期刊
PHYSICAL REVIEW B
卷 92, 期 15, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.92.155402
关键词
-
资金
- U.S. DOE-BES, Office of Science [DE-SC0004890]
- [U.S. ONR N000141310754]
- [NSF-DMR 0907150]
In magnetically doped quantum dots, changing the carrier occupancy from open to closed shells leads to qualitatively different forms of carrier-mediated magnetic ordering. While it is common to study such nanoscale magnets within a mean-field approximation, excluding the spin fluctuations can mask important phenomena and lead to spurious thermodynamic phase transitions in small magnetic systems. By employing coarse-grained, variational, and Monte Carlo methods on singly and doubly occupied quantum dots to include spin fluctuations, we evaluate the relevance of the mean-field description and distinguish different finite-size scaling in nanoscale magnets.
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