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Ahmet Keleş

E-mail
akeles@metu.edu.tr
Department
Department of Physics
Web of Science Researcher ID
f-wave superfluidity from repulsive interaction in Rydberg-dressed Fermi gas
Keleş, Ahmet; Zhao, Erhai; Li, Xiaopeng (2020-02-01)
Interacting Fermi gas provides an ideal model system to understand unconventional pairing and intertwined orders relevant to a large class of quantum materials. Rydberg-dressed Fermi gas is a recent experimental system whe...
Weyl nodes in periodic structures of superconductors and spin-active materials
Keleş, Ahmet; Zhao, Erhai (The Royal Society, 2018-08-01)
Motivated by recent progress in epitaxial growth of proximity structures of s-wave superconductors (S) and spin-active materials (M), in this paper we show that certain periodic structures of S and M can behave effectively...
Renormalization group analysis of dipolar Heisenberg model on square lattice
Keleş, Ahmet; Zhao, Erhai (2018-06-01)
We present a detailed functional renormalization group analysis of spin-1/2 dipolar Heisenberg model on square lattice. This model is similar to the well-known J(1)-J(2) model and describes the pseudospin degrees of freedo...
Absence of Long-Range Order in a Triangular Spin System with Dipolar Interactions
Keleş, Ahmet; Zhao, Erhai (2018-05-01)
The antiferromagnetic Heisenberg model on the triangular lattice is perhaps the best known example of frustrated magnets, but it orders at low temperatures. Recent density matrix renormalization group (DMRG) calculations f...
Effective theory of interacting fermions in shaken square optical lattices
Keleş, Ahmet; Zhao, Erhai; Liu, W. Vincent (2017-06-01)
We develop a theory of weakly interacting fermionic atoms in shaken optical lattices based on the orbital mixing in the presence of time-periodic modulations. Specifically, we focus on fermionic atoms in a circularly shake...
Competing many-body instabilities in two-dimensional dipolar Fermi gases
Keleş, Ahmet; Zhao, Erhai (2016-09-01)
Experiments on quantum degenerate Fermi gases of magnetic atoms and dipolar molecules begin to probe their broken-symmetry phases dominated by the long-range, anisotropic dipole-dipole interaction. Several candidate phases...
Mott transition in a two-leg Bose-Hubbard ladder under an artificial magnetic field
Keleş, Ahmet; Oktel, M. O. (2015-01-01)
We consider the Bose-Hubbard model on a two-leg ladder under an artificial magnetic field and investigate the superfluid-to-Mott insulator transition in this setting. Recently, this system has been experimentally realized ...
Theory of disordered unconventional superconductors
Keleş, Ahmet; Andreev, A. V.; Spivak, B. Z.; Kivelson, S. A. (2014-12-01)
In contrast to conventional s-wave superconductivity, unconventional (e.g., p- or d-wave) superconductivity is strongly suppressed even by relatively weak disorder. Upon approaching the superconductormetal transition, the ...
Electron transport in p-wave superconductor-normal metal junctions
Keleş, Ahmet; Andreev, A. V.; Spivak, B. Z. (2014-01-01)
We study low-temperature electron transport in p-wave superconductor-insulator-normal metal junctions. In diffusive metals, the p-wave component of the order parameter is strongly suppressed at distances greater than the m...
Ground-state properties, vortices, and collective excitations in a two-dimensional Bose-Einstein condensate with gravitylike interatornic attraction
Keleş, Ahmet; Sevincli, S.; Tanatar, B. (American Physical Society (APS), 2008-05-01)
We study the ground-state properties of a Bose-Einstein condensate with short-range repulsion and gravitylike 1 /r interatomic attraction in two-dimensions (2D). Using the variational approach we obtain the ground-state en...