Ahmet Keleş

E-mail

akeles@metu.edu.tr

Department

Department of Physics

ORCID

0000-0002-9367-3903

Scopus Author ID

23004875700

Web of Science Researcher ID

U-2932-2018

Vortex lattices in strongly confined quantum droplets Yoğurt, Taha Alper; Tanyeri, Umut; Keleş, Ahmet; Oktel, M.Ö. (2023-09-01) Bose mixture quantum droplets display a fascinating stability that relies on quantum fluctuations to prevent collapse driven by mean-field effects. Most droplet research focuses on untrapped or weakly trapped scenarios, wh...
Polarized Rabi-coupled and spinor boson droplets Yoğurt, Taha Alper; Keleş, Ahmet; Oktel, M.Ö. (2023-2-01) Self-bound quantum droplets form when the mean-field tendency of the gas to collapse is stabilized by the effectively repulsive beyond-mean-field fluctuations. The beyond-mean-field effects depend on Rabi frequency ωR and ...
Neural-network quantum states for a two-leg Bose-Hubbard ladder under magnetic flux Çeven, K.; Oktel, M. Ö.; Keleş, Ahmet (2022-12-01) Quantum gas systems are ideal analog quantum simulation platforms for tackling some of the most challenging problems in strongly correlated quantum matter. However, they also expose the urgent need for new theoretical fram...
Dimers, trimers, tetramers, and other multimers in a multiband Bose-Hubbard model Iskin, M.; Keleş, Ahmet (2022-10-01) We study the bound states of N identical bosons that are described by a multiband Bose-Hubbard model with generic hoppings and an attractive on-site interaction. Using a variational approach, we first derive exact integral...
Stability of (N+1) -body fermion clusters in a multiband Hubbard model Iskin, M.; Keleş, Ahmet (2022-9-01) We start with a variational approach and derive a set of coupled integral equations for the bound states of N identical spin-↑ fermions and a single spin-↓ fermion in a generic multiband Hubbard Hamiltonian with an attrac...
Spinor boson droplets stabilized by spin fluctuations Yoğurt, Taha Alper; Keleş, Ahmet; Oktel, M. Ö. (2022-04-01) Self-trapped droplets stabilized by quantum fluctuations have been experimentally realized in dipolar gases and binary boson mixtures. In this paper, we propose spinor Bose gases as another candidate for droplet formation....
Rise and fall of plaquette order in the Shastry-Sutherland magnet revealed by pseudofermion functional renormalization group Keleş, Ahmet; Zhao, Erhai (2022-01-01) The Shastry-Sutherland (SS) model as a canonical example of frustrated magnetism has been extensively studied. The conventional wisdom has been that the transition from the plaquette valence bond order to the Ned order is ...
f-wave superfluidity from repulsive interaction in Rydberg-dressed Fermi gas Keleş, Ahmet; 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 (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 (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...

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