Abstract
We observed an anomalous linear photogalvanic effect (ALPGE) in undoped InGaAs/AlGaAs multiple quantum well and studied its wavelength dependence in details. This effect is believed to originate from the optical momentum alignment effect and the inhomogeneity of light intensity. We find that the spot location with the maximum ALPGE current is wavelength independent. And the normalized ALPGE current decreasing at smaller wavelengths is attributed to the sharp decrease of the momentum and energy relaxation time. The electrical measurement of the spectra dependence of ALPGE is highly sensitive proving to be an effective method for detecting the momentum anisotropy of photoinduced carriers and band coupling.
Highlights
Photocurrents induced by linearly polarized light in semiconductors have been intensively studied for decades [1,2,3,4,5,6,7]
We report the observation of anomalous linear photogalvanic effect (ALPGE) and its spectra dependence in an undoped (001)-oriented InGaAs/AlGaAs multiple quantum well (MQW) with C2v symmetry, which is a good supplement to the in-depth investigation of the spectra dependence of momentum anisotropy of the photoinduced carriers in semiconductors
In the experiment, the ALPGE currents are measured as a function of the spot location at different wavelengths (near the transitions of 1hh-1e (955 nm) and 1lh-1e (905 nm))
Summary
Photocurrents induced by linearly polarized light in semiconductors have been intensively studied for decades [1,2,3,4,5,6,7]. Polarized light can result in the linear photogalvanic effect (LPGE) [1], the photon drag effect [1], the pure spin current in a system with spin orbit interaction [2,3], and the optical momentum alignment effect [4,5,6] (Figure 1). An anomalous linear photogalvanic effect (ALPGE) was firstly observed in a (001)-oriented GaN-based two-dimensional electron gas (2DEG) [7]. The ALPGE occurs in (001)-oriented 2DEG with C2v symmetry for normal light incidence [7], while the ordinary LPGE is forbidden by symmetry in this situation [1] (but it is not always true for other situations, such as (110)-oriented quantum wells [8]).
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