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Engineering 2D spin networks by on-surface encapsulation of azafullerene radicals in nanotemplates.
Nat Commun
January 2025
Faculty of Mathematics and Physics, University of Ljubljana, Ljubljana, Slovenia.
We present an efficient strategy for on-surface engineering of organic metal-free supramolecular complexes with long-term spin protection. By vacuum deposition of azafullerene (CN) monomers on a pre-deposited template layer of [10]cycloparaphenylene ([10]CPP) nanohoops on Au(111) surface we exploit the molecular shape matching between the CN and [10]CPP for the azafullerene encapsulation with nanohoops in a guest-host complexation geometry. CN⊂[10]CPP supramolecular complexes self-assemble into an extended two-dimensional hexagonal lattice yielding a high density network of stable spin-1/2 radicals.
View Article and Find Full Text PDFEmpowering deep neural quantum states through efficient optimization.
Nat Phys
July 2024
Center for Electronic Correlations and Magnetism, University of Augsburg, Augsburg, Germany.
Computing the ground state of interacting quantum matter is a long-standing challenge, especially for complex two-dimensional systems. Recent developments have highlighted the potential of neural quantum states to solve the quantum many-body problem by encoding the many-body wavefunction into artificial neural networks. However, this method has faced the critical limitation that existing optimization algorithms are not suitable for training modern large-scale deep network architectures.
View Article and Find Full Text PDFElucidating correlation-driven insulating state in an effective spin-½ antiferromagnet NdVO.
J Phys Condens Matter
September 2024
School of Physical Sciences, Indian Institute of Technology Mandi, Mandi 175075, Himachal Pradesh, India.
The= ½ state: a result of interplay of strong electronic correlations () with spin-orbit coupling (SOC) and crystal field splitting, offers a platform in the research of quantum materials. In this context, 4rare-earth based materials offer a fertile playground. Here, strong experimental and theoretical evidences for a= ½ state is established in a three-dimensional spin system NdVO.
View Article and Find Full Text PDFSpin-Charge-Lattice Coupling across the Charge Density Wave Transition in a Kagome Lattice Antiferromagnet.
Phys Rev Lett
July 2024
Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA.
Understanding spin and lattice excitations in a metallic magnetic ordered system forms the basis to unveil the magnetic and lattice exchange couplings and their interactions with itinerant electrons. Kagome lattice antiferromagnet FeGe is interesting because it displays a rare charge density wave (CDW) deep inside the antiferromagnetic ordered phase that interacts with the magnetic order. We use neutron scattering to study the evolution of spin and lattice excitations across the CDW transition T_{CDW} in FeGe.
View Article and Find Full Text PDFNumerical linked-cluster expansions for two-dimensional spin models with continuous disorder distributions.
Phys Rev E
May 2024
Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
We show that numerical linked cluster expansions (NLCEs) based on sufficiently large building blocks allow one to obtain accurate low-temperature results for the thermodynamic properties of spin lattice models with continuous disorder distributions. Specifically, we show that such results can be obtained computing the disorder averages in the NLCE clusters before calculating their weights. We provide a proof of concept using three different NLCEs based on L, square, and rectangle building blocks.
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