Excitonic Aharonov-Bohm effect in isotopically pure {sup 70}Ge/Si self-assembled type-II quantum dots

Journal Article · Sun Aug 15 00:00:00 EDT 2010 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.82.073306· OSTI ID:21421392

Miyamoto, Satoru; Ishikawa, Toyofumi; Eto, Mikio; Itoh, Kohei M ^[1]; Moutanabbir, Oussama ^[1]; Haller, Eugene E ^[2]; Sawano, Kentarou; Shiraki, Yasuhiro ^[3]

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1. School of Fundamental Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522 (Japan)
2. Lawrence Berkeley National Laboratory and UC Berkeley, 1 Cyclotron Road, Berkeley, California 94720 (United States)
3. Research Center for Silicon Nano-Science, Advanced Research Laboratories, Tokyo City University, 8-15-1 Todoroki, Setagaya-ku, Tokyo 158-0082 (Japan)

We report on a magnetophotoluminescence study of isotopically pure {sup 70}Ge/Si self-assembled type-II quantum dots. Oscillatory behaviors attributed to the Aharonov-Bohm effect are simultaneously observed for the emission energy and intensity of excitons subject to an increasing magnetic field. When the magnetic flux penetrates through the ringlike trajectory of an electron moving around each quantum dot, the ground state of an exciton experiences a change in its angular momentum. Our results provide the experimental evidence for the phase coherence of localized electron wave functions in group-IV Ge/Si self-assembled quantum structures.

• OSTI ID: 21421392
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 82, Issue 7; Other Information: DOI: 10.1103/PhysRevB.82.073306; (c) 2010 The American Physical Society; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AHARONOV-BOHM EFFECT
ANGULAR MOMENTUM
ELECTRONS
EMISSION
EXCITONS
GERMANIUM 70
GROUND STATES
LAYERS
MAGNETIC FIELDS
MAGNETIC FLUX
MAGNETIC PROPERTIES
PHOTOLUMINESCENCE
QUANTUM DOTS
SILICON
WAVE FUNCTIONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY LEVELS
EVEN-EVEN NUCLEI
FERMIONS
FUNCTIONS
GERMANIUM ISOTOPES
INTERMEDIATE MASS NUCLEI
ISOTOPES
LEPTONS
LUMINESCENCE
NANOSTRUCTURES
NUCLEI
PHOTON EMISSION
PHYSICAL PROPERTIES
QUASI PARTICLES
SEMIMETALS
STABLE ISOTOPES