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Dresselhaus field-induced anisotropic spin propagation in ZnSe/BeTe type-II quantum wells
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View: Figures


Image of FIG. 1.
FIG. 1.

Experimental setup for scanning microscopy in PCD measurement.

Image of FIG. 2.
FIG. 2.

(Color online) (a) Time-resolved PCD signals for the ZnSe/BeTe QWs at room temperature at different positions of the pump spot. Coordinate (x,y) indicates the position of the pump spot in the coordinate system when the probe spot is located at the origin and the y-axis is along the magnetic field. (b), (c) 2D images of the PCD signals in the region of 6.9 × 7.8 μm, observed at different time delays 0.05 ns (b), and 0.75 ns (c). The arrow B denotes the direction of the external magnetic field.

Image of FIG. 3.
FIG. 3.

(Color online) (a), (b) 2D images of additional magnetic field , measured by the precession frequency deviation of the PCD signal at each detecting position from the pump spot, under the (a) and [010] (b) magnetic fields. (c)–(e) Schematic view of uniform the external field () (c), Dresselhaus field (d), and net field (e) for the electrons positioning at different directions in k space.

Image of FIG. 4.
FIG. 4.

(a) Spatial profiles of photo-generated carrier distribution, photo-induced spin polarization and the laser spot. The solid and dotted lines show the carrier distribution observed at time delays of 0.05 and 12.9 ns, respectively. The gray line is the profile of photo-injected spin polarization at a time delay 0.05 ns, shown in Fig. 2(b). (b) Dresselhaus field (closed circles) obtained from the deviation of spin precession frequency at different pump-probe distances under the magnetic field and the electron density gradient (a gray line) calculated from the carrier distribution at a time delay of 0.05 ns.


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Scitation: Dresselhaus field-induced anisotropic spin propagation in ZnSe/BeTe type-II quantum wells