Positron confinement in ultrafine embedded particles: Quantum-dot-like state in an Fe-Cu alloy

Y. Nagai, M. Hasegawa

Research output: Contribution to journalArticle

190 Citations (Scopus)

Abstract

A quantum-dot-like positron state is demonstrated in the “defect-free” particles using coincidence Doppler broadening of positron annihilation radiation. The wave functions of all positrons are entirely confined spatially in all three directions within the embedded nanosize and subnanosize Cu particles in a dilute Fe-Cu alloy. With use of this probe, the ultrafine particles are revealed to have nearly the same electron momentum distribution as bulk Cu, to be free from Fe atoms and defects, three dimensional, and to have no open-volume defects at the interfaces which can trap the positron. These successes indicate that this positron state promises to be a powerful tool for the studies of mesoscopic systems in metals and semiconductors.

Original languageEnglish
Pages (from-to)6574-6578
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume61
Issue number10
DOIs
Publication statusPublished - 2000 Jan 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Positron confinement in ultrafine embedded particles: Quantum-dot-like state in an Fe-Cu alloy'. Together they form a unique fingerprint.

  • Cite this