Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/5149
Title: Zero-energy states of graphene triangular quantum dots in a magnetic field
Authors: Güçlü, Alev Devrim
Potasz, P.
Hawrylak, P.
Keywords: Electronic structure of graphene
Triangular graphene quantum dots (TGQD)
Nanoscale materials
Magnetic fields
Issue Date: Oct-2013
Publisher: American Physical Society
Source: Güçlü, A.D., Potasz, P., and Hawrylak, P. (2013). Zero-energy states of graphene triangular quantum dots in a magnetic field. Physical Review B - Condensed Matter and Materials Physics, 88(15). doi:10.1103/PhysRevB.88.155429
Abstract: We present a tight-binding theory of triangular graphene quantum dots (TGQD) with zigzag edge and broken sublattice symmetry in an external magnetic field. The lateral size quantization opens an energy gap, and broken sublattice symmetry results in a shell of degenerate states at the Fermi level. We derive a semianalytical form for zero-energy states in a magnetic field and show that the shell remains degenerate in a magnetic field, in analogy to the zeroth Landau level of bulk graphene. The magnetic field closes the energy gap and leads to the crossing of valence and conduction states with the zero-energy states, modulating the degeneracy of the shell. The closing of the gap with increasing magnetic field is present in all graphene quantum dot structures investigated irrespective of shape and edge termination.
URI: https://doi.org/10.1103/PhysRevB.88.155429
http://hdl.handle.net/11147/5149
ISSN: 1098-0121
1098-0121
1550-235X
Appears in Collections:Physics / Fizik
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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