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Spin electric effects in molecular antiferromagnets

机译：分子反铁磁体中的自旋电效应

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摘要

Molecular nanomagnets show clear signatures of coherent behavior and have a wide variety of effective low-energy spin Hamiltonians suitable for encoding qubits and implementing spin-based quantum information processing. At the nanoscale, the preferred mechanism for the control of a quantum systems is the application of electric fields, which are strong, can be locally applied, and rapidly switched. In this work, we provide the theoretical tools for identifying molecular nanomagnets suitable for electric control. By group-theoretical symmetry analysis we find that the spin-electric coupling in triangular molecules is governed by the modification of the exchange interaction and is possible even in the absence of spin-orbit coupling. In pentagonal molecules the spin-electric coupling can exist only in the presence of spin-orbit interaction. This kind of coupling is allowed for both 5=1/2 and s=3/2 spins at the magnetic centers. Within the Hubbard model, we find a relation between the spin-electric coupling and the properties of the chemical bonds in a molecule, suggesting that the best candidates for strong spin-electric coupling are molecules with nearly degenerate bond orbitals. We also investigate the possible experimental signatures of spin-electric coupling in nuclear magnetic resonance and electron spin resonance spectroscopy, as well as in the thermodynamic measurements of magnetization, electric polarization, and specific heat of the molecules.
机译：分子纳米磁铁显示出清晰的相干行为特征，并具有多种有效的低能量自旋哈密顿量，适用于编码量子位和实现基于自旋的量子信息处理。在纳米级，控制量子系统的首选机制是施加电场，该电场应很强，可以局部施加并快速切换。在这项工作中，我们提供了识别适用于电控制的分子纳米磁铁的理论工具。通过基团理论对称性分析，我们发现三角形分子中的自旋电耦合受交换相互作用的调控，即使在没有自旋轨道耦合的情况下也是可能的。在五边形分子中，自旋-电耦合仅在存在自旋-轨道相互作用时才能存在。对于磁中心处的5 = 1/2和s = 3/2自旋，都允许进行这种耦合。在Hubbard模型中，我们发现了自旋电耦合与分子中化学键的性质之间的关系，这表明强自旋电耦合的最佳候选者是具有几乎简并的键轨道的分子。我们还研究了核磁共振和电子自旋共振光谱以及分子的磁化，电极化和比热的热力学测量中自旋-电耦合的可能实验特征。

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  • 来源
    《Physical review》 |2010年第4期|P.045429.1-045429.29|共29页
  • 作者

    Mircea Trif; Filippo Troiani; Dimitrije Stepanenko; Daniel Loss;

  • 作者单位

    Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland;

    CNR-INFM National Research Center S3, Istituto Nanoscienze-CNR, via G. Campi 213/A, 41100 Modena, Italy;

    Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland;

    Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    molecular magnets; quantum computation;

    机译：分子磁体;量子计算;

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