Haidekker Galambos Tamás


Department of Physics
University of Basel
Klingelbergstrasse 82
CH-4056 Basel, Switzerland

email:view address


Short CV

2017-present: Ph.D. student in the Condensed Matter Theory & Quantum Computing group at the University of Basel, supervisors: Prof. Klinovaja and Prof. Loss
2017: Diplome d´Ingénieur des Arts et Manufactures (Ecole Centrale Paris, ECP)
2016/2017: Master's Thesis at BME: Development of Path Integral Monte Carlo simulations in magnetic field, Supervisor: Dr. Tőke Csaba
2015-2017: M.Sc. in Physics at the Budapest University of Technology and Economics (BME), Budapest, Hungary
2014/2015: Bachelor's Thesis at BME: A simple application of the Path Integral Monte Carlo method, Supervisor: Dr. Tőke Csaba
2012-2014: Double Degree Programme (T.I.M.E.) at Ecole Centrale Paris (ECP), Paris, France
2010-2015: B.Sc. in Physics at the Budapest University of Technology and Economics (BME), Budapest, Hungary


Show all abstracts.

1.  Path-integral Monte Carlo study of electronic states in quantum dots in an external magnetic field
Csaba Toke and Tamas Haidekker Galambos.
Phys. Rev. B 100, 165136 (2019); arXiv:1905.07802.

We explore the correlated electron states in harmonically confined few-electron quantum dots in an external magnetic field by the path-integral Monte Carlo method for a wide range of the field and the Coulomb interaction strength. Using the phase structure of a preceding unrestricted Hartree-Fock calculation for phase fixing, we find a rich variety of correlated states, often completely different from the prediction of mean-field theory. These are finite temperature results, but sometimes the correlations saturate with decreasing temperature, providing insight into the ground-state properties.

2.  Path-integral Monte Carlo simulation of time-reversal noninvariant bulk systems with a case study of rotating Yukawa gases
Tamas Haidekker Galambos and Csaba Toke.
Phys. Rev. E 97, 022140 (2018); arXiv:1702.01710.

We elaborate on the methodology to simulate bulk systems in the absence of time-reversal symmetry by the phase-fixed path-integral Monte Carlo method under (possibly twisted) periodic boundary conditions. Such systems include two-dimensional electrons in the quantum Hall regime and rotating ultracold Bose and Fermi gases; time-reversal symmetry is broken by an external magnetic field and the Coriolis force, respectively. We provide closed-form expressions in terms of Jacobi elliptic functions for the thermal density matrix (or the Euclidean propagator) of a single particle on a flat torus under very general conditions. We then modify the multislice sampling method in order to sample paths by the magnitude of the complex-valued thermal density matrix. Finally, we demonstrate that these inventions let us study the vortex melting process of a two-dimensional Yukawa gas in terms of the de Boer interaction strength parameter, temperature, and rotation (Coriolis force). The bosonic case is relevant to ultracold Fermi-Fermi mixtures of widely different masses under rotation.