Optical probe of electrostatic-doping in an<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>n</mml:mi></mml:math>-type Mott insulator

Nakamura, Masao; Sawa, Akihito; Sato, Hiroshi; Akoh, H.; Kawasaki, Masashi; Tokura, Y.

doi:10.1103/physrevb.75.155103

Cited by 24 publications

(20 citation statements)

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“…It was found in some cases that the interfacial band profiles in such heterointerfaces can be well understood within the framework of a rigid-band scenario, and that the electron correlations play a minor role in determining the properties of these heterointerfaces 17 . In contrast, the electron correlation effect becomes dominant when the interfacial carrier density was modulated by external fields 18 . In this context, an investigation into the subtle balance and harmonization of the two physical scenarios is very important.…”

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confidence: 98%

Magneto-tunable photocurrent in manganite-based heterojunctions

et al. 2014

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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.

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confidence: 98%

Magneto-tunable photocurrent in manganite-based heterojunctions

et al. 2014

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“…[1][2][3][4] The realization of this kind of devices is a route to change carrier concentration at the interface without the structural distortions and/or chemical disorder characteristic of doping by element substitution. 5 From the applied point of view, devices made of these materials are promising due to the fact that interface properties can be modified by external stimuli, giving rise to a wide variety of phenomena such as magnetoresistance, 6 magnetocapacitance, 7 electroresistance, 8 photocarrier control of ferromagnetism, 9 etc. In this context, the study of the electronic properties of the interface is relevant 10,11 in elucidating the mechanisms governing the aforementioned phenomena.…”

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confidence: 99%

Effects of interface states on the transport properties of all-oxide La0.8Sr0.2CoO3∕SrTi0.99Nb0.01O3 p-n heterojunctions

Bruno

García‐Barriocanal

Torija

et al. 2008

Applied Physics Letters

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Electrical transport properties of heteroepitaxial p-n junctions made of La0.8Sr0.2CoO3 and SrTi0.99Nb0.01O3 were studied. Junctions display highly rectifying current-voltage characteristics over a wide temperature range (20–300K). Two distinct transport mechanisms are identified: tunneling assisted by interface states at T<130K and diffusion/recombination at higher temperatures. Capacitance-voltage characteristics are used to determine the junction built-in potential at different frequencies. A capacitance relaxation is found due to charge trapping at interface states. Interface states, which deeply affect transport, are discussed in connection to charge-transfer processes related to the polarity mismatch at the interface.

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“…Although the studies are carried out on this specific system, we note that electrostatic doping of correlated materials is a subject of great current interest (see, e.g., Refs. [12][13][14][15][16]). In this context, the GdTiO 3 =SrTiO 3 system is an almost ideal model system, due to its relative chemical, electronic and structural simplicity, such as no pre-existing (bulk) structural distortions or electron correlations in the SrTiO 3 .…”

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confidence: 99%