Anomalies at the Dirac Point in Graphene and Its Hole-Doped Compositions

Arindam Pramanik, Sangeeta Thakur, Bahadur Singh, Philip Willke, Martin Wenderoth, Hans Hofsäss, Giovanni Di Santo, Luca Petaccia, and Kalobaran Maiti
Phys. Rev. Lett. 128, 166401 – Published 18 April 2022
PDFHTMLExport Citation

Abstract

We study the properties of the Dirac states in SiC-graphene and its hole-doped compositions employing angle-resolved photoemission spectroscopy and density functional theory. The symmetry-selective measurements for the Dirac bands reveal their linearly dispersive behavior across the Dirac point which was termed as the anomalous region in earlier studies. No gap is observed even after boron substitution that reduced the carrier concentration significantly from 3.7×1013cm2 in SiC-graphene to 0.8×1013cm2 (5% doping). The anomalies at the Dirac point are attributed to the spectral width arising from the lifetime and momentum broadening in the experiments. The substitution of boron at the graphitic sites leads to a band renormalization and a shift of the Dirac point towards the Fermi level. The internal symmetries appear to be preserved in SiC-graphene even after significant boron substitutions. These results suggest that SiC-graphene is a good platform to realize exotic science as well as advanced technology where the carrier properties like concentration, mobility, etc., can be tuned keeping the Dirac fermionic properties protected.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Received 26 June 2021
  • Accepted 28 March 2022

DOI:https://doi.org/10.1103/PhysRevLett.128.166401

© 2022 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Arindam Pramanik1,*, Sangeeta Thakur1,2,*,†, Bahadur Singh1, Philip Willke3, Martin Wenderoth3, Hans Hofsäss4, Giovanni Di Santo2, Luca Petaccia2, and Kalobaran Maiti1,‡

  • 1Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005, India
  • 2Elettra Sincrotrone Trieste, Strada Statale 14 km 163.5, 34149 Trieste, Italy
  • 3IV. Physikalisches Institut, Georg-August-Universität Göttingen, 37077 Göttingen, Germany
  • 4II. Physikalisches Institut, Georg-August-Universität Göttingen, 37077 Göttingen, Germany

  • *These authors contributed equally to this work.
  • Present address: Freie Universität Berlin, Institut für Experimentalphysik Arnimallee 14, 14195 Berlin, Germany.
  • Corresponding author. kbmaiti@tifr.res.in

Article Text (Subscription Required)

Click to Expand

Supplemental Material (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 128, Iss. 16 — 22 April 2022

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review Letters

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×