Zobrazeno 1 - 10
of 33
pro vyhledávání: '"Hagymási, Imre"'
We study the phase diagram of the antiferromagnetic $J_1$-$J_2$ Heisenberg model on the pyrochlore lattice with $S=1$ spins at zero and finite temperatures. We use a combination of complementary state-of-the-art quantum many-body approaches such as d
Externí odkaz:
http://arxiv.org/abs/2405.12745
Publikováno v:
Phys. Rev. B 106, 235137 (2022)
We investigate the ground-state properties of the nearest-neighbor $S=1$ pyrochlore Heisenberg antiferromagnet using two complementary numerical methods, density-matrix renormalization group (DMRG) and pseudofermion functional renormalization group (
Externí odkaz:
http://arxiv.org/abs/2207.01642
Autor:
Hagymási, Imre, Isa, Mohammad Syahid Mohd, Tajkov, Zoltán, Márity, Krisztián, László, Oroszlány, Koltai, János, Alassaf, Assem, Kun, Péter, Kandrai, Konrád, Pálinkás, András, Vancsó, Péter, Tapasztó, Levente, Nemes-Incze, Péter
Publikováno v:
Science Advances 8, eabo6879 (2022)
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 Landau levels or in 'magic-angle' bilayer graphene. Much less explored
Externí odkaz:
http://arxiv.org/abs/2201.10844
Publikováno v:
Phys. Rev. B 106, L060411 (2022)
We study the $S=1/2$ pyrochlore Heisenberg antiferromagnet in a magnetic field. Using large scale density-matrix renormalization group (DMRG) calculations for clusters up to $128$ spins, we find indications for a finite triplet gap, causing a thresho
Externí odkaz:
http://arxiv.org/abs/2106.09722
Publikováno v:
Phys. Rev. Lett. 126, 117204 (2021)
We address the ground-state properties of the long-standing and much-studied three-dimensional quantum spin liquid candidate, the $S=\frac 1 2$ pyrochlore Heisenberg antiferromagnet. By using $SU(2)$ density-matrix renormalization group (DMRG), we ar
Externí odkaz:
http://arxiv.org/abs/2010.03563
Publikováno v:
Phys. Rev. B 102, 054408 (2020)
Frustrated three dimensional quantum magnets are notoriously impervious to theoretical analysis. Here we use a combination of three computational methods to investigate the three dimensional pyrochlore $S=1/2$ quantum antiferromagnet, an archetypical
Externí odkaz:
http://arxiv.org/abs/2003.04898
Publikováno v:
Phys. Rev. Materials 3, 094003 (2019)
Molybdenum disulfide nanoribbons with zigzag edges show ferromagnetic and metallic properties based on previous \emph{ab-initio} calculations. The investigation of the role of disorder on the magnetic properties is, however, still lacking due to the
Externí odkaz:
http://arxiv.org/abs/1906.00568
Publikováno v:
2D Materials 4, 024008 (2017)
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 novel GNR device concept, enabling the control of both charge and spin
Externí odkaz:
http://arxiv.org/abs/1702.02458
Publikováno v:
Phys. Rev. B 95, 075123 (2017)
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 temperature. It is revealed that besides the $(\sqrt{3}\times\sqrt{3})R3
Externí odkaz:
http://arxiv.org/abs/1701.08016
We add a Heisenberg interaction term $\propto\lambda$ in the one-dimensional SU(2)$\otimes$XY spin-orbital model introduced by B. Kumar. At $\lambda=0$ the spin and orbital degrees of freedom can be separated by a unitary transformation leading to an
Externí odkaz:
http://arxiv.org/abs/1503.04031