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

Variational approach to the snake instability of a Bose-Einstein condensate soliton Tanyeri, U.; Gurkan, M. A.; Keleş, Ahmet; Oktel, M. O. (2026-01-01) Solitons are striking manifestations of nonlinearity, encountered in diverse physical systems such as water waves, nonlinear optics, and Bose-Einstein condensates (BECs). In BECs, dark solitons emerge as exact stationary s...
Vortex and fractional quantum Hall phases in a rotating anisotropic Bose gas Tanyeri, Umut; Kallushi, A.; Umucalilar, R. O.; Keleş, Ahmet (2025-08-01) Realizing fractional quantum Hall (FQH) states in ultracold atomic systems remains a major goal despite numerous experimental advances in the last few decades. Recent progress in trap anisotropy control under rapid rotatio...
Rotating anisotropic Bose gas with large number of vortices Keleş, Ahmet (2025-01-01) Rapidly rotating atomic gases provide a platform for studying phenomena akin to type-II superconductors and quantum Hall systems. Recently, these systems have attracted renewed interest due to technological advances in tra...
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 ...

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