Journal
PHYSICAL REVIEW B
Volume 78, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.233308
Keywords
effective mass; electronic density of states; exchange interactions (electron); II-VI semiconductors; Landau levels; magnesium compounds; magnetic susceptibility; semiconductor epitaxial layers; semiconductor heterojunctions; Shubnikov-de Haas effect; two-dimensional electron gas; wide band gap semiconductors; zinc compounds
Funding
- Global COE Materials Integration Program
- Tohoku University
- Japan Society for the Promotion of Science (JSPS)
- Asahi Glass Foundation
- NSF
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We report measurements of the spin susceptibility and the electron effective mass for two-dimensional electrons confined at the interfaces of MgxZn1-xO/ZnO single heterostructures (x=0.05, 0.08, and 0.11), grown by molecular-beam epitaxy on (0001) ZnO substrates. By tuning the built-in polarization through control of the barrier composition, the electron density was systematically varied in the range of 5.6x10(11)-1.6x10(12) cm(-2), corresponding to a range of 3.1 <= r(s)<= 5.2, where r(s) is the average electron spacing measured in units of the effective Bohr radius. We used the coincidence technique, where crossings of the spin-split Landau levels occur at critical tilt angles of magnetic field, to evaluate the spin susceptibility. In addition, we determined the effective mass from the temperature dependence of the Shubnikov-de Haas oscillations measured at the coincidence conditions. The susceptibility and the effective mass both gradually increase with decreasing electron density, reflecting the role of electron-electron interaction.
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