论文标题
自旋 - 音波相互作用诱导单分子磁铁中的隧道裂开
Spin-phonon interaction induces tunnel splitting in single-molecule magnets
论文作者
论文摘要
磁化强度的量子隧穿是使用单分子磁铁（SMM）作为下一代存储设备的基本成分的主要障碍。在这种情况下，通常仅将声子视为促进旋转系统以遍历各向异性屏障的干扰。在这里，我们证明了声子诱导地面双线隧道拆分的能力，然后由于磁化强度的Landau-Zener隧道而降低了所需的双重性。有害的是那些修改旋转汉密尔顿的声子，以使其围绕场轴的旋转对称性被破坏。在我们的计算中，我们通过对哈密顿量的量子计算来处理同一基础上的旋转和声子，其中单相关张量与谐波振荡器耦合。
Quantum tunneling of the magnetization is a major obstacle to the use of single-molecule magnets (SMMs) as basic constituents of next-generation storage devices. In this context, phonons are often only considered (perturbatively) as disturbances that promote the spin system to traverse the anisotropy barrier. Here, we demonstrate the ability of phonons to induce a tunnel splitting of the ground doublet which then reduces the required bistability due to Landau-Zener tunneling of the magnetization. Harmful are those phonons that modify the spin Hamiltonian so that its rotational symmetry about the field axis is destroyed. In our calculations we treat spins and phonons on the same footing by performing quantum calculations of a Hamiltonian where the single-anisotropy tensors are coupled to harmonic oscillators.
