DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: On the parabolicity of dipolar exciton traps and their population of excess charge carriers

Abstract

Abstract We study spatially trapped ensembles of dipolar excitons in coupled quantum wells by means of photoluminescence and photocurrent spectroscopy. The photogenerated excitons are confined in very clean GaAs double quantum well structures and electrostatically trapped by local gate electrodes. We find that the common approach of electrostatic trap geometries can give rise to an in-plane imbalance of charge carriers especially when an over-barrier excitation is utilized. The excess charge carriers can give rise to an effective parabolic confinement potential for the excitons. In photoluminescence spectra, we identify the emission of both neutral indirect excitons and states influenced by the excess charge carrier density. We find that the charge imbalance in the excitonic ensemble strongly influences the radiative lifetimes of both. Our findings shine a new light on the properties of trapped dipolar exciton ensembles. This is of significant relevance to common interpretations of experimental results in terms of signatures for the formation of ‘dark’ and ‘gray’ excitonic condensates.

Authors:
; ; ; ; ; ; ORCiD logo;
Publication Date:
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1527214
Resource Type:
Published Article
Journal Name:
New Journal of Physics
Additional Journal Information:
Journal Name: New Journal of Physics Journal Volume: 21 Journal Issue: 6; Journal ID: ISSN 1367-2630
Publisher:
IOP Publishing
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Dietl, S., Sigl, L., Sponfeldner, L., Gardner, G., Manfra, M., Kotthaus, J. P., Wurstbauer, U., and Holleitner, A. W. On the parabolicity of dipolar exciton traps and their population of excess charge carriers. United Kingdom: N. p., 2019. Web. doi:10.1088/1367-2630/ab1c89.
Dietl, S., Sigl, L., Sponfeldner, L., Gardner, G., Manfra, M., Kotthaus, J. P., Wurstbauer, U., & Holleitner, A. W. On the parabolicity of dipolar exciton traps and their population of excess charge carriers. United Kingdom. https://doi.org/10.1088/1367-2630/ab1c89
Dietl, S., Sigl, L., Sponfeldner, L., Gardner, G., Manfra, M., Kotthaus, J. P., Wurstbauer, U., and Holleitner, A. W. Thu . "On the parabolicity of dipolar exciton traps and their population of excess charge carriers". United Kingdom. https://doi.org/10.1088/1367-2630/ab1c89.
@article{osti_1527214,
title = {On the parabolicity of dipolar exciton traps and their population of excess charge carriers},
author = {Dietl, S. and Sigl, L. and Sponfeldner, L. and Gardner, G. and Manfra, M. and Kotthaus, J. P. and Wurstbauer, U. and Holleitner, A. W.},
abstractNote = {Abstract We study spatially trapped ensembles of dipolar excitons in coupled quantum wells by means of photoluminescence and photocurrent spectroscopy. The photogenerated excitons are confined in very clean GaAs double quantum well structures and electrostatically trapped by local gate electrodes. We find that the common approach of electrostatic trap geometries can give rise to an in-plane imbalance of charge carriers especially when an over-barrier excitation is utilized. The excess charge carriers can give rise to an effective parabolic confinement potential for the excitons. In photoluminescence spectra, we identify the emission of both neutral indirect excitons and states influenced by the excess charge carrier density. We find that the charge imbalance in the excitonic ensemble strongly influences the radiative lifetimes of both. Our findings shine a new light on the properties of trapped dipolar exciton ensembles. This is of significant relevance to common interpretations of experimental results in terms of signatures for the formation of ‘dark’ and ‘gray’ excitonic condensates.},
doi = {10.1088/1367-2630/ab1c89},
journal = {New Journal of Physics},
number = 6,
volume = 21,
place = {United Kingdom},
year = {Thu Jun 20 00:00:00 EDT 2019},
month = {Thu Jun 20 00:00:00 EDT 2019}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1088/1367-2630/ab1c89

Citation Metrics:
Cited by: 1 work
Citation information provided by
Web of Science

