Magneto-tunable photocurrent in manganite-based heterojunctions

Abstract

Correlated electron oxide heterojunctions and their photovoltaic effect have attracted increasing attention from the viewpoints of both possible application to novel devices and basic science. In such junctions, correlated electron physics has to be taken into account in addition to conventional semiconductor modelling to explain distinctively emerging features. However, extracting novel functionalities has not been easy because it is not possible to predict their interfacial properties solely from their bulk characteristics. Here we describe a magneto-tunable photocurrent in a pn junction based on a correlated electron oxide La 0.7 Sr 0.3 MnO 3 combined with a semiconducting SrTiO 3 substrate. On applying an epitaxial strain, the photocurrent is enhanced threefold, which is increased 30% further by a magnetic field. Such a magneto-tunable effect is possible for only a narrow window of the correlated gap, which is itself adjusted by bandwidth and temperature. These results provide a guideline for utilization of correlated phenomena into the novel electronic devices.

Low field magneto-tunable photocurrent in CoFe2O4 nanostructure films for enhanced photoelectrochemical properties

“…S3, Supplementary Information). The observed magnetic field induced change in the photocurrent corresponds to ~123% enhancement in the photocurrent which is significantly higher compared to earlier published works on the magnetic field effect on the photocurrents 5,6 as well as other effects on the photocurrents (Table S1, Supplementary Information). Figure 2c shows the chronoamperometry results of CoFe 2 O 4 nanostructure films at a fixed potential of 1.23 V (vs. RHE) in the presence of magnetic fields of different strength.…”

“…Recently, Sheng et al . 5 demonstrated ~30% enhancement in the photocurrent using a correlated electron oxide La 0.7 Sr 0.3 MnO 3 system under an external magnetic field of ~6 T. For such system, magnetic field dependence of the correlated gap is suggested for the change in the photocurrents. Pan et al .…”

Real-time decay of a highly excited charge carrier in the one-dimensional Holstein model

“…The physical motivation for choosing the state in Eq. (2) is to model the dynamics of a free-electron wave-packet [32,33,35] emerging after a sudden external perturbation of a many-body system. Preventing density fluctuations (i.e., by using the fully delocalized initial state with a sharp momentum) simplifies the analysis in the stationary regime, discussed in Sec.…”

Particle size dependence on the structural, transport and optical properties of charge-ordered Pr0.6Ca0.4MnO3

“…Hall-Magnetoresistive devices and many more [12][13][14][15][16][17][18][19][20]. Doped perovskite manganites exhibit strong dependence of their properties on the particle size of the systems, especially on the charge ordered state.…”