退相干效应对顺磁和超顺磁粒子隧穿率的影响
Decoherence effects on the tunneling rate of paramagnetic and superparamagnetic particles
摘要：
我们分析了环境对顺磁和超顺磁粒子自旋隧穿过程的影响，得出结论：在这种情况下，非辅助宏观隧穿速率几乎不受影响，但其他更有效的（声子介导的）过程改变了粒子的磁化状态。我们得出结论，对于顺磁性和超顺磁性粒子，退相干时间尺度非常短（~ 10^（-8..- 16）seg），表明相干隧穿应当被强烈抑制以有利于非相干隧穿，即，较高能级的粒子数随衰变而增加。
英文摘要：
We analyze the effects of the environment on the spin tunneling process of paramagnetic and superparamagnetic particles and conclude that the non assisted macroscopic tunneling rate is hardly affected in such case, but other more effective (phonon mediated) processes change the magnetization state of the particle. We conclude that for both, paramagnetic and superparamagnetic particles, the decoherence time scale is extremely short (~ 10^(-8..-16)seg), indicating thar coherent tunneling should be strongly suppressed in favor of incoherent tunneling, i.e., the population of higher levels with subsequent decay.
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