813 citations · 1.1k across the 18 of their papers we have counts for
18 papers
Observation of competing, correlated ground states in the flat band of rhombohedral graphite
Imre Hagymási, Mohammad Syahid Mohd Isa, Zoltán Tajkov +10
In crystalline solids the interactions of charge and spin can result in a variety of emergent quantum ground states, especially in partially filled, topological flat bands such as…
Possible inversion symmetry breaking in the pyrochlore Heisenberg magnet
Imre Hagymási, Robin Schäfer, Roderich Moessner +1
We address the ground-state properties of the long-standing and much-studied three-dimensional quantum spin liquid candidate, the pyrochlore Heisenberg antiferromagne…
Dynamical topological quantum phase transitions in nonintegrable models
I. Hagymási, C. Hubig, Ö. Legeza +1
We consider sudden quenches across quantum phase transitions in the XXZ model starting from the Haldane phase. We demonstrate that dynamical phase transitions may occur durin…
Entanglement and magnetism in high-spin graphene nanodisks
I. Hagymasi, O. Legeza
We investigate the ground-state properties of triangular graphene nanoflakes with zigzag edge configurations. The description of zero-dimensional nanostructures requires accurate m…
A magnetic phase-transition graphene transistor with tunable spin polarization
Peter Vancso, Imre Hagymasi, Levente Tapaszto
Graphene nanoribbons (GNRs) have been proposed as potential building blocks for field effect transistor (FET) devices due to their quantum confinement bandgap. Here, we propose a n…
Interaction effects in a chaotic graphene quantum billiard
Imre Hagymasi, Peter Vancso, Andras Palinkas +1
We investigate the local electronic structure of a Sinai-like, quadrilateral graphene quantum billiard with zigzag and armchair edges using scanning tunneling microscopy at room te…
Entanglement, excitations and correlation effects in narrow zigzag graphene nanoribbons
I. Hagymasi, O. Legeza
We investigate the low-lying excitation spectrum and ground-state properties of narrow graphene nanoribbons with zigzag edge configurations. Nanoribbons of comparable widths have b…
Characterization of a correlated topological Kondo insulator in one dimension
I. Hagymasi, O. Legeza
We investigate the ground-state of a p-wave Kondo-Heisenberg model introduced by Alexandrov and Coleman with an Ising-type anisotropy in the Kondo interaction and correlated conduc…
Momentum distribution functions in a one-dimensional extended periodic Anderson model
I. Hagymasi, J. Solyom, O. Legeza
We study the momentum distribution of the electrons in an extended periodic Anderson model, where the interaction, , between itinerant and localized electrons is taken into…
Competition between Hund's coupling and Kondo effect in a one-dimensional extended periodic Anderson model
I. Hagymasi, J. Solyom, O. Legeza
We study the ground-state properties of an extended periodic Anderson model to understand the role of Hund's coupling between localized and itinerant electrons using the density-ma…
Room temperature magnetic order on zigzag edges of narrow graphene nanoribbons
Gabor Zsolt Magda, Xiaozhan Jin, Imre Hagymasi +6
Magnetic order emerging in otherwise non-magnetic materials as carbon is a paradigmatic example of a novel type of s-p electron magnetism predicted to be of exceptional high-temper…
Interorbital interaction in the one-dimensional periodic Anderson model: A density-matrix renormalization-group study
I. Hagymasi, J. Solyom, O. Legeza
We investigate the effect of the Coulomb interaction, , between the conduction and f electrons in the periodic Anderson model using the density-matrix renormalization-group…
Quantum criticality and first-order transitions in the extended periodic Anderson model
I. Hagymasi, K. Itai, J. Solyom
We investigate the behavior of the periodic Anderson model in the presence of - Coulomb interaction () using mean-field theory, variational calculation, and exact dia…
Hubbard physics in the symmetric half-filled periodic Anderson-Hubbard model
I. Hagymasi, K. Itai, J. Solyom
Two very different methods -- exact diagonalization on finite chains and a variational method -- are used to study the possibility of a metal-insulator transition in the symmetric…
Periodic Anderson model with correlated conduction electrons: variational and exact diagonalization study
I. Hagymasi, K. Itai, J. Solyom
We investigate an extended version of the periodic Anderson model (the so-called periodic Anderson-Hubbard model) with the aim to understand the role of interaction between conduct…
Periodic Anderson model with d-f interaction
I. Hagymasi, K. Itai, J. Solyom
We investigate an extended version of the periodic Anderson model where an interaction is switched on between the doubly occupied d- and f-sites. We perform variational calculation…
Critical Josephson current in ballistic superconductor-graphene systems
I. Hagymási, A. Kormányos, J. Cserti
We calculate the phase, the temperature and the junction length dependence of the supercurrent for ballistic graphene Josephson-junctions. For low temperatures we find non-sinusoid…
Graphene Andreev Billiards
J. Cserti, I. Hagymasi, A. Kormanyos
We studied the energy levels of graphene based Andreev billiards consisting of a superconductor region on top of a monolayer graphene sheet. For the case of Andreev retro-reflectio…