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arXiv 0802.2046cond-mat.mes-hall
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声学声子对局域纳米管激子的非马尔可夫消相干

Non-Markovian decoherence of localized nanotube excitons by acoustic phonons

Christophe Galland, Alexander Högele, Hakan E. Türeci, Ataç Imamoğlu

摘要:

我们证明了嵌入在一维系统中的量子点中的电子-声子相互作用导致了光学跃迁的显著的非马尔可夫退相干。我们提出的实验重点关注低温轴向局域碳纳米管激子的光致发光线形。我们用来模拟声子相互作用的独立玻色子模型以非常高的精度再现了实验中观察到的宽的和不对称的发射线和弱的红失谐径向呼吸模式副本。零声子线的内禀声子诱导的纯退相比寿命展宽大两个数量级,并且是声子浴降维的标志。这种退相干机制的非马尔可夫性质可能会对一维系统在量子信息处理中的应用产生不利影响。

英文摘要:

We demonstrate that electron-phonon interaction in quantum dots embedded in one-dimensional systems leads to pronounced, non-Markovian decoherence of optical transitions. The experiments we present focus on the lineshape of photoluminescence from low-temperature axially localized carbon nanotube excitons. The independent boson model that we use to model the phonon interactions reproduces with very high accuracy the broad and asymmetric emission lines and the weak red-detuned radial breathing mode replicas observed in the experiments. The intrinsic phonon-induced pure-dephasing of the zero-phonon line is two orders of magnitude larger than the lifetime broadening and is a hallmark of the reduced dimensionality of the phonon bath. The non-Markovian nature of this decoherence mechanism may have adverse consequences for applications of one-dimensional systems in quantum information processing.

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