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Browsing by Author "Güçlü, Alev Devrim"
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Disorder induced electronic and magnetic properties of graphene quantum dots
Kul, Erdoğan Kul (Izmir Institute of Technology, 201907)In this thesis, we aim to study magnetic properties of hexagonal shaped graphene quantum dots with armchair edge in the case of atomic collapse by modelling two vacancies on it. The measured relativistic electron transport ... 
Effects of interedge scattering on the Wigner crystallization in graphene nanoribbons
Modarresi, Mohsen; Güçlü, Alev Devrim (American Physical Society, 201706)We investigate the effects of coupling between the two zigzag edges of graphene nanoribbons on the Wigner crystallization of electrons and holes using a combination of tightbinding, meanfield Hubbard and manybody ... 
Effects of longrange disorder and electronic interactions on the optical properties of graphene quantum dots
Altıntaş, Abdulmenaf; Çakmak, K. E.; Güçlü, Alev Devrim (American Physical Society, 201701)We theoretically investigate the effects of longrange disorder and electronelectron interactions on the optical properties of hexagonal armchair graphene quantum dots consisting of up to 10 806 atoms. The numerical ... 
Effects of random atomic disorder on electronic and magnetic properties of graphene nanoribbons
Çakmak, Korhan Ertan (Izmir Institute of Technology, 201807)In this thesis, We investigate the effects of randomly distributed atomic defects on the magnetic and electronic properties of graphene nanoribbons with zigzag edges using an extended meanfield Hubbard model. We show that ... 
Electronelectron interactions and topology in the electronic properties of gated graphene nanoribbon rings in Möbius and cylindrical configurations
Güçlü, Alev Devrim; Grabowski, Marek; Hawrylak, Pawel (American Physical Society, 201301)We present a theory of the electronic properties of gated graphene nanoribbon rings with zigzag edges in Möbius and cylindrical configurations. The finite width opens a gap and nontrivial topology of the Möbius ring leads ... 
Electronic, magnetic and optical properties of disordered graphene quantum dots
Altıntaş, Abdulmenaf (Izmir Institute of Technology, 201807)In this thesis, we theoretically investigate electronic, magnetic and optical properties of disordered graphene quantum dots. The numerical calculations are performed using a combination of tightbinding, meanfield ... 
Electronic, magnetic and optical properties of graphene nanoribbons
Özdemir, Hakan Ulaş (Izmir Institute of Technology, 201606)In this thesis, electronic, magnetic and optical properties of graphene nanoribbons are investigated within meanfield Hubbard model with two different disorder type; long and short range in finite and cyclic topology. ... 
Graphenebased integrated electronic, photonic and spintronic circuit
Potasz, P.; Güçlü, Alev Devrim; Özfidan, Işıl; Korkusinski, Marek; Hawrylak, Pawel (SPIE, 2013)To create carbonbased nanoscale integrated electronic, photonic, and spintronic circuit one must demonstrate the three functionalities in a single material, graphene quantum dots (GQDs), by engineering lateral size, shape, ... 
Magnetic phases of graphene nanoribbons under potential fluctuations
Özdemir, Hakan Ulaş; Altıntaş, Abdulmenaf; Güçlü, Alev Devrim (American Physical Society, 20160112)We investigate the effects of longrange potential fluctuations and electronelectron interactions on the electronic and magnetic properties of graphene nanoribbons with zigzag edges using an extended meanfield Hubbard ... 
Microscopic theory of the optical properties of colloidal graphene quantum dots
Özfidan, Işıl; Korkusiński, Marek; Güçlü, Alev Devrim; Mcguire, John A.; Hawrylak, Pawel (American Physical Society, 201402)We present a microscopic theory of electronic and optical properties of colloidal graphene quantum dots (CGQDs). The singleparticle properties are described in the tightbinding model based on the pz carbon orbitals. ... 
Spinspin correlations of magnetic adatoms on graphene
Güçlü, Alev Devrim; Bulut, Nejat (American Physical Society, 20150303)We study the interaction between two magnetic adatom impurities in graphene using the Anderson model. The twoimpurity Anderson Hamiltonian is solved numerically by using the quantum Monte Carlo technique. We find that the ... 
Sublattice engineering and voltage control of magnetism in triangular single and bilayer graphene quantum dots
Güçlü, Alev Devrim; Potasz, P.; Hawrylak, Pawel (Wiley, 201601)When a Dirac electron is confined to a triangular graphene quantum dot with zigzag edges, its lowenergy spectrum collapses to a shell of degenerate states at the Fermi level leading to a magnetized edge. The shell degeneracy ... 
Theory of optical properties of graphene quantum dots
Özfidan, Işıl; Güçlü, Alev Devrim; Korkusinski, Marek; Hawrylak, Pawel (Wiley, 201601)We present here a theory of the optical properties of graphene quantum dots (GQDs) with tunable band gaps by lateral size confinement, from UV to THz. Starting from the HartreeFock ground state, we construct the correlated ... 
Wigner crystallization at graphene edges
Güçlü, Alev Devrim (American Physical Society, 20160112)Using manybody configuration interaction techniques, we show that Wigner crystallization occurs at the zigzag edges of graphene at surprisingly high electronic densities up to 0.8nm1. In contrast with onedimensional ... 
Wigner crystallization in topological flat bands
Jaworowski, Błażej; Güçlü, Alev Devrim; Kaczmarkiewicz, Piotr; Kupczyński, Michał; Potasz, Paweł; Wójs, Arkadiusz (Institute of Physics Publishing, 201806)We study the Wigner crystallization on partially filled topological flat bands of kagome, honeycomb and checkerboard lattices. We identify the Wigner crystals (WCs) by analyzing the Cartesian and angular Fourier transform ... 
Zeroenergy states of graphene triangular quantum dots in a magnetic field
Güçlü, Alev Devrim; Potasz, P.; Hawrylak, P. (American Physical Society, 201310)We present a tightbinding 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 ...