Extremely long-lived magnetic excitations in supported Fe chains

Gauyacq, J.P.; Lorente, Nicolás

doi:10.1103/physrevb.94.045420

Cited by 8 publications

(7 citation statements)

References 54 publications

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“…The skyrmion state is then stable when it is the ground state but also when it is an excited state. However, the system described by equation ( 1) is not alone in space; the spin structure in figure 1 is adsorbed on a metal surface and the inelastic collision of an electron from the substrate on one of the structure sites can induce a transition from the upper state to the lower state (electron-hole pair creation) and is responsible for the finite lifetime of the excited state (see a discussion of the decay rate induced by electron-hole pair creation in [50,59] and the application to spin decay in [60][61][62][63]). This process can involve thermally excited electrons but the decay is already present at vanishing temperature.…”

Section: Stability Of the Skyrmion And Ferromagnetic Structuresmentioning

confidence: 99%

A model for individual quantal nano-skyrmions

Gauyacq

Lorente

2019

J. Phys.: Condens. Matter

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A quantal model description of a discrete localized skyrmion singularity embedded in a ferromagnetic environment is proposed. It allows discussing the importance of various parameters in the appearance of a quantal skyrmion singularity. Analysis of the skyrmion reveals a few specific quantal properties: presence of a whole series of skyrmion states, nonclassical nature of the local spins, presence of superposition states and presence of extraskyrmion states due to the quantization of the central spin of the singularity. The interaction of an electron, tunneling or substrate, with the skyrmion is also described allowing a new view at the origin of the skyrmion stability as well as the possibility to discriminate between ferromagnetic and skyrmion phase in an Inelastic Electron Tunneling Spectroscopy (IETS) experiment, based on the skyrmion quantal properties.

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Section: Stability Of the Skyrmion And Ferromagnetic Structuresmentioning

confidence: 99%

A model for individual quantal nano-skyrmions

Gauyacq

Lorente

2019

J. Phys.: Condens. Matter

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“…As we have already noted, a thin insulating layer of Cu 2 N on Cu(001) significantly reduces decoherence in atomic-scale nanostructures and spin entanglement was detected at low temperatures 24,45 . Very long lifetime of spin states for antiferromagnetic chains on a Cu 2 N was found in experiments and explained by entanglement of spins in chains 46,47 . Additionally, in antiferromagnetically coupled quantum spin chains, studied in the present work, the stability of spin entanglement against thermal noise can be significantly enhanced by engineering of single-modulus parameters 22 .…”

Section: Resultsmentioning

confidence: 81%

Engineering of entanglement and spin state transfer via quantum chains of atomic spins at large separations

Бажанов

Sivkov

Stepanyuk

2018

Sci Rep

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Several recent experiments have shown that long-range exchange interactions can determine collective magnetic ground states of nanostructures in bulk and on surfaces. The ability to generate and control entanglement in a system with long-range interaction will be of great importance for future quantum technology. An important step forward to reach this goal is the creation of entangled states for spins of distant magnetic atoms. Herein, the generation of long-distance entanglement between remote spins at large separations in bulk and on surface is studied theoretically, based on a quantum spin Hamiltonian and time-dependent Schrödinger equation for experimentally realized conditions. We demonstrate that long-distance entanglement can be generated between remote spins by using an appropriate quantum spin chain (a quantum mediator), composed by sets of antiferromagnetically coupled spin dimers. Ground state properties and quantum spin dynamics of entangled atoms are studied. We demonstrate that one can increase or suppress entanglement by adding a single spin in the mediator. The obtained result is explained by monogamy property of entanglement distribution inside a quantum spin system. We present a novel approach for non-local sensing of remote magnetic adatoms via spin entanglement.

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“…Such features are vital for the transmission of classical information along well-defined crystal axes. 20 Finally, the formation of mixed crystals utilizing diamagnetic moiety 2 to dilute the spin concentration will make it possible to study temperature-and concentration-dependent anisotropic exchange interactions with electron paramagnetic resonance (EPR) spectroscopy.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Furthermore, the layered tetragonal nature of UCLA-NO not only insulates the nitroxide rotors between the 2D-nets formed by 3 and 4 , but it also allows for the application of transverse magnetic fields along specific crystallographic faces of the MOF. Such features are vital for the transmission of classical information along well-defined crystal axes . Finally, the formation of mixed crystals utilizing diamagnetic moiety 2 to dilute the spin concentration will make it possible to study temperature- and concentration-dependent anisotropic exchange interactions with electron paramagnetic resonance (EPR) spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

2D Arrays of Organic Qubit Candidates Embedded into a Pillared-Paddlewheel Metal–Organic Framework

et al. 2020

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The creation of ordered arrays of qubits that can be interfaced from the macroscopic world is an essential challenge for the development of quantum information science (QIS) currently being explored by chemists and physicists. Recently, porous metal–organic frameworks (MOFs) have arisen as a promising solution to this challenge as they allow for atomic-level spatial control of the molecular subunits that comprise their structures. To date, no organic qubit candidates have been installed in MOFs despite their structural variability and promise for creating systems with adjustable properties. With this in mind, we report the development of a pillared-paddlewheel-type MOF structure that contains 4,7-bis(2-(4-pyridyl)-ethynyl) isoindoline N-oxide and 1,4-bis(2-(4-pyridyl)-ethynyl)-benzene pillars that connect 2D sheets of 9,10-dicarboxytriptycene struts and Zn2(CO2)4 secondary binding units. The design allows for the formation of ordered arrays of reorienting isoindoline nitroxide spin centers with variable concentrations through the use of mixed crystals containing the secondary 1,4-phenylene pillar. While solvent removal causes decomposition of the MOF, magnetometry measurements of the MOF containing only N-oxide pillars demonstrated magnetic interactions with changes in magnetic moment as a function of temperature between 150 and 5 K. Variable-temperature electron paramagnetic resonance (EPR) experiments show that the nitroxides couple to one another at distances as long as 2 nm, but act independently at distances of 10 nm or more. We also use a specially designed resonance microwave cavity to measure the face-dependent EPR spectra of the crystal, demonstrating that it has anisotropic interactions with impingent electromagnetic radiation.

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Extremely long-lived magnetic excitations in supported Fe chains

Cited by 8 publications

References 54 publications

A model for individual quantal nano-skyrmions

A model for individual quantal nano-skyrmions

Engineering of entanglement and spin state transfer via quantum chains of atomic spins at large separations

2D Arrays of Organic Qubit Candidates Embedded into a Pillared-Paddlewheel Metal–Organic Framework

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