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Magnetization induced skyrmion dynamics of a spin-orbit-coupled spinor condensate under sinusoidally varying magnetic field
Quantum Gases · Submitted 11 Nov 2024
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We confirm the presence of scissor mode excitations in the spin texture due to the angular skyrmion oscillations.
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The abstract, sentence by sentence
We theoretically explore the spin texture dynamics of a harmonically trapped spin-1 Bose-Einstein condensate with Rashba spin-orbit coupling and ferromagnetic spin-exchange interactions under a sinusoidally varying magnetic field along the $x$-direction. This interplay yields an intrinsic spin texture in the ground state, forming a linear chain of alternating skyrmions at the saddle points. Our study analyzes the spin-mixing dynamics for both a freely evolving and a controlled longitudinal magnetization. The spin-1 system exhibits the Einstein-de Hass effect for the first case, for which an exchange between the total orbital angular momentum and the spin angular momentum is observed, resulting in minimal oscillations about the initial position of the skyrmion chain. However, for the fixed magnetization dynamics, the skyrmion chain exhibits ample angular oscillations about the equilibrium position, with the temporary formation of new skyrmions and anti-skyrmions to facilitate the oscillatory motion. Keeping the magnetization constant, this contrast now stems from the exchange between the canonical and spin-dependent contribution to the orbital angular momentum. The variation in canonical angular momentum is linked to the angular oscillations, while the spin-dependent angular momentum accounts for the creation or annihilation of skyrmions. We confirm the presence of scissor mode excitations in the spin texture due to the angular skyrmion oscillations.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We theoretically explore the spin texture dynamics of a harmonically trapped spin-1 Bose-Einstein condensate with Rashba spin-orbit coupling and ferromagnetic spin-exchange interactions under a sinusoidally varying magnetic field along the $x$-direction. | contribution 0.93 | 0.91 | 0.05 | asserted 0.88 |
| s1 | This interplay yields an intrinsic spin texture in the ground state, forming a linear chain of alternating skyrmions at the saddle points. | result 1.00 | 0.78 | 0.14 | asserted 1.00 |
| s2 | Our study analyzes the spin-mixing dynamics for both a freely evolving and a controlled longitudinal magnetization. | contribution 0.94 | 0.88 | 0.06 | asserted 0.96 |
| s3 | The spin-1 system exhibits the Einstein-de Hass effect for the first case, for which an exchange between the total orbital angular momentum and the spin angular momentum is observed, resulting in minimal oscillations about the initial position of the skyrmion chain. | result 0.97 | 0.86 | 0.13 | asserted 1.00 |
| s4 | However, for the fixed magnetization dynamics, the skyrmion chain exhibits ample angular oscillations about the equilibrium position, with the temporary formation of new skyrmions and anti-skyrmions to facilitate the oscillatory motion. | result 1.00 | 0.90 | 0.24 | asserted 1.00 |
| s5 | Keeping the magnetization constant, this contrast now stems from the exchange between the canonical and spin-dependent contribution to the orbital angular momentum. | interpretation 0.99 | 0.81 | 0.14 | asserted 1.00 |
| s6 | The variation in canonical angular momentum is linked to the angular oscillations, while the spin-dependent angular momentum accounts for the creation or annihilation of skyrmions. | interpretation 0.98 | 0.85 | 0.18 | asserted 1.00 |
| s7 | We confirm the presence of scissor mode excitations in the spin texture due to the angular skyrmion oscillations. | result 0.99 | 0.92 | 0.18 | asserted 1.00 |
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Original abstract
We theoretically explore the spin texture dynamics of a harmonically trapped spin-1 Bose-Einstein condensate with Rashba spin-orbit coupling and ferromagnetic spin-exchange interactions under a sinusoidally varying magnetic field along the $x$-direction. This interplay yields an intrinsic spin texture in the ground state, forming a linear chain of alternating skyrmions at the saddle points. Our study analyzes the spin-mixing dynamics for both a freely evolving and a controlled longitudinal magnetization. The spin-1 system exhibits the Einstein-de Hass effect for the first case, for which an exchange between the total orbital angular momentum and the spin angular momentum is observed, resulting in minimal oscillations about the initial position of the skyrmion chain. However, for the fixed magnetization dynamics, the skyrmion chain exhibits ample angular oscillations about the equilibrium position, with the temporary formation of new skyrmions and anti-skyrmions to facilitate the oscillatory motion. Keeping the magnetization constant, this contrast now stems from the exchange between the canonical and spin-dependent contribution to the orbital angular momentum. The variation in canonical angular momentum is linked to the angular oscillations, while the spin-dependent angular momentum accounts for the creation or annihilation of skyrmions. We confirm the presence of scissor mode excitations in the spin texture due to the angular skyrmion oscillations.
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Cites as background 1 paper
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These degenerate fluids are interesting in their own right as they could be investigated for the system properties and the interaction between atomic states, shedding light on a range of topics such as quantum phase transitions [ref] , non-equilibrium quantum dynamics [ref] and instabilities [ref] , the role of symmetry and topology in quantum-ordered materials [ref] , topological defects [ref] , spin dynamics [ref] , etc.
Stable singular fractional skyrmion spin texture from the quantum Kelvin-Helmholtz instability · Introduction · 0.96
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