Mehmet Tomak

E-mail

tomak@metu.edu.tr

Department

Scopus Author ID

7004930120

Exciton related nonlinear optical properties of a quantum wire Ustoglu Unal, V.; Tomak, Mehmet; Zorlu, O.; Aksahin, E. (2024-02-15) A considerable amount of work is done on nonlinear optical properties in quantum wells and dots. However, relatively fewer work is done on both quantum well wires and the excitonic effects. This work analyzes the excitonic...
Nonlinear Optical Properties of Low Dimensional Quantum Systems Unal, V. Ustoglu; Tomak, Mehmet; Aksahin, E.; Zorlu, O. (2022-01-01) Low dimensional semiconductor structures such as quantum wells, wires and dots demonstrate interesting nonlinear optical properties. The low dimensionality modulates the electronic structure leading to distinct nonlinear o...
Exciton related nonlinear optical properties of a spherical quantum dot Aksahin, E.; Unal, V. Ustoglu; Tomak, Mehmet (2015-11-01) The nonlinear optical properties of an exciton in a spherical quantum dot (QD) is studied analytically. The nonlinear optical coefficients are calculated within the density matrix formalism. The electronic problem is solve...
Adsorption of RuSex (x=1-5) cluster on Se-doped graphene: First principle calculations AKTÜRK, OLCAY ÜZENGİ; Tomak, Mehmet (2015-08-30) We have investigated the adsorption of RuSex (x =1-5) cluster on Se-doped graphene. The change of the adsorption energy with the number of Se atoms and magnetization values are investigated. Electronic properties of adsorp...
Study of the a-Si:H/c-Si Heterointerface by Ex-Situ Spectroscopic Ellipsometry, Infrared Spectroscopy, and Solar Cell Modeling Pehlivan, O.; KARATAŞ, SERÇİN; Yilmaz, O.; Kodolbas, A. O.; Duygulu, O.; DUYGULU, Nilüfer; İSKENDER, İRES; Tomak, Mehmet (2015-06-01) The interface formation between plasma-enhanced chemical vapor-deposited (PECVD) silicon thin films and H-terminated, p-type c-Si was investigated. The formation of hydrogenated amorphous silicon (a-Si:H), epitaxial Si, an...
Exciton related optical absorption in a spherical quantum dot Aksahin, Ertan; Unal, Vildan Ustoglu; Tomak, Mehmet (2014-11-10) An exciton in a spherical quantum dot is studied analytically within the effective mass approximation. A parabolic confinement under an electric field is considered. The linear and nonlinear optical absorption coefficients...
Spin–orbit effects on the nonlinear optical properties of a quantum dot in simultaneous electric and magnetic fields Aytekin, O.; Turgut, Sadi; Tomak, Mehmet (Elsevier BV, 2014-11) We report on the nonlinear optical properties of a quantum dot including the Rashba spin-orbit interaction (RSOI) with external electric and magnetic fields. The effect of dot size is considered. We do not make any assumpt...
Electronic and geometric structure of AuxCuy clusters studied by density functional theory KADIOĞLU, YELDA; AKTÜRK, OLCAY ÜZENGİ; Tomak, Mehmet (2014-06-01) We have determined the stable structures of AuCun, Au2Cun, Au3Cun and AuxCu8-x clusters. It has been observed that AuCun, Au2Cun and Au3Cun systems have two-dimensional (2D) structures up to six atoms and they become three...
Nonlinear optical properties of a Woods-Saxon quantum dot under an electric field AYTEKİN, ÖZLEM; Turgut, Sadi; Unal, V. Ustoglu; Aksahin, E.; Tomak, Mehmet (Elsevier BV, 2013-12-01) A theoretical study of the effect of the confining potential on the nonlinear optical properties of two dimensional quantum dots is performed. A three-parameter Woods-Saxon potential is used within the density matrix forma...
Structural and Interfacial Properties of Large Area n-a-Si:H/i-a-Si:H/p-c-Si Heterojunction Solar Cells Pehlivan, Ozlem; Menda, Deneb; Yilmaz, Okan; Kodolbas, Alp Osman; Ozdemir, Orhan; Duygulu, Ozgur; Kutlu, Kubilay; Tomak, Mehmet (2013-08-26) Large area (72 cm(2)) doping inversed HIT solar cells (n-a-Si:H/i-a-Si:H/p-c-Si) were investigated by High Resolution Transmission Electron Microscopy (HR-TEM), Spectroscopic Ellipsometry (SE), Fourier Transform Infrared A...

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