Zhang Tianhao, Kuznetsova Irina, Meier Torsten, Li Xiaoqin, Mirin Richard P, Thomas Peter, Cundiff Steven T
JILA, University of Colorado and National Institute of Standards and Technology, Boulder, CO 80309-0440, USA.
Proc Natl Acad Sci U S A. 2007 Sep 4;104(36):14227-32. doi: 10.1073/pnas.0701273104. Epub 2007 Jul 13.
Optical 2D Fourier transform spectroscopy (2DFTS) provides insight into the many-body interactions in direct gap semiconductors by separating the contributions to the coherent nonlinear optical response. We demonstrate these features of optical 2DFTS by studying the heavy-hole and light-hole excitonic resonances in a gallium arsenide quantum well at low temperature. Varying the polarization of the incident beams exploits selection rules to achieve further separation. Calculations using a full many-body theory agree well with experimental results and unambiguously demonstrate the dominance of many-body physics.
光学二维傅里叶变换光谱（2DFTS）通过分离对相干非线性光学响应的贡献，深入了解直接带隙半导体中的多体相互作用。我们通过研究低温下砷化镓量子阱中的重空穴和轻空穴激子共振，展示了光学2DFTS的这些特性。改变入射光束的偏振利用选择定则实现进一步分离。使用完整多体理论的计算结果与实验结果吻合良好，明确证明了多体物理的主导地位。
