The experimental setup for pump-probe spectroscopy. Code: AOM: acousto-optic modulator. : polarizer. : plate. PD: photodiode. : delay stage. CDS: control and detection system. , : prism pair for pulse compression. Both solid and dashed lines represent the laser beam paths and the dotted lines stand for the electrical signal connection. Inset: is the angle between the -axis of the samples and the polarization of the pump (or probe) pulses. is the angle between the surface of samples and the polarization of the pump (or probe) pulses.
(Color online) Schematic illustrations of the geometric relation between the polarized light and the two-dimensional (2D) charges in an anisotropic structure. , , and are the charges along the axis, axis, and diagonal, respectively. , , and are the wave vectors of the polarized light. is the angle between the axis and field.
(Color online) semilogarithmic plots of vs pump-probe delay time at 60 K on various crystalline orientations. The signal in the -axis configuration was measured for (100) YBCO films by the polarized light with the wave vector shown in Fig. 2(b). The signal in the -diagonal configuration was measured for (110) YBCO films by the polarized light with the wave vector shown in Fig. 2(c). The solid lines are guides to the eye emphasizing the relaxation behavior of the photoinduced carriers along various crystalline orientations. Inset: signal measured at 70 K for a (001)YBCO thin film in several configurations with different angle between the axis and field [Fig. 2(a)] presented on a semilogarithmic scale.
(Color online) 2D distribution of the amplitude of as a function of the reduced temperature on the plane of YBCO. Inside the dashed circle is the superconducting zone where the temperature is below .
The driven charges under various polarization configurations in Fig. 2(a).
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