Positron trapping at a negatively charged as vacancy in GaAs

L. Gilgien; G. Galli; F. Gygi; R. Car; R. Ambigapathy; A. A. Manuel

Positron trapping at a negatively charged as vacancy in GaAs

L. Gilgien, G. Galli, F. Gygi, R. Car, R. Ambigapathy, A. A. Manuel

Research output: Contribution to journal › Conference article › peer-review

Abstract

We present an ab initio study of positron trapping at a V_As^- vacancy in GaAs which self-consistently includes lattice relaxations induced by the positron. In the presence of a positron, the volume of the vacancy increases and its symmetry is lowered. The positron wavefunction is well localized in the defect and calculated positron lifetimes are in agreement with experiment. We also present a comparative study of measured and calculated 2D-ACAR spectra for the bulk and the V_As^- vacancy. The experimental and theoretical results are in good agreement and show remarkable differences between positrons annihilating in the bulk and the V_As^- vacancy.

Original language	English (US)
Pages (from-to)	363-366
Number of pages	4
Journal	Materials Science Forum
Volume	175-178
Issue number	pt 1
State	Published - 1995
Externally published	Yes
Event	Proceedings of the 10th International Conference on Positron Annihilation. Part 1 (of 2) - Beijing, China Duration: May 23 1994 → May 29 1994

All Science Journal Classification (ASJC) codes

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Cite this

@article{9d7dc690a6f2401cb5469c6b867d54b6,

title = "Positron trapping at a negatively charged as vacancy in GaAs",

abstract = "We present an ab initio study of positron trapping at a VAs- vacancy in GaAs which self-consistently includes lattice relaxations induced by the positron. In the presence of a positron, the volume of the vacancy increases and its symmetry is lowered. The positron wavefunction is well localized in the defect and calculated positron lifetimes are in agreement with experiment. We also present a comparative study of measured and calculated 2D-ACAR spectra for the bulk and the VAs- vacancy. The experimental and theoretical results are in good agreement and show remarkable differences between positrons annihilating in the bulk and the VAs- vacancy.",

author = "L. Gilgien and G. Galli and F. Gygi and R. Car and R. Ambigapathy and Manuel, {A. A.}",

year = "1995",

language = "English (US)",

volume = "175-178",

pages = "363--366",

journal = "Materials Science Forum",

issn = "0255-5476",

publisher = "Trans Tech Publications Ltd",

number = "pt 1",

note = "Proceedings of the 10th International Conference on Positron Annihilation. Part 1 (of 2) ; Conference date: 23-05-1994 Through 29-05-1994",

}

TY - JOUR

T1 - Positron trapping at a negatively charged as vacancy in GaAs

AU - Gilgien, L.

AU - Galli, G.

AU - Gygi, F.

AU - Car, R.

AU - Ambigapathy, R.

AU - Manuel, A. A.

PY - 1995

Y1 - 1995

N2 - We present an ab initio study of positron trapping at a VAs- vacancy in GaAs which self-consistently includes lattice relaxations induced by the positron. In the presence of a positron, the volume of the vacancy increases and its symmetry is lowered. The positron wavefunction is well localized in the defect and calculated positron lifetimes are in agreement with experiment. We also present a comparative study of measured and calculated 2D-ACAR spectra for the bulk and the VAs- vacancy. The experimental and theoretical results are in good agreement and show remarkable differences between positrons annihilating in the bulk and the VAs- vacancy.

AB - We present an ab initio study of positron trapping at a VAs- vacancy in GaAs which self-consistently includes lattice relaxations induced by the positron. In the presence of a positron, the volume of the vacancy increases and its symmetry is lowered. The positron wavefunction is well localized in the defect and calculated positron lifetimes are in agreement with experiment. We also present a comparative study of measured and calculated 2D-ACAR spectra for the bulk and the VAs- vacancy. The experimental and theoretical results are in good agreement and show remarkable differences between positrons annihilating in the bulk and the VAs- vacancy.

UR - http://www.scopus.com/inward/record.url?scp=0029211106&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0029211106&partnerID=8YFLogxK

M3 - Conference article

AN - SCOPUS:0029211106

SN - 0255-5476

VL - 175-178

SP - 363

EP - 366

JO - Materials Science Forum

JF - Materials Science Forum

IS - pt 1

T2 - Proceedings of the 10th International Conference on Positron Annihilation. Part 1 (of 2)

Y2 - 23 May 1994 through 29 May 1994

ER -

Positron trapping at a negatively charged as vacancy in GaAs

Abstract

All Science Journal Classification (ASJC) codes

Other files and links

Fingerprint

Cite this