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2-Dimensional electron gases at oxide interfaces: reversible non-volatile switch under field effect and light

Categoria
Seminario
Data
10 Maggio 2017 15:00 - 16:00
Luogo
14 - 15 IV piano St. 9
Affiliation
CNR-SPIN, Napoli
Area di Ricerca
Superconduttivita', Sistemi fortemente correlati, Eterostrutture e loro applicazioni

2-Dimensional electron gases (2DEGs) at oxide interfaces hold promise to combine the specific physics of low-dimensional systems with extraordinary functional properties as superconductivity, magnetism and ferroelectricity, that are commonly found in transition metal oxides, and are typically missing in semiconductors. In this talk, the phenomenology of oxide 2DEGs will be first revised, and several variants of the original LaAlO3/SrTiO3 interface will be presented, also in view of the results obtained in Naples. It will then be shown that an appropriate procedure based on single-gate-voltage pulses, applied below 100K, can bring some type of oxide 2DEGs samples to an insulating state. This state can be destroyed by a relatively modest dose of visible-range photons, which cause a sudden collapse of the system back to the metallic ground state, with a resistivity decrease exceeding four orders of magnitude. The system is repeatedly switchable between the ON and OFF states by the alternate application of voltage and light pulses. A model describing our findings in terms of a controlled electron transfer between mobile and localized interfacial states is proposed. The analogy with memristive devices is discussed.

 
 

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