Save / Share:

Works referenced in this record:

Observation of Bose-Einstein Condensation in a Dilute Atomic Vapor
journal, July 1995


Dark High Density Dipolar Liquid of Excitons
journal, May 2016


Quantum Hall signatures of dipolar Mahan excitons
journal, January 2013


Comment on “Photoluminescence Ring Formation in Coupled Quantum Wells: Excitonic Versus Ambipolar Diffusion”
journal, April 2010


Bose-Einstein Condensation of Microcavity Polaritons in a Trap
journal, May 2007


Spectroscopic signatures for the dark Bose-Einstein condensation of spatially indirect excitons
journal, August 2017


Exciton and trion spectral line shape in the presence of an electron gas in GaAs/AlAs quantum wells
journal, October 1996


Excitons and excitonic complexes in GaAs/AlGaAs quantum wells with a low-density quasi-two-dimensional electron and hole channel
journal, May 1998

  • Volkov, O. V.; Zhitomirskii, V. E.; Kukushkin, I. V.
  • Journal of Experimental and Theoretical Physics Letters, Vol. 67, Issue 9
  • DOI: 10.1134/1.567741

Bose-Einstein Condensation in Semiconductors: The Key Role of Dark Excitons
journal, October 2007


Towards Bose–Einstein condensation of excitons in potential traps
journal, May 2002

  • Butov, L. V.; Lai, C. W.; Ivanov, A. L.
  • Nature, Vol. 417, Issue 6884
  • DOI: 10.1038/417047a

Fermi polaron-polaritons in charge-tunable atomically thin semiconductors
journal, October 2016

  • Sidler, Meinrad; Back, Patrick; Cotlet, Ovidiu
  • Nature Physics, Vol. 13, Issue 3
  • DOI: 10.1038/nphys3949

Bose-Einstein Condensation in a Gas of Sodium Atoms
journal, November 1995


Emission of Cu2O Paraexcitons Confined by a Strain Trap: Hints of a Bose–Einstein Condensate?
journal, August 2018


Bose–Einstein condensation and indirect excitons: a review
journal, March 2017

  • Combescot, Monique; Combescot, Roland; Dubin, François
  • Reports on Progress in Physics, Vol. 80, Issue 6
  • DOI: 10.1088/1361-6633/aa50e3

Selective confinement of macroscopic long-lifetime exciton and trion populations
journal, December 2011


Trapping Indirect Excitons in a GaAs Quantum-Well Structure with a Diamond-Shaped Electrostatic Trap
journal, August 2009


Photonic-crystal exciton-polaritons in monolayer semiconductors
journal, February 2018


Dressed state dynamics of two-component Bose-Einstein Condensates in state-dependent potentials
journal, March 2018


Confinement and Interaction of Single Indirect Excitons in a Voltage-Controlled Trap Formed Inside Double InGaAs Quantum Wells
journal, March 2013


Confocal shift interferometry of coherent emission from trapped dipolar excitons
journal, December 2014

  • Repp, J.; Schinner, G. J.; Schubert, E.
  • Applied Physics Letters, Vol. 105, Issue 24
  • DOI: 10.1063/1.4904222

Dynamical Control over the Confinement of Spatially Indirect Excitons in Electrostatic Traps Composed of Coupled GaAs Quantum Wells
journal, November 2017


Condensation of excitons in Cu 2 O at ultracold temperatures: experiment and theory
journal, October 2012


Effect of screening by two-dimensional charge carriers on the binding energy of excitonic states in GaAs/AlGaAs quantum wells
journal, November 2002

  • Gubarev, S. I.; Volkov, O. V.; Koval’skii, V. A.
  • Journal of Experimental and Theoretical Physics Letters, Vol. 76, Issue 9
  • DOI: 10.1134/1.1538293

Collective electronic excitation in a trapped ensemble of photogenerated dipolar excitons and free holes revealed by inelastic light scattering
journal, February 2017


Analysis of the exciton-exciton interaction in semiconductor quantum wells
journal, July 2008


