Hamiltonian Inference from Dynamical Excitations in Confined Quantum Magnets
Loading...
Access rights
openAccess
URL
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
This publication is imported from Aalto University research portal.
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Date
2023-08-22
Department
Major/Subject
Mcode
Degree programme
Language
en
Pages
11
1-11
1-11
Series
Physical Review Applied, Volume 20, issue 2
Abstract
Quantum-disordered models provide a versatile platform to explore the emergence of quantum excitations in many-body systems. The engineering of spin models at the atomic scale with scanning tunneling microscopy and the local imaging of excitations with electrically driven spin resonance has risen as a powerful strategy to image spin excitations in finite quantum spin systems. Here, focusing on S=1/2 lattices as realized by Ti in MgO, we show that dynamical spin excitations provide a robust strategy to infer the nature of the underlying Hamiltonian. We show that finite-size interference of the dynamical many-body spin excitations of a generalized long-range Heisenberg model allows the underlying spin couplings to be inferred. We show that the spatial distribution of local spin excitations in Ti islands and ladders directly correlates with the underlying ground state in the thermodynamic limit. Using a supervised-learning algorithm, we demonstrate that the different parameters of the Hamiltonian can be extracted by providing the spatially dependent and frequency-dependent local excitations that can be directly measured by electrically driven spin resonance with scanning tunneling microscopy. Our results put forward local dynamical excitations in confined quantum spin models as versatile witnesses of the underlying ground state, providing an experimentally robust strategy for Hamiltonian inference in complex real spin models.Description
Keywords
Other note
Citation
Karjalainen, N, Lippo, Z, Chen, G, Koch, R, Otero Fumega, A & Lado, J 2023, ' Hamiltonian Inference from Dynamical Excitations in Confined Quantum Magnets ', Physical Review Applied, vol. 20, no. 2, 024054, pp. 1-11 . https://doi.org/10.1103/PhysRevApplied.20.024054