Adiabatic Control of the Phase Memory Relaxation in the Anticrossing Region

IF 1.1 4区 物理与天体物理 Q4 PHYSICS, ATOMIC, MOLECULAR & CHEMICAL Applied Magnetic Resonance Pub Date : 2024-09-06 DOI:10.1007/s00723-024-01714-3
Yuri E. Kandrashkin
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Abstract

In the vicinity of the anticrossing region of the spin sublevels, the effective magnetic moment of the electron spin is reduced, resulting in an increase in the lifetime of the spin coherence. Based on this phenomenon, the modified electron spin echo protocol is proposed to extend the coherence relaxation time. It includes the Hahn echo sequence with the additional detuning of the magnetic field applied during the intervals between two pulses and between the refocusing pulse and the echo. The simplest system with anticrossing sublevels is an ion whose electron spin is strongly coupled to its own nucleus. To realize the proposed protocol, a narrow anticrossing region is required. The promising candidate to realize the proposed protocol is the crystal [Ho(W5O18)2]9−, whose spin transitions have been studied in the recent paper (Kundu et al. Commun Phys 6:38 (2023)). Near the clock transition, the spin evolution of the electron–nuclear spin system is described by a fictitious spin 1/2, but with the magnetic properties dictated by the properties of the ion. The numerical study shows that the spin coherence is not destroyed by the magnetic field detuning, but it reduces the phase relaxation. In addition, the use of the unequal detuning pulses results in a phase shift of the spin echo, which can be used to discriminate between the target signal and the unwanted echo contributions.

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反交叉区域相忆松弛的绝热控制
在自旋子水平的反交叉区域附近,电子自旋的有效磁矩减小,导致自旋相干寿命延长。基于这一现象,我们提出了改进的电子自旋回波方案,以延长相干弛豫时间。它包括哈恩回波序列,并在两个脉冲之间以及再聚焦脉冲和回波之间施加额外的失谐磁场。具有反交叉子水平的最简单系统是电子自旋与自身原子核强耦合的离子。要实现提议的协议,需要一个狭窄的反交叉区域。最近的一篇论文(Kundu et al. Commun Phys 6:38 (2023))研究了晶体 [Ho(W5O18)2]9-的自旋跃迁。在时钟跃迁附近,电子-核自旋系统的自旋演化由一个虚构的自旋 1/2 描述,但其磁性由离子的特性决定。数值研究表明,磁场失谐不会破坏自旋相干性,但会降低相位弛豫。此外,不等解谐脉冲的使用会导致自旋回波的相移,这可用于区分目标信号和不需要的回波信号。
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来源期刊
Applied Magnetic Resonance
Applied Magnetic Resonance 物理-光谱学
CiteScore
1.90
自引率
10.00%
发文量
59
审稿时长
2.3 months
期刊介绍: Applied Magnetic Resonance provides an international forum for the application of magnetic resonance in physics, chemistry, biology, medicine, geochemistry, ecology, engineering, and related fields. The contents include articles with a strong emphasis on new applications, and on new experimental methods. Additional features include book reviews and Letters to the Editor.
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