Excitons in electrostatic traps
journal, March 2006

  • Hammack, A. T.; Gippius, N. A.; Yang, Sen
  • Journal of Applied Physics, Vol. 99, Issue 6
  • DOI: 10.1063/1.2181276

Exciton Liquid in Coupled Quantum Wells
journal, January 2014


Photoluminescence and radiative lifetime of trions in GaAs quantum wells
journal, September 2000


Free and localized positively charged excitons in the emission spectrum of GaAs/AlGaAs quantum wells
journal, August 1998

  • Volkov, O. V.; Kukushkin, I. V.; von Klitzing, K.
  • Journal of Experimental and Theoretical Physics Letters, Vol. 68, Issue 3
  • DOI: 10.1134/1.567852

Many-body theory of trion absorption features in two-dimensional semiconductors
journal, January 2017


Imaging interferometry of excitons in two-dimensional structures: can it detect exciton coherence
journal, December 2017

  • Stolz, Heinrich; Dietl, Maria; Schwartz, Rico
  • Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 51, Issue 2
  • DOI: 10.1088/1361-6455/aa9f5d

Quantum Phase Transition in a Two-Dimensional System of Dipoles
journal, February 2007


Exciton–polariton condensates
journal, October 2014

  • Byrnes, Tim; Kim, Na Young; Yamamoto, Yoshihisa
  • Nature Physics, Vol. 10, Issue 11
  • DOI: 10.1038/nphys3143

Correlations in a two-dimensional Bose gas with long-range interaction
journal, July 2009


Radiative behavior of negatively charged excitons in CdTe-based quantum wells: A spectral and temporal analysis
journal, December 2000


Two-dimensional snowflake trap for indirect excitons
journal, January 2015

  • Kuznetsova, Y. Y.; Andreakou, P.; Hasling, M. W.
  • Optics Letters, Vol. 40, Issue 4
  • DOI: 10.1364/OL.40.000589

Electrostatic traps for dipolar excitons
journal, August 2005


Radiative lifetimes of dipolar excitons in double quantum wells
journal, April 2017


Collision broadening of two-dimensional excitons in a GaAs single quantum well
journal, September 1989


Special issue on addressing many-body problems with cold atoms and molecules
journal, December 2017

  • Ohmori, Kenji; Pupillo, Guido; Thywissen, Joseph H.
  • Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 51, Issue 2
  • DOI: 10.1088/1361-6455/aa9d13

Dipolar excitons in a potential trap in a magnetic field
journal, July 2014

  • Gorbunov, A. V.; Timofeev, V. B.
  • Journal of Experimental and Theoretical Physics, Vol. 119, Issue 1
  • DOI: 10.1134/S1063776114060119

Theory of transient excitonic optical nonlinearities in semiconductor quantum-well structures
journal, November 1985


Experimental methods and analysis of cold and dense dipolar exciton fluids
journal, June 2007


Formation Mechanism and Low-Temperature Instability of Exciton Rings
journal, March 2004


Theory of neutral and charged exciton scattering with electrons in semiconductor quantum wells
journal, January 2003


Split-gate device for indirect excitons
journal, April 2018

  • Dorow, C. J.; Leonard, J. R.; Fogler, M. M.
  • Applied Physics Letters, Vol. 112, Issue 18
  • DOI: 10.1063/1.5021488

Artificial trapping of a stable high-density dipolar exciton fluid
journal, July 2006


Condensation of Excitons in a Trap
journal, April 2012

  • High, A. A.; Leonard, J. R.; Remeika, M.
  • Nano Letters, Vol. 12, Issue 5
  • DOI: 10.1021/nl300983n

Quenching of excitonic optical transitions by excess electrons in GaAs quantum wells
journal, June 1995


Binding energies of positive and negative trions: From quantum wells to quantum dots
journal, July 2005


Dynamics of long-living excitons in tunable potential landscapes
journal, May 2006

