Infrared transient absorption and excited-states of excitons and biexcitons confined in CuCl quantum dots

Miyajima, Kensuke; Edamatsu, Keiichi; Itoh, Tadashi

doi:10.1016/j.jlumin.2004.01.078

Cited by 12 publications

(9 citation statements)

References 9 publications

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“…The time-profile has two decay components with the decay times of about 50 ps and 330 ps, respectively. According to the previous reports [5], it is concluded that the fast and slow decay components are attributed to the biexcitons and excitons, respectively. The decay curves are fitted by taking account of the generation and relaxation processes of the biexcitons and excitons under the two-photon resonant excitation of the biexcitons, as shown by dashed and dotted curves.…”

Section: Resultsmentioning

confidence: 79%

“…The transition dynamics and the oscillator strength of Rydberg excited states might be different from that of the electron or hole in the case of strong confinement regime. In addition, we have reported the existence of the excited state of the biexciton, which is composed of Rydberg 1s and 2p excitons, for CuCl QDs [5,6]. Such excited states of the biexciton in the QDs are specific because of the compulsory interaction between the two excitons in confinement system.…”

Section: Introductionmentioning

confidence: 95%

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Transition between rydberg 1s and 2p exciton states of biexcitons in semiconductor quantum dots

Miyajima

Sawada

Ashida

et al. 2007

2007 Quantum Electronics and Laser Science Conference

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Section: Resultsmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 95%

Transition between rydberg 1s and 2p exciton states of biexcitons in semiconductor quantum dots

Miyajima

Sawada

Ashida

et al. 2007

2007 Quantum Electronics and Laser Science Conference

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“…Although the ground state (GS) of an exciton a GQD has been investigated by several authors, studies on the excited states of an exciton in a GQD are few and far between. The excited states of an exciton are important in both infrared spectroscopy and two-photon spectroscopy 46 . Xie 47 has considered the exciton problem in a GQD and has studied the ground and the first excited states by using the matrix diagonalization method.…”

Section: Introductionmentioning

confidence: 99%

Magnetic field effect on the energy levels of an exciton in a GaAs quantum dot: Application for excitonic lasers

Jahan

Boda

Shankar

et al. 2018

Sci Rep

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The problem of an exciton trapped in a Gaussian quantum dot (QD) of GaAs is studied in both two and three dimensions in the presence of an external magnetic field using the Ritz variational method, the 1/N expansion method and the shifted 1/N expansion method. The ground state energy and the binding energy of the exciton are obtained as a function of the quantum dot size, confinement strength and the magnetic field and compared with those available in the literature. While the variational method gives the upper bound to the ground state energy, the 1/N expansion method gives the lower bound. The results obtained from the shifted 1/N expansion method are shown to match very well with those obtained from the exact diagonalization technique. The variation of the exciton size and the oscillator strength of the exciton are also studied as a function of the size of the quantum dot. The excited states of the exciton are computed using the shifted 1/N expansion method and it is suggested that a given number of stable excitonic bound states can be realized in a quantum dot by tuning the quantum dot parameters. This can open up the possibility of having quantum dot lasers using excitonic states.

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“…The Rydberg energy of the exciton in the QD was reported to increase with decreasing the dot size [7,8]. For the biexcitons, an anti-binding state consisting of two 1s excitons [9], and the excited states related to (1s, 2p) states were reported for the CuCl QDs [10].…”

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confidence: 95%

Infrared transient absorption spectra for excited transition of excitons and biexcitons in CuCl

Yoshioka

Miyajima

Ashida

et al. 2008

Phys. Status Solidi (c)

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Infrared transient absorption (IRTA) spectra for excitons and biexcitons in CuCl bulk crystal have been measured by pump‐probe spectroscopy. The IRTA peak energy of the exciton agrees with the transition energy between Rydberg 1s to 2p states reported in one‐ and two‐photon absorption measurement. On the other hand, the IRTA peak energy of the biexcitons locates in energy higher than that of the excitons, which is reasonable by taking hydrogen molecule model into account. In addition, our results support the enhancement of the transition energy between 1s and 2p states in quantum dots compared to the bulk case. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Infrared transient absorption and excited-states of excitons and biexcitons confined in CuCl quantum dots

Cited by 12 publications

References 9 publications

Transition between rydberg 1s and 2p exciton states of biexcitons in semiconductor quantum dots

Transition between rydberg 1s and 2p exciton states of biexcitons in semiconductor quantum dots

Magnetic field effect on the energy levels of an exciton in a GaAs quantum dot: Application for excitonic lasers

Infrared transient absorption spectra for excited transition of excitons and biexcitons in CuCl

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