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Anisotropic exciton Stark shift in hemispherical quantum dots |
| Shu-Dong Wu(吴曙东)† |
| College of Physics Science and Technology, Yangzhou University, Yangzhou 225002, China |
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Abstract The exciton Stark shift and polarization in hemispherical quantum dots (HQDs) each as a function of strength and orientation of applied electric field are theoretically investigated by an exact diagonalization method. A highly anisotropic Stark redshift of exciton energy is found. As the electric field is rotated from Voigt to Faraday geometry, the redshift of exciton energy monotonically decreases. This is because the asymmetric geometric shape of the hemispherical quantum dot restrains the displacement of the wave function to the higher orbital state in response to electric field along Faraday geometry. A redshift of hole energy is found all the time while a transition of electron energy from this redshift to a blueshift is found as the field is rotated from Voigt to Faraday geometry. Taking advantage of the diminishing of Stark effect along Faraday geometry, the hemispherical shapes can be used to improve significantly the radiative recombination efficiency of the polar optoelectronic devices if the strong internal polarized electric field is along Faraday geometry.
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Received: 07 November 2020
Revised: 11 December 2020
Accepted manuscript online: 17 December 2020
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PACS:
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32.60.+i
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(Zeeman and Stark effects)
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71.35.-y
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(Excitons and related phenomena)
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73.21.La
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(Quantum dots)
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94.20.Ss
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(Electric fields; current system)
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Corresponding Authors:
Shu-Dong Wu
E-mail: sdwu@yzu.edu.cn
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Cite this article:
Shu-Dong Wu(吴曙东) Anisotropic exciton Stark shift in hemispherical quantum dots 2021 Chin. Phys. B 30 053201
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