Large negative electronic compressibility of LaAlO3-SrTiO3 interfaces with ultrathin LaAlO3 layers

Article

关键词: 2-DIMENSIONAL ELECTRON;    FORCE MICROSCOPY;    GAS;    SUPERCONDUCTIVITY;    HETEROSTRUCTURES;    COEXISTENCE;    CAPACITANCE;    FIELD;   

DOI  :  10.1103/PhysRevB.86.075116

来源: SCIE

【 摘 要 】

A two-dimensional electron liquid is formed at the n-type interface between SrTiO3 and LaAlO3. Here we report on Kelvin probe microscopy measurements of the electronic compressibility of this electron system. The electronic compressibility is found to be negative for carrier densities of approximate to 10(13)/cm(2). At even smaller densities, a metal-to-insulator transition occurs. These local measurements corroborate earlier measurements of the electronic compressibility of LaAlO3-SrTiO3 interfaces obtained by measuring the capacitance of macroscopic metal-LaAlO3-SrTiO3 capacitors.

【 授权许可】

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