Coherent coupling of individual quantum dots measured with phase-referenced two-dimensional spectroscopy: Photon echo versus double quantum coherence
Coherent coupling of individual quantum dots measured with phase-referenced two-dimensional spectroscopy: Photon echo versus double quantum coherence
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DOI：
10.1103/physrevb.96.041124
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发表时间：
2017-07-26
影响因子：
3.7
通讯作者：
Kasprzak, Jacek
中科院分区：
文献类型：
--
作者：
Delmonte, Valentin;Specht, Judith F.;Kasprzak, Jacek
我们采用二维（2D）相干非线性光谱来研究单个InAs量子点（QDs）和QD分子之间的耦合。在两束序列中交换脉冲顺序允许人们区分重相和非重相四波混频（FWM）配置。我们强调非重相情况下，允许一个监测双光子相干动力学。各自的傅里叶变换产生双量子二维FWM图，该图与源自重相序列的单量子对应物相证实。我们引入了与驱动脉冲携带的相位相参照，克服了二维光谱学中需要的主动稳定的必要性。结合单量子和双量子二维FWM为检测和确定单个量子系统之间的相干耦合机制提供了相关的工具，如实验所示。
We employ two-dimensional (2D) coherent, nonlinear spectroscopy to investigate couplings within individual InAs quantum dots (QDs) and QD molecules. Swapping pulse ordering in a two-beam sequence permits one to distinguish between rephasing and nonrephasing four-wave mixing (FWM) configurations. We emphasize the nonrephasing case, allowing one to monitor two-photon coherence dynamics. Respective Fourier transform yields a double quantum 2D FWM map, which is corroborated with its single quantum counterpart, originating from the rephasing sequence. We introduce referencing of the FWM phase with the one carried by the driving pulses, overcoming the necessity of its active stabilization, as required in 2D spectroscopy. Combining single and double quantum 2D FWM provides a pertinent tool in detecting and ascertaining coherent coupling mechanisms between individual quantum systems, as exemplified experimentally.