Quantum tunneling of the magnetization is a phenomenon that impedes the use of small anisotropic spin systems for storage purposes even at the lowest temperatures. Phonons, usually considered for temperature dependent relaxation of magnetization over the anisotropy barrier, also contribute to magnetization tunneling for integer spin quantum numbers. Here we demonstrate that certain spin–phonon Hamiltonians are unexpectedly robust against the opening of a tunneling gap, even for strong spin–phonon coupling. The key to understanding this phenomenon is provided by an underlying supersymmetry that involves both spin and phonon degrees of freedom.

中文翻译：

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超对称自旋声子耦合可防止量子隧穿产生奇数自旋

磁化的量子隧穿是一种现象，即使在最低温度下，也阻碍了将小型各向异性自旋系统用于存储目的。通常考虑在各向异性势垒上依赖于温度的磁化弛豫的声子，也有助于整数自旋量子数的磁化隧穿。在这里，我们证明了某些自旋声子哈密顿量出乎意料地抵抗了隧穿缝隙的打开，即使对于强自旋声子耦合也是如此。理解这种现象的关键是通过一个潜在的超对称性提供的，该对称性涉及自旋和声子自由度。