Crossed excitons in a semiconductor nanostructure of mixed dimensionality

Semiconductor systems of reduced dimensionality, e.g., quantum dots or quantum wells, display a characteristic spectrum of confined excitons. Combining several of these systems may lead to the formation of “crossed” excitons, and thus new equilibrium states and scattering channels. We derive gain excitation spectra from two-color pump-probe experiments on an In(Ga)As based quantum dot semiconductor optical amplifier by analyzing the amplitudes of the traces. This grants access to the quantum dot response, even in the presence of strong absorption by the surroundings at the excitation energy. The gain excitation spectra yield evidence of crossed quantum dot-bulk states.

[1]  Elias Goldmann,et al.  Excitonic fine-structure splitting in telecom-wavelength InAs/GaAs quantum dots: Statistical distribution and height-dependence , 2013 .

[2]  Gerhard Klimeck,et al.  The polarization response in InAs quantum dots: theoretical correlation between composition and electronic properties , 2012, Nanotechnology.

[3]  A. Zunger,et al.  Localized interface states in coherent isovalent semiconductor heterojunctions , 2011 .

[4]  A. Knorr,et al.  Analytical description of gain depletion and recovery in quantum dot optical amplifiers , 2010 .

[5]  A. Zunger,et al.  Coexistence and coupling of zero-dimensional, two-dimensional, and continuum resonances in nanostructures , 2009 .

[6]  A. Zunger,et al.  Strain-Induced Localized States Within the Matrix Continuum of Self-Assembled Quantum Dots , 2009 .

[7]  D. Bimberg,et al.  Theoretical and Experimental Study of High-Speed Small-Signal Cross-Gain Modulation of Quantum-Dot Semiconductor Optical Amplifiers , 2009, IEEE Journal of Quantum Electronics.

[8]  E. Schöll,et al.  Impact of Coulomb scattering on the ultrafast gain recovery in InGaAs quantum dots. , 2008, Physical review letters.

[9]  Adriana Passaseo,et al.  Evidence of “crossed” transitions in dots-in-a-well structures through waveguide absorption measurements , 2008 .

[10]  A. Salvador,et al.  Interband dot-to-well transitions in InAs∕InGaAs dots in a well probed via photocurrent and electroluminescence spectroscopy , 2008 .

[11]  Andrei Schliwa,et al.  Impact of size, shape, and composition on piezoelectric effects and electronic properties of In ( Ga ) As ∕ Ga As quantum dots , 2007 .

[12]  G. Bastard,et al.  Unbound states in quantum heterostructures , 2006, Nanoscale Research Letters.

[13]  Subhananda Chakrabarti,et al.  Characteristics of a tunneling quantum-dot infrared photodetector operating at room temperature , 2005 .

[14]  Calvin Curtis,et al.  Absorption cross-section and related optical properties of colloidal InAs quantum dots. , 2005, The journal of physical chemistry. B.

[15]  A. Zunger,et al.  Dependence of the electronic structure of self-assembled (In,Ga)As∕GaAs quantum dots on height and composition , 2005, cond-mat/0502409.

[16]  M. S. Skolnick,et al.  SELF-ASSEMBLED SEMICONDUCTOR QUANTUM DOTS: Fundamental Physics and Device Applications , 2004 .

[17]  M. Hopkinson,et al.  Continuum transitions and phonon coupling in single self-assembled Stranski-Krastanow quantum dots , 2003 .

[18]  S. Noh,et al.  Dependence of the heavy-hole exciton reduced mass on quantum-well size in InGaAs/GaAs heterostructures , 2003 .

[19]  A. Vasanelli,et al.  Continuous absorption background and decoherence in quantum dots. , 2002, Physical review letters.

[20]  C. Voisin,et al.  Photoluminescence up-conversion in single self-assembled InAs/GaAs quantum dots. , 2001, Physical review letters.

[21]  Thomas F. Krauss,et al.  Charged and neutral exciton complexes in individual self-assembled In(Ga)As quantum dots , 2001 .

[22]  J. A. Barker,et al.  Theoretical analysis of electron-hole alignment in InAs-GaAs quantum dots , 2000 .

[23]  M. S. Skolnick,et al.  Inverted electron-hole alignment in InAs-GaAs self-assembled quantum dots. , 2000, Physical review letters.

[24]  Y. Arakawa,et al.  EFFICIENT CARRIER RELAXATION MECHANISM IN INGAAS/GAAS SELF-ASSEMBLED QUANTUM DOTS BASED ON THE EXISTENCE OF CONTINUUM STATES , 1999 .

[25]  Ferreira,et al.  Resonances in the excitonic transfer in biased double quantum wells. , 1990, Physical review. B, Condensed matter.