Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Physics Letters A

Secondary peak in the optical absorption spectra: A possible criterion for Bose condensation of excitons

Zlatko G. Koinov

Published Jun 20, 2007• 1 citation
Publisher
DOI
10.1016/j.physleta.2007.06.029

Related papers

Bose-Einstein Condensation of Excitons

Claude Benoit à la Guillaume, Erio Tosatti

Europhysics news•Jan 1, 1974•0 citations

Excitonic effects in Cu₂2O : scattered light, resonant absorption and Bose-Einstein condensate amplification.

André Merizzi

Experimental results are presented on excitonic effects related to the Bose-Einstein condensation (BEC) of excitons in Cu2O. Such effects include resonant light polarization dependent absorption, exciton creation and diffusion by absorption of scattered light, and resonant high density exciton packet induced absorption. These results are then utilized, in conjunction with similar results on excitonic BEC, to develop a plausible model for condensate amplification. Condensates are initially created at T = 1.8K with high intensity ND:YAG pulses (lambda = 532 nm) and then stimulated by a secondary source tuned around the 1S orthoexciton resonance (lambda = 609.51 nm); the latter induces the observed condensate amplification. By careful analysis of the various interactions between the secondary light source, the crystal, and the condensate itself, an improved understanding of how the secondary pulse excitations interact with the passage of a high density exciton packet is obtained.

•Jan 1, 2001•0 citations

Bose-einstein Condensation Of Excitons

A. Mysyrowicz

Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)•Aug 24, 2005•1 citation

Interband optical-absorption spectra of a finite quantum dot superlattice in a cylindrical nanowire

T. Y. Zhang, Wei Zhao, Junjie Cao +1 more

Theoretical calculations of the interband optical-absorption spectra of a finite quantum dot superlattice in a wire (QDSLW) in the presence of a homogeneous dc or terahertz field are presented. The QDSLW has miniband structures of the electron states as general quantum well superlattices do and shows the two features common to one-dimensional structures, viz., strong excitonic absorption below and weak absorption above the band edge. The applied dc field causes a redshift of the location and a decrease in height of the main excitonic peak and leads to an increase in height of the minor peak next to the main peak. In the presence of a terahertz field, the Autler-Townes splitting of the main excitonic peak and the emergence of one-photon and two-photon gain peaks on the spectra are demonstrated.

Journal of Applied Physics•Nov 1, 2005•11 citations

Bose-Einstein condensation of excitons

Paul H. M. van Loosdrecht, D. van der Marel, K. Karpińska

•Jan 1, 2003•0 citations

Dynamical Processes of High Density Single Excitons and Excitonic Molecules in CdSe

Hiroto Kuroda, Shigeo Shionoya

To study the dynamical processes of high density single excitons and excitonic molecules in CdSe, the time dependences of M, P M and P luminescence lines and the time-resolved absorption spectra of A excitons are measured in the pico-second region at 4.2 K. The exciton absorption peak shifts to the high energy side due to the high density effect, the shift reaching the maximum at 20 ps after the pulse excitation. M line reaches the maximum at 100 ps, P M line at 200 ps and P line at 300∼350 ps. The decay constants are 100, 100 and 350 ps, respectively. The dynamical aspects of the formation of A excitons, the formation of excitonic molecules and the inelastic collisions of single excitons and excitonic molecules are discussed. It is interpreted why the use of the pico-second pulse excitation is essentially important for the realization of the Bose condensation of excitonic molecules.

Journal of the Physical Society of Japan•Feb 1, 1974•32 citations
Experimental results are presented on excitonic effects related to the Bose-Einstein condensation (BEC) of excitons in Cu2O. Such effects include resonant light polarization dependent absorption, exciton creation and diffusion by absorption of scattered light, and resonant high density exciton packet induced absorption. These results are then utilized, in conjunction with similar results on excitonic BEC, to develop a plausible model for condensate amplification. Condensates are initially created at T = 1.8K with high intensity ND:YAG pulses (lambda = 532 nm) and then stimulated by a secondary source tuned around the 1S orthoexciton resonance (lambda = 609.51 nm); the latter induces the observed condensate amplification. By careful analysis of the various interactions between the secondary light source, the crystal, and the condensate itself, an improved understanding of how the secondary pulse excitations interact with the passage of a high density exciton packet is obtained.
Theoretical calculations of the interband optical-absorption spectra of a finite quantum dot superlattice in a wire (QDSLW) in the presence of a homogeneous dc or terahertz field are presented. The QDSLW has miniband structures of the electron states as general quantum well superlattices do and shows the two features common to one-dimensional structures, viz., strong excitonic absorption below and weak absorption above the band edge. The applied dc field causes a redshift of the location and a decrease in height of the main excitonic peak and leads to an increase in height of the minor peak next to the main peak. In the presence of a terahertz field, the Autler-Townes splitting of the main excitonic peak and the emergence of one-photon and two-photon gain peaks on the spectra are demonstrated.
To study the dynamical processes of high density single excitons and excitonic molecules in CdSe, the time dependences of M, P M and P luminescence lines and the time-resolved absorption spectra of A excitons are measured in the pico-second region at 4.2 K. The exciton absorption peak shifts to the high energy side due to the high density effect, the shift reaching the maximum at 20 ps after the pulse excitation. M line reaches the maximum at 100 ps, P M line at 200 ps and P line at 300∼350 ps. The decay constants are 100, 100 and 350 ps, respectively. The dynamical aspects of the formation of A excitons, the formation of excitonic molecules and the inelastic collisions of single excitons and excitonic molecules are discussed. It is interpreted why the use of the pico-second pulse excitation is essentially important for the realization of the Bose condensation of excitonic molecules.