Concept

Quantum wire

Related publications (87)

Photoluminescence spectra and level repulsion in quantum wires

Benoît Marie Joseph Deveaud, Vincenzo Savona, Andrea Crottini, Andrea Feltrin, Xiao Wang

Luminescence spectra of V-groove GaAs/AlGaAs quantum wires are investigated by spatially resolved photoluminescence (PL) spectroscopy using a low temperature scanning near-field optical microscope (SNOM). The statistical analysis of these spectra in terms ...

V C H PUBLISHERS, SUITE 909, 220 E 23RD ST, NEW YORK, NY 10010 USA2004

About some optical properties of AlxGa1-xN/GaN quantum wells grown by molecular beam epitaxy

Nicolas Grandjean

Wurtzitic nitride quantum wells grown along the (0001) axis experience a large Stark effect induced by the differences of spontaneous and piezoelectric polarizations between the well and barrier materials. In AlxGa1-xN/GaN quantum wells, due to the adverse ...

2004

Temperature dependence of the photoluminescence lifetime in disordered quantum wires

Benoît Marie Joseph Deveaud, Vincenzo Savona, Andrea Feltrin

We present a theoretical model of the time-resolved excitonic photoluminescence in quantum wires. We study the role of disorder on the temperature dependence of the photoluminescence lifetime. We find that at low temperature the exciton population is not t ...

V C H PUBLISHERS, SUITE 909, 220 E 23RD ST, NEW YORK, NY 10010 USA2004

Fluorescence yield and lifetime of isolated polydiacetylene chains: Evidence for a one-dimensional exciton band in a conjugated polymer

Jean-Daniel Ganière

The fluorescence lifetime tau and quantum yield eta(f) of isolated red polydiacetylene chains dispersed in their monomer single crystal matrix were measured between 10 and 100 K. tau increases up to 120 ps at 40 K, then rapidly decreases at higher T. eta(f ...

2002

One-dimensional biexcitons in a single quantum wire

Benoît Marie Joseph Deveaud, Andrea Crottini, Xiao Wang

We report the direct observation of one-dimensional (ID) excitonic molecules (biexcitons) in high quality disorder free semiconductor quantum wires. By means of spatially resolved near-field photoluminescence spectroscopy, we detected delocalized 1D excito ...

2002

The band structure of Z-like quantum wires

Marc-André Dupertuis, Daniel Marti

We analyze the electronic properties of quantum wires with a Z-like profile within four-band models for the valence band of a semiconductor of diamond and zinc blende type. Group-theoretical considerations show that the valence-band structure is doubly deg ...

2002

Efficient, narrow linewidth excitonic emission at room temperature from GaAs/AlGaAs V-groove quantum wire light-emitting diodes

Elyahou Kapon, Alok Rudra, Marc-André Dupertuis

We report on efficient, narrow linewidth exciton recombination in GaAs/AlGaAs V-groove quantum wire light-emitting diodes at room temperature. The high efficiency is due to a selective carrier injection mechanism resulting in an estimated internal quantum ...

2001

Near-field imaging of one-dimensional excitons delocalized over mesoscopic distances

Benoît Marie Joseph Deveaud, Andrea Crottini, Xiao Wang

Near-field optical spectroscopy is used to investigate the effects of disorder in the optical processes in semiconductor quantum wires. We observe photoluminescence emissions from extended, delocalized excitons at low temperatures (5 K) and low excitation ...

2001

Separation of strain and quantum-confinement effects in the optical spectra of quantum wires

Elyahou Kapon, Marc-André Dupertuis

The photoluminescence (PL) and PL-excitation (PLE) spectra of InyCa1-yAs/AlxGa1-xAs compressively strained V-groove quantum wires (QWR's) are compared to that of lattice-matched GaAs/AlyGa1-xAs QWR's with the same wire geometry. The PL is preferentially po ...

2000

Consequences of low symmetry in quantum wires: Exciton degeneracies and quasi-equilibrium high-density regime

Marc-André Dupertuis

We analyze the role of the confinement potential symmetry on the optical properties of quantum wires in the high-density regime. Within the Hartree-Fock approximation we go beyond a global group-theoretical analysis and analyse the structural details of th ...

2000

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