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Optically excited multi-band conduction in LaAlO3/SrTiO3 heterostructures
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10.1063/1.4790844
/content/aip/journal/apl/102/5/10.1063/1.4790844
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/5/10.1063/1.4790844
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Sample resistance as a function of time during the illumination with photons of energy from 1.44 to 3.65 eV at 4.2 K. Each change in the photon energy results in a pronounced step in the sample resistance; the photon energies, in eV, are shown beside each of the steps. Note the break on the time-axis showing the persistence of the resistance change. The inset shows a schematic band diagram (CB––conduction band, VB––valence band, and EF ––Fermi-level) for a LAO/STO heterostructure under illumination and presuming an internal potential build up in the LAO.

Image of FIG. 2.
FIG. 2.

Total number of photons at the sample as a function of photon energy is shown in open circles (right axis). Normalized sample resistance as a function of the energy of illuminating photons is shown in solid circles (left axis). The connecting lines are a guide to the eye.

Image of FIG. 3.
FIG. 3.

(a) Hall resistance data as a function of the applied magnetic field, for illumination with different values of Ntot with energy of 3.65 eV at 4.2 K (open symbols). Solid lines: The two-band model fits to the experimental data. (b) (longitudinal) Magnetoresistance data as a function of the applied magnetic field and (c) carrier concentration of the second, high mobility band for illumination with different values of Ntot .

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/content/aip/journal/apl/102/5/10.1063/1.4790844
2013-02-05
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Optically excited multi-band conduction in LaAlO3/SrTiO3 heterostructures
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/5/10.1063/1.4790844
10.1063/1.4790844
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