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Attractive Coulomb interaction of two-dimensional Rydberg excitons

机译：二维里德堡激子的库仑相互作用

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摘要

We analyze theoretically the Coulomb scattering processes of highly excited excitons in the direct-band-gap semiconductor quantum wells. We find that contrary to the interaction of ground-state excitons, the electron and hole exchange interaction between excited excitons has an attractive character both for s- and p-type two-dimensional (2D) excitons. Moreover, we show that similar to the three-dimensional highly excited excitons, the direct interaction of 2D Rydberg excitons exhibits van der Waals-type long-range interaction. The results predict the linear growth of the absolute value of exchange interaction strength with an exciton principal quantum number and point the way towards enhancement of optical nonlinearitv in 2D excitonic systems.
机译：我们从理论上分析了直接带隙半导体量子阱中高激发态激子的库仑散射过程。我们发现，与基态激子的相互作用相反，受激激子之间的电子和空穴交换相互作用对于s型和p型二维（2D）激子都具有吸引人的特性。此外，我们表明，类似于三维高激发态激子，二维Rydberg激子的直接相互作用表现出范德华型远程相互作用。结果预测了交换相互作用强度的绝对值与激子主量子数的线性增长，并为增强二维激子系统中的光学非线性指明了道路。

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  • 来源
    《Physical review》 |2016年第24期|245302.1-245302.9|共9页
  • 作者

    V. Shahnazaryan; I. A. Shelykh; O. Kyriienko;

  • 作者单位

    Science Institute, University of Iceland, Dunhagi-3, IS-107 Reykjavik, Iceland,Institute of Mathematics and High Technologies, Russian-Armenian (Slavonic) University, Hovsep Emin 123, 0051 Yerevan, Armenia,Department of Photonics and Optical Information, ITMO University, St. Petersburg 197101, Russia;

    Science Institute, University of Iceland, Dunhagi-3, IS-107 Reykjavik, Iceland,Department of Photonics and Optical Information, ITMO University, St. Petersburg 197101, Russia,Division of Physics and Applied Physics, Nanyang Technological University, 637371 Singapore;

    The Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, DK-2100 Copenhagen, Denmark;

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