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Interplay between carrier and impurity concentrations in annealed Ga$_{1-x}$Mn$_{x}$As intrinsic anomalous Hall Effect

Autor: Chun, S. H., Kim, Y. S., Choi, H. K., Jeong, I. T., Lee, W. O., Suh, K. S., OH, Y. S., Kim, K. H., Khim, Z. G., Woo, J. C., Park, Y. D.

Investigating the scaling behavior of annealed Ga$_{1-x}$Mn$_{x}$As anomalous Hall coefficients, we note a universal crossover regime where the scaling behavior changes from quadratic to linear, attributed to the anomalous Hall Effect intrinsic and e

Externí odkaz: http://arxiv.org/abs/cond-mat/0603808

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Evidence of metallic clustering in annealed Ga1-xMnxAs from atypical scaling behavior of the anomalous Hall coefficient

Autor: Choi, H. K., Lee, W. O., OH, Y. S., Kim, K. H., Park, Y. D., Seo, S. S. A., Noh, T. W., Kim, Y. S., Khim, Z. G., Jeong, I. T., Woo, J. C., Chun, S. H.

We report on the anomalous Hall coefficient and longitudinal resistivity scaling relationships on a series of annealed Ga1-xMnxAs epilayers (x~0.055). As-grown samples exhibit scaling parameter n of ~ 1. Near the optimal annealing temperature, we fin

Externí odkaz: http://arxiv.org/abs/cond-mat/0603468

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Near-field spectroscopy of bimodal size distribution of InAs/AlGaAs quantum dots

Autor: Yu, Young-Jun, Jeong, I. T., Woo, J. C., Jhe, Wonho

We report on high-resolution photoluminescence (PL) spectroscopy of spatial structure of InAs/AlGaAs quantum dots (QDs) by using a near-field scanning optical microscope (NSOM). The double-peaked distribution of PL spectra is clearly observed, which

Externí odkaz: http://arxiv.org/abs/physics/0504030

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Near-field photoluminescence study of InAs/AlGaAs quantum-dot-based nanoclusters: band filling effect

Autor: Yu, Young-Jun, Noh, Han-Eol, Hong, Mun-Heon, Jeong, I. T., Woo, J. C., Park, Yeonsang, Jeon, Heonsu, Jhe, Wonho

We have performed near-field spectroscopy and microscopy of the InAs/AlGaAs quantum-dot-based nanoclusters. It is observed that the photoluminescence spectra of spatially confined excitons in the nanoclusters is blue-shifted up to 20 meV as the power

Externí odkaz: http://arxiv.org/abs/physics/0503211

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Spin-Landau Orbit Coupling in Units of the Flux Quantum Observed from Zeeman Splitting of a Quantum Wire Array

Autor: Woo, J. C., Kim, W. S., Ko, H. S., Leem, Y. A., Kim, Y. S., Kim, D. S., Choi, M. Y., Kim, D. H., Schmiedel, T.

In Zeeman spectra of a GaAs-AlGaAs quantum wire array with superlattice period lp, the zero-field shift is found to increase in steps of (2 pi hbar/ e)lp^{-2} at the cyclotron radius Rc ~lp, lp/2, and lp/3. This shift, caused by spin-Landau orbit cou

Externí odkaz: http://arxiv.org/abs/cond-mat/9804135

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