  • Gärtner, Andreas; Schuh, Dieter; Kotthaus, Jörg P.
  • Physica E: Low-dimensional Systems and Nanostructures, Vol. 32, Issue 1-2
  • DOI: 10.1016/j.physe.2005.12.036

Effect of Electron-Exciton Collisions on the Free-Exciton Linewidth in Epitaxial GaAs
journal, December 1969


Trions in GaAs quantum wells
journal, May 2005


Tunable Photoemission from an Excitonic Antitrap
journal, December 2011

  • Kowalik-Seidl, Katarzyna; Vögele, Xaver P.; Rimpfl, Bernhard N.
  • Nano Letters, Vol. 12, Issue 1
  • DOI: 10.1021/nl203613k

Forming and confining of dipolar excitons by quantizing magnetic fields
journal, February 2011


Macroscopically ordered state in an exciton system
journal, August 2002

  • Butov, L. V.; Gossard, A. C.; Chemla, D. S.
  • Nature, Vol. 418, Issue 6899
  • DOI: 10.1038/nature00943

Bose–Einstein condensation of exciton polaritons
journal, September 2006

  • Kasprzak, J.; Richard, M.; Kundermann, S.
  • Nature, Vol. 443, Issue 7110
  • DOI: 10.1038/nature05131

When should we say we have observed Bose condensation of excitons?
journal, August 2003


Ultrafast Phase Relaxation of Excitons via Exciton-Exciton and Exciton-Electron Collisions
journal, September 1986


Optical Spectroscopy of a Two-Dimensional Electron Gas near the Metal-Insulator Transition
journal, February 1995

  • Finkelstein, Gleb; Shtrikman, Hadas; Bar-Joseph, Israel
  • Physical Review Letters, Vol. 74, Issue 6
  • DOI: 10.1103/PhysRevLett.74.976

Optically programmable excitonic traps
journal, April 2013

  • Alloing, Mathieu; Lemaître, Aristide; Galopin, Elisabeth
  • Scientific Reports, Vol. 3, Issue 1
  • DOI: 10.1038/srep01578

Coherence and Optical Emission from Bilayer Exciton Condensates
journal, January 2011


Charged and neutral excitonic complexes in GaAs/AlGaAs quantum wells
journal, December 1997

  • Volkov, O. V.; Zhitomirskii, V. E.; Kukushkin, I. V.
  • Journal of Experimental and Theoretical Physics Letters, Vol. 66, Issue 11
  • DOI: 10.1134/1.567595

Electrostatically trapping indirect excitons in coupled In x Ga 1 x As quantum wells
journal, April 2011


Dynamics of excitons in a potential trap at ultra-low temperatures: paraexcitons in Cu 2 O
journal, February 2012


Neutral and positively charged excitons: A magneto-optical study of a p -doped Cd 1 x Mn x Te quantum well
journal, December 1999


Tightly bound trions in monolayer MoS2
journal, December 2012

  • Mak, Kin Fai; He, Keliang; Lee, Changgu
  • Nature Materials, Vol. 12, Issue 3
  • DOI: 10.1038/nmat3505

Observation of negatively charged excitons X in semiconductor quantum wells
journal, September 1993


Long-lived spin coherence of indirect excitons in GaAs coupled quantum wells
journal, April 2015


Stability of trions in coupled quantum wells modeled by two-dimensional bilayers
journal, February 2018


Dynamics of indirect exciton transport by moving acoustic fields
journal, March 2014


Overflow of a dipolar exciton trap at high magnetic fields
journal, August 2017


The search for Bose–Einstein condensation of excitons in Cu 2 O: exciton-Auger recombination versus biexciton formation
journal, December 2014


Magnetotransport in C-doped AlGaAs heterostructures
journal, September 2004

  • Grbić, B.; Ellenberger, C.; Ihn, T.
  • Applied Physics Letters, Vol. 85, Issue 12
  • DOI: 10.1063/1.1781750

Negatively and positively charged excitons in GaAs / Al x Ga 1 x As quantum wells
journal, January 1996