人工单分子磁体的散粒噪声谱:利用Dicke效应测量自旋弛豫时间
Shot noise spectrum of artificial Single Molecule Magnets: measuring spin-relaxation times via the Dicke effect
摘要:
本文从理论上研究了基于CdTe量子点的人工单分子磁体中的散粒噪声散粒噪声。锰孔交换各向异性的噪音,如超泊松行为,导致深刻的后果。我们报告了一种新的效果,类似于量子光学中的迪克效应,它允许使用频率分辨的散粒噪声测量分别提取空穴和Mn自旋弛豫时间。我们希望我们的发现可能与其他S> 12系统中的实验有进一步的相关性,包括通过Mn(12)分子的输运和磁性原子的STM光谱。
英文摘要:
We investigate theoretically shot noise in an artificial Single Molecule Magnet based upon a CdTe quantum dot doped with a single S=5/2 Mn spin and gated in the hole sector. Mn-hole exchange anisotropy is shown to lead to profound consequences on noise, like super-Poissonian behaviour. We report on a novel effect, similar to the Dicke effect in Quantum Optics, that allows to separately extract the hole and Mn spin relaxation times using frequency-resolved shot noise measurements. We expect that our findings may have further relevance to experiments in other S>1/2 systems including transport through Mn(12) molecules and STM spectroscopy of magnetic atoms.
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