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Your search keyword '"I. Maggio Aprile"' showing total 2 results
Start Over Author "I. Maggio Aprile" Topic condensed matter::materials science
2 results on '"I. Maggio Aprile"'

1. Photodoping and in-gap interface states across the metal-insulator transition in LaAlO3/SrTiO3 heterostructures

Author

Z. Ristic, F. Chiarella, DE LUCA, GABRIELLA MARIA, I. Maggio Aprile, M. Radovic, M. Salluzzo, DI CAPUA, ROBERTO, Z., Ristic, DI CAPUA, Roberto, F., Chiarella, DE LUCA, GABRIELLA MARIA, I., Maggio Aprile, M., Radovic, and M., Salluzzo

Subjects
Condensed Matter::Quantum Gases, Modulation, Condensed Matter::Materials Science, Superconductivity, STO, LAO, photodoping, interface states, insulating to metal transition, scanning tunneling microscopy, Srtio3, Condensed Matter::Strongly Correlated Electrons, Oxides, Coexistence
Abstract

By using scanning tunneling microscopy/spectroscopy we show that the interface between LaAlO3 and SrTiO3 band insulators is characterized by in-gap interface states. These features were observed in insulating as well as conducting LaAlO3/SrTiO3 bilayers. The data show how the interface density of states evolves across the insulating to metal transition, demonstrating that nanoscale electronic inhomogeneities in the system are induced by spatially localized electrons.

2. Observation of a two-dimensional electron gas at the surface of annealed SrTiO3 single crystals by scanning tunneling spectroscopy

Author

DI CAPUA, ROBERTO, SCOTTI DI UCCIO, UMBERTO, VAGLIO, RUGGERO, M. Radovic, DE LUCA, GABRIELLA MARIA, I. Maggio Aprile, F. Miletto Granozio, N. C. Plumb, Z. Ristic, M. Salluzzo, DI CAPUA, Roberto, M., Radovic, DE LUCA, GABRIELLA MARIA, I., Maggio Aprile, F., Miletto Granozio, N. C., Plumb, Z., Ristic, SCOTTI DI UCCIO, Umberto, Vaglio, Ruggero, and M., Salluzzo

Subjects
Condensed Matter - Other Condensed Matter, Condensed Matter - Materials Science, Condensed Matter::Materials Science, Condensed Matter::Superconductivity, STO, two dimensional electron gas, scanning tunneling spectroscopy, annealing, surface reconstruction, Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences, Other Condensed Matter (cond-mat.other)
Abstract

Scanning tunneling spectroscopy suggests the formation of a two dimensional electron gas (2DEG) on the TiO2 terminated surface of undoped SrTiO3 single crystals annealed at temperature lower than 400 {\deg}C in ultra high vacuum conditions. Low energy electron diffraction indicates that the 2D metallic SrTiO3 surface is not structurally reconstructed, suggesting that non-ordered oxygen vacancies created in the annealing process introduce carriers leading to an electronic reconstruction. The experimental results are interpreted in a frame of competition between oxygen diffusion from the bulk to the surface and oxygen loss from the surface itself., Comment: 9 pages, 3 figures, submitted to Physical Review B

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