknesses. My data also reveals signatures of many-body interactions, which I characterize experimentally and study with different theoretical models.

eng
Keywords
  • Black phosphorus
  • ARPES
  • 2D materials
  • Quantum well states
  • Many-body physics
  • Electronics
  • electronic structure
  • DFT
  • encapsulation
  • micro-fabrication
  • models
  • exfoliation
  • tight-binding
Research group
Citation (ISO format)
MARGOT, Florian. Electronic structure of exfoliated few-layer Black Phosphorus from micro-focus ARPES. 2023. doi: 10.13097/archive-ouverte/unige:166484
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Technical informations

Creation01/26/2023 4:00:00 PM
First validation01/26/2023 4:00:00 PM
Update time03/16/2023 10:31:17 AM
Status update03/16/2023 10:31:14 AM
Last indexation02/01/2024 9:29:53 AM
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