Interwell and intrawell magnetoexcitons in GaAs/AlGaAs                superlattices

V. B. Timofeev; A. I. Filin; A. I. Tartakovskii; Dan Birkedal; Jørn Marcher Hvam

doi:10.1002/1521-396X(199711)164:1<595::AID-PSSA595>3.0.CO;2-1

Interwell and intrawell magnetoexcitons in GaAs/AlGaAs superlattices

V. B. Timofeev, A. I. Filin, A. I. Tartakovskii, Dan Birkedal, Jørn Marcher Hvam

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Abstract

The formation of spatially indirect (interwell) excitons in superlattices (SLs) with different barrier widths (different tunneling coupling) is experimentally investigated in a strong enough magnetic field with the use of photoluminescence (PL), photoluminescence excitation (PLE), reflectance spec tra and time-resolved technique. The experimental conditions for the observation of interwell excitons in SLs without externally breaking inversion symmetry are identified and the distinct excitonic state is found to be located between Is-exciton and the onset of the miniband absorption. Magnetic field; perpendicular to the layers, strongly modifies the interwell and intrawell excitonic states and transforms the system to the weak coupling regime. The effect of interwell exciton conversion into intrawell one due to exciton-exciton collisions has been observed at a high excitation regime and confirmed by time-resolved spectroscopy experiments under pulsed picosecond excitation.

Original language	English
Journal	PHYSICA STATUS SOLIDI A-APPLIED RESEARCH
Volume	164
Issue number	1
Pages (from-to)	595-600
ISSN	0031-8965
DOIs	https://doi.org/10.1002/1521-396X(199711)164:1<595::AID-PSSA595>3.0.CO;2-1
Publication status	Published - 1997

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title = "Interwell and intrawell magnetoexcitons in GaAs/AlGaAs superlattices",

abstract = "The formation of spatially indirect (interwell) excitons in superlattices (SLs) with different barrier widths (different tunneling coupling) is experimentally investigated in a strong enough magnetic field with the use of photoluminescence (PL), photoluminescence excitation (PLE), reflectance spec tra and time-resolved technique. The experimental conditions for the observation of interwell excitons in SLs without externally breaking inversion symmetry are identified and the distinct excitonic state is found to be located between Is-exciton and the onset of the miniband absorption. Magnetic field; perpendicular to the layers, strongly modifies the interwell and intrawell excitonic states and transforms the system to the weak coupling regime. The effect of interwell exciton conversion into intrawell one due to exciton-exciton collisions has been observed at a high excitation regime and confirmed by time-resolved spectroscopy experiments under pulsed picosecond excitation.",

author = "Timofeev, {V. B.} and Filin, {A. I.} and Tartakovskii, {A. I.} and Dan Birkedal and Hvam, {J{\o}rn Marcher}",

year = "1997",

doi = "10.1002/1521-396X(199711)164:1<595::AID-PSSA595>3.0.CO;2-1",

language = "English",

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TY - JOUR

T1 - Interwell and intrawell magnetoexcitons in GaAs/AlGaAs superlattices

AU - Timofeev, V. B.

AU - Filin, A. I.

AU - Tartakovskii, A. I.

AU - Birkedal, Dan

AU - Hvam, Jørn Marcher

PY - 1997

Y1 - 1997

N2 - The formation of spatially indirect (interwell) excitons in superlattices (SLs) with different barrier widths (different tunneling coupling) is experimentally investigated in a strong enough magnetic field with the use of photoluminescence (PL), photoluminescence excitation (PLE), reflectance spec tra and time-resolved technique. The experimental conditions for the observation of interwell excitons in SLs without externally breaking inversion symmetry are identified and the distinct excitonic state is found to be located between Is-exciton and the onset of the miniband absorption. Magnetic field; perpendicular to the layers, strongly modifies the interwell and intrawell excitonic states and transforms the system to the weak coupling regime. The effect of interwell exciton conversion into intrawell one due to exciton-exciton collisions has been observed at a high excitation regime and confirmed by time-resolved spectroscopy experiments under pulsed picosecond excitation.

AB - The formation of spatially indirect (interwell) excitons in superlattices (SLs) with different barrier widths (different tunneling coupling) is experimentally investigated in a strong enough magnetic field with the use of photoluminescence (PL), photoluminescence excitation (PLE), reflectance spec tra and time-resolved technique. The experimental conditions for the observation of interwell excitons in SLs without externally breaking inversion symmetry are identified and the distinct excitonic state is found to be located between Is-exciton and the onset of the miniband absorption. Magnetic field; perpendicular to the layers, strongly modifies the interwell and intrawell excitonic states and transforms the system to the weak coupling regime. The effect of interwell exciton conversion into intrawell one due to exciton-exciton collisions has been observed at a high excitation regime and confirmed by time-resolved spectroscopy experiments under pulsed picosecond excitation.

U2 - 10.1002/1521-396X(199711)164:1<595::AID-PSSA595>3.0.CO;2-1

DO - 10.1002/1521-396X(199711)164:1<595::AID-PSSA595>3.0.CO;2-1

M3 - Journal article

SN - 0031-8965

VL - 164

SP - 595

EP - 600

JO - PHYSICA STATUS SOLIDI A-APPLIED RESEARCH

JF - PHYSICA STATUS SOLIDI A-APPLIED RESEARCH

IS - 1

ER -

Interwell and intrawell magnetoexcitons in GaAs/AlGaAs superlattices

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