Electron-electron interactions in graphene field-induced quantum dots in a high magnetic field
2015 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 92, no 7, 075431- p.Article in journal (Refereed) Published
We study the effect of electron-electron interaction in graphene quantum dots defined by an external electrostatic potential and a high magnetic field. To account for the electron-electron interaction, we use the Thomas-Fermi approximation and find that electron screening causes the formation of compressible strips in the potential profile and the electron density. We numerically solve the Dirac equations describing the electron dynamics in quantum dots, and we demonstrate that compressible strips lead to the appearance of plateaus in the electron energies as a function of the magnetic field. Finally, we discuss how our predictions can be observed using the Kelvin probe force microscope measurements.
Place, publisher, year, edition, pages
American Physical Society , 2015. Vol. 92, no 7, 075431- p.
Mathematics Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:liu:diva-121107DOI: 10.1103/PhysRevB.92.075431ISI: 000359859900004OAI: oai:DiVA.org:liu-121107DiVA: diva2:851803
Funding Agencies|Danish National Research Foundation [DNRF58]2015-09-072015-09-072015-09-09