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Lattice polarity detection of InN by circular photogalvanic effect
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View: Figures


Image of FIG. 1.
FIG. 1.

Photocurrent as a function of the quarter wave plate angle in typical -type In-polar InN in the CPGE measurement. Photocurrent data is fitted (blue solid line) by Eq. (1). It is shown that the photocurrent (blue solid line) is dominated by the CPGE current (red dashed line) while the LPGE current (red dotted line) is negligible small. A schematic diagram for measurement geometry is shown in the inset.

Image of FIG. 2.
FIG. 2.

Microscopic pictures of CPGE effect in In-polar and N-polar InN. [(a) and (b)] Atomic structures for In- and N-polar InN. [(c) and (d)] Two-dimensional cross-sectional band structure for In- and N-polar InN in -plane in the presence of Rashba type spin splitting. [(e) and (f)] Interband excitation in InN with In- and N-polarities. It is shown that the net current generated by oblique incidence right circularly polarized light is along and directions in the In- and N-polar InN, respectively.

Image of FIG. 3.
FIG. 3.

Photocurrents observed in four kinds of InN layers with different polarities as a function of quarter wave plate angle . Samples in (a)–(d) are -type In-polarity, -type N-polarity, -type In-polarity and -type N-polarity, respectively. Incidence angles are in all measurements.


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Scitation: Lattice polarity detection of InN by circular photogalvanic effect