Browsing by Author "Potasz, Pawel"

Now showing 1 - 3 of 3

Citation - WoS: 89
Graphene quantum dots preface
(Springer Verlag, 2014) Güçlü, Alev Devrim; Potasz, Pawel; Korkusinski, Marek; Hawrylak, Pawel; 04.05. Department of Pyhsics; 04. Faculty of Science; 01. Izmir Institute of Technology
[No abstract available]
Citation - WoS: 11
Citation - Scopus: 12
Prevalence of Oxygen Defects in an In-Plane Anisotropic Transition Metal Dichalcogenide
(American Physical Society, 2020) Plumadore, Ryan; Boddison-Chouinard, Justin; Lopinski, Gregory; Modarresi, Mohsen; Potasz, Pawel; Luican-Mayer, Adina; Başkurt, Mehmet; Şahin, Hasan; 04.04. Department of Photonics; 04. Faculty of Science; 01. Izmir Institute of Technology
Atomic scale defects in semiconductors enable their technological applications and realization of different quantum states. Using scanning tunneling microscopy and spectroscopy complemented by ab initio calculations we determine the nature of defects in the anisotropic van der Waals layered semiconductor ReS2. We demonstrate the in-plane anisotropy of the lattice by directly visualizing chains of rhenium atoms forming diamond-shaped clusters. Using scanning tunneling spectroscopy we measure the semiconducting gap in the density of states. We reveal the presence of lattice defects and by comparison of their topographic and spectroscopic signatures with ab initio calculations we determine their origin as oxygen atoms absorbed at lattice point defect sites. These results provide an atomic-scale view into the semiconducting transition metal dichalcogenides, paving the way toward understanding and engineering their properties.
Citation - WoS: 28
Citation - Scopus: 30
Wigner Crystallization in Topological Flat Bands
(IOP Publishing Ltd., 2018-06) Jaworowski, Blazej; Güçlü, Alev Devrim; Kaczmarkiewicz, Piotr; Kupczynski, Michal; Potasz, Pawel; Wójs, Arkadiusz; 04.05. Department of Pyhsics; 04. Faculty of Science; 01. Izmir Institute of Technology
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 of the pair correlation density of the many-body ground state obtained using exact diagonalization. The crystallization strength, measured by the magnitude of the Fourier peaks, increases with decreasing particle density. The Wigner crystallization observed by us is a robust and general phenomenon, existing in all three lattice models for a broad range of filling factors and interaction parameters. The shape of the resulting WCs is determined by the boundary conditions of the chosen plaquette. It is to a large extent independent on the underlying lattice, including its topology, and follows the behavior of classical point particles.