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Large excitonic confinement in asymmetric quantum T wires

Publication ,  Journal Article
Hasen, J; Pfeiffer, LN; Pinczuk, A; Baranger, HU; West, KW; Dennis, BS
Published in: Superlattices and Microstructures
January 1, 1997

An asymmetric quantum T wire (QTWR) may be formed whenever two quantum wells (QW) of differing widths intersect. We measured the photoluminescence and photoluminescence excitation from such QTWRs using microscope optics with high spatial resolution. The introduction of an asymmetry in the design of the QWs allows us to compensate for the different effective masses of the heavy holes in the (100) and (110) directions. We find that the confinement energy for excitons in the asymmetric QTWR is 40 meV, which is greater than previously published reports on symmetric QTWRs. Consequently, the confinement energy exceeds kT at room temperature, which appeals to device applications. Furthermore, the confinement energy is greater than the LO phonon energy, a feature which may improve the capture rate of the QTWR and decrease the escape rate at higher temperatures. Finally, using the results from calculations, we estimate the binding energy of the exciton to be about 20 meV, which is substantially larger than the binding energy in QWs. This result agrees with theoretical predictions of an increase in exciton binding energy in ID confinement. © 1997 Academic Press Limited.

Duke Scholars

Published In

Superlattices and Microstructures

DOI

ISSN

0749-6036

Publication Date

January 1, 1997

Volume

22

Issue

3

Related Subject Headings

  • Applied Physics
  • 5104 Condensed matter physics
  • 5102 Atomic, molecular and optical physics
  • 4009 Electronics, sensors and digital hardware
  • 0206 Quantum Physics
  • 0205 Optical Physics
  • 0204 Condensed Matter Physics
 

Citation

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Hasen, J., Pfeiffer, L. N., Pinczuk, A., Baranger, H. U., West, K. W., & Dennis, B. S. (1997). Large excitonic confinement in asymmetric quantum T wires. Superlattices and Microstructures, 22(3). https://doi.org/10.1006/spmi.1996.0283
Hasen, J., L. N. Pfeiffer, A. Pinczuk, H. U. Baranger, K. W. West, and B. S. Dennis. “Large excitonic confinement in asymmetric quantum T wires.” Superlattices and Microstructures 22, no. 3 (January 1, 1997). https://doi.org/10.1006/spmi.1996.0283.
Hasen J, Pfeiffer LN, Pinczuk A, Baranger HU, West KW, Dennis BS. Large excitonic confinement in asymmetric quantum T wires. Superlattices and Microstructures. 1997 Jan 1;22(3).
Hasen, J., et al. “Large excitonic confinement in asymmetric quantum T wires.” Superlattices and Microstructures, vol. 22, no. 3, Jan. 1997. Scopus, doi:10.1006/spmi.1996.0283.
Hasen J, Pfeiffer LN, Pinczuk A, Baranger HU, West KW, Dennis BS. Large excitonic confinement in asymmetric quantum T wires. Superlattices and Microstructures. 1997 Jan 1;22(3).
Journal cover image

Published In

Superlattices and Microstructures

DOI

ISSN

0749-6036

Publication Date

January 1, 1997

Volume

22

Issue

3

Related Subject Headings

  • Applied Physics
  • 5104 Condensed matter physics
  • 5102 Atomic, molecular and optical physics
  • 4009 Electronics, sensors and digital hardware
  • 0206 Quantum Physics
  • 0205 Optical Physics
  • 0204 Condensed Matter Physics