Terahertz Radiation from Nonpolar InN Due to Drift in an Intrinsic In-Plane Electric Field
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چکیده
A sinusoidal dependence of the sand p-polarized terahertz (THz) emission on sample rotation angle in mand a-plane InN has been observed using ultrafast pulse excitation at a moderate pump fluence of 1 J/cm. The angular dependence is attributed to carrier drift in an intrinsic in-plane electric field parallel to the c-axis induced by stacking fault-terminated internal polarization at wurtzite domain boundaries, with a THz polarity flip corresponding to a reversal of the c-axis. The p-polarized THz signal also consists of an angular-independent component, similar to that from c-plane InN, consistent with surface normal transport due to the photo-Dember effect. # 2010 The Japan Society of Applied Physics
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تاریخ انتشار 2010