Controlled Creation of Quantum Skyrmions

Siegl, Pia; Vedmedenko, Elena Y.; Stier, Martin; Thorwart, Michael; Posske, Thore

doi:10.48550/arxiv.2110.00348

Cited by 2 publications

(3 citation statements)

References 33 publications

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“…Furthermore, we argue that the polarization gives access to the zero temperature phase diagram of the model under investigation. Contrary to similar quasiparticles found in frustrated lattices [18] or quantum skyrmions embedded in a classical magnet [20], we show that the skyrmion lattice phase reported in this letter emerges from entangled spin-1/2 pairs, which bear witness to a genuine quantum mechanical origin without classical analog.…”

Section: Introductioncontrasting

confidence: 80%

“…[16] used a multiscale approach to demonstrate that mesoscopic magnetization vortices are stabilized by quantum fluctuations [17], which suggests the possibility of inherently quantum-mechanical counterparts of these states at zero temperature. So far, attempts to classify skyrmion excitations with sizes comparable to the interatomic spacing have been made in frustrated quantum lattice systems [18] and ferromagnetic lattices with DMI [19,20]. Several geometries have been studied to understand the quantum analogs of classical skyrmions, and quantitative results have been obtained by numerical diagonalization of the Hamiltonian.…”

Section: Introductionmentioning

confidence: 99%

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Quantum Skyrmion Lattices in Heisenberg Ferromagnets

Haller¹,

Groenendijk²,

Habibi³

et al. 2021

Preprint

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Skyrmions are topological magnetic textures which can arise in non-centrosymmetric ferromagnetic materials. In most systems experimentally investigated to date, skyrmions emerge as classical objects. However, the discovery of skyrmions with nanometer length scales has sparked interest in their quantum properties. Quantum corrections to the classical magnetic textures have already been considered in the semiclassical regime. Here, we go beyond this limit by investigating quantum skyrmions in the deep quantum regime. We use density matrix renormalization group techniques to study two-dimensional spin-1/2 Heisenberg ferromagnets with Dzyaloshinskii-Moriya interactions and discover a broad region in the zero temperature phase diagram which hosts quantum skyrmion lattice ground states. We argue that this novel quantum skyrmion phase can be detected experimentally in the magnetization profile via local magnetic polarization measurements as well as in the spin structure factor measurable via neutron scattering experiments. Finally, we explore the resulting quantum skyrmion state, analyze its real space polarization profile and show that it is a non-classical state featuring entanglement between quasiparticle and environment mainly localized near the boundary spins of the skyrmion.

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Section: Introductioncontrasting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Quantum Skyrmion Lattices in Heisenberg Ferromagnets

Haller¹,

Groenendijk²,

Habibi³

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Recently, it has been proposed that topologically protected nanoscale magnetization textures, so-called skyrmions could act as potential building blocks for realizing quantum logic elements [13]. Their formation and dynamics are understood sufficiently well in spintronics [14,15] propelling the interest beyond non-interventional creation or observation studies and extend their suitability for information handling from the classical to the quantum regime [16][17][18][19][20]. Magnetic skyrmions of a few lattice sites in frustrated magnets can exhibit quantized excitations, while maintaining the same topological charge.…”

Section: Introductionmentioning

confidence: 99%

Skyrmion Helicity: Quantization and Quantum Tunneling Effects

Psaroudaki,

Panagopoulos

2022

Preprint

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We derive the quantization of magnetic helicity in the solid state and demonstrate tunable macroscopic quantum tunneling, coherence, and oscillation for a skyrmion spin texture stabilized in frustrated magnets. We also discuss the parameter space for the experimental realization of quantum effects. Typically, for a skyrmion of 5 nm radius, quantum tunneling between two macroscopic states with distinct helicities occurs with an inverse escape rate within seconds below 100 mK, and an energy splitting in the MHz regime. Feasibility of quantum tunneling of an ensemble of magnetic spins inspires new platforms for quantum operations utilizing topologically protected chiral spin configurations.

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Controlled Creation of Quantum Skyrmions

Cited by 2 publications

References 33 publications

Quantum Skyrmion Lattices in Heisenberg Ferromagnets

Quantum Skyrmion Lattices in Heisenberg Ferromagnets

Skyrmion Helicity: Quantization and Quantum Tunneling Effects

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