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Electrical generation of spontaneous optical emission in electrically modulated two-dimensional electron gases at low-temperatures

Journal Article


Abstract


  • A detailed theoretical study is presented for spontaneous optical emission from a two-dimensional electron gas (2DEG) in the presence of a unidirectional spatially periodic modulation at low temperatures. The momentum- and energy-balance equations for electron-photon interactions in the device system are solved self-consistently using the Boltzmann equation, from which we can obtain the frequency and the intensity of the electromagnetic radiation generated. The results obtained indicate that: (1) in an electrically modulated 2DEG at low temperatures, a strong electromagnetic radiation emission up to W/cm2 can be generated by applying a small d.c. electric field: (2) the radiation emission is generated indirectly in the occupied subbands through electronic transitions around the Fermi level; (3) the frequency of the radiation generated is at about 0.1 THz; (4) in the low frequency regime, spontaneous multiphoton emissions can be observed; and (5) this type of optical emission depends strongly on the sample parameters such as the electron density of the 2DEG and the modulation length.

Publication Date


  • 1998

Citation


  • Xu, W., & Zhang, C. (1998). Electrical generation of spontaneous optical emission in electrically modulated two-dimensional electron gases at low-temperatures. International Journal of Modern Physics B, 12(5), 579-590. doi:10.1142/S021797929800034X

Scopus Eid


  • 2-s2.0-2542523153

Start Page


  • 579

End Page


  • 590

Volume


  • 12

Issue


  • 5

Abstract


  • A detailed theoretical study is presented for spontaneous optical emission from a two-dimensional electron gas (2DEG) in the presence of a unidirectional spatially periodic modulation at low temperatures. The momentum- and energy-balance equations for electron-photon interactions in the device system are solved self-consistently using the Boltzmann equation, from which we can obtain the frequency and the intensity of the electromagnetic radiation generated. The results obtained indicate that: (1) in an electrically modulated 2DEG at low temperatures, a strong electromagnetic radiation emission up to W/cm2 can be generated by applying a small d.c. electric field: (2) the radiation emission is generated indirectly in the occupied subbands through electronic transitions around the Fermi level; (3) the frequency of the radiation generated is at about 0.1 THz; (4) in the low frequency regime, spontaneous multiphoton emissions can be observed; and (5) this type of optical emission depends strongly on the sample parameters such as the electron density of the 2DEG and the modulation length.

Publication Date


  • 1998

Citation


  • Xu, W., & Zhang, C. (1998). Electrical generation of spontaneous optical emission in electrically modulated two-dimensional electron gases at low-temperatures. International Journal of Modern Physics B, 12(5), 579-590. doi:10.1142/S021797929800034X

Scopus Eid


  • 2-s2.0-2542523153

Start Page


  • 579

End Page


  • 590

Volume


  • 12

Issue


  • 5