Zobrazeno 1 - 10
of 3 962
pro vyhledávání: '"A. Vojta"'
We study the phases and phase transitions of a disordered one-dimensional quantum $q$-state clock Hamiltonian using large-scale Monte Carlo simulations. Making contact with earlier results, we confirm that the clean, translational invariant version o
Externí odkaz:
http://arxiv.org/abs/2410.07640
We use two different methods, Monte Carlo sampling and variational inference (VI), to perform a Bayesian calibration of the effective-range parameters in ${}^3$He-${}^4$He elastic scattering. The parameters are calibrated to data from a recent set of
Externí odkaz:
http://arxiv.org/abs/2408.13250
Autor:
Fragkopoulou, Georgia, Vojta, Matthias
We study the effect of bond disorder in extended Heisenberg-Kitaev models on the honeycomb lattice, relevant for materials such as $\alpha$-RuCl$_3$, in the semiclassical limit using a combination of T-matrix and real-space spin-wave approaches. Focu
Externí odkaz:
http://arxiv.org/abs/2408.12656
Inspired by the program of discrete holography, we show that Jackiw-Teitelboim (JT) gravity on a hyperbolic tiling of Euclidean AdS$_2$ gives rise to an Ising model on the dual lattice, subject to a topological constraint. The Ising model involves an
Externí odkaz:
http://arxiv.org/abs/2407.06266
Publikováno v:
Phys. Rev. B 110, 125123 (2024)
We characterize, by means of large-scale fermion quantum Monte Carlo simulations, metallic and deconfined quantum phase transitions in a bilayer honeycomb model in terms of their quantum critical and finite-temperature properties.The model features t
Externí odkaz:
http://arxiv.org/abs/2406.17042
Publikováno v:
Phys. Rev. B 110, 014432 (2024)
We revisit the magnetic properties of the hexagonal ferrite PbFe$_{12-x}$Ga$_x$O$_{19}$. Recent experiments have reported puzzling dependencies of the ordering temperature and the saturation magnetization on the Ga concentration $x$. To explain these
Externí odkaz:
http://arxiv.org/abs/2405.17328
Autor:
Granqvist, Filip, Song, Congzheng, Cahill, Áine, van Dalen, Rogier, Pelikan, Martin, Chan, Yi Sheng, Feng, Xiaojun, Krishnaswami, Natarajan, Jina, Vojta, Chitnis, Mona
Federated learning (FL) is an emerging machine learning (ML) training paradigm where clients own their data and collaborate to train a global model, without revealing any data to the server and other participants. Researchers commonly perform experim
Externí odkaz:
http://arxiv.org/abs/2404.06430
Classical spin-liquids are paramagnetic phases which feature nontrivial patterns of spin correlations within their ground-state manifold whose degeneracy scales with system size. Often they harbor fractionalized excitations, and their low-energy fluc
Externí odkaz:
http://arxiv.org/abs/2403.10601
Autor:
Cônsoli, Pedro M., Vojta, Matthias
Altermagnetism, a type of magnetic order that combines properties of ferromagnets and antiferromagnets, has generated significant interest recently, in particular due to its potential spintronics applications. Here, we show that altermagnetic states,
Externí odkaz:
http://arxiv.org/abs/2402.18629
Publikováno v:
Phys. Rev. B 110, 024206 (2024)
We investigate the critical behavior and the dynamics of the amplitude (Higgs) mode close to the superfluid-insulator quantum phase transition in an amorphous system (i.e., a system subject to topological randomness). In particular, we map the two-di
Externí odkaz:
http://arxiv.org/abs/2402.13757