Origin and distribution of charge carriers in LaAlO3-SrTiO3 oxide heterostructures in the high carrier density limit

Mukherjee, SumantaIndian Inst Sci, Solid State & Struct Chem Unit, Bengaluru 560012, Karnataka, India. (författare)

Using hard x-ray photoelectron spectroscopywith variable photon energy (2-8 keV), we address the distribution of charge carriers in the prototypical LaAlO3 (LAO) and SrTiO3 (STO) oxide heterostructures with high carrier densities (10(17) cm(-2)). Our results demonstrate the presence of two distinct charge distributions in this system: one tied to the interface with a similar to 1-nm width and similar to 2-5 x 10(14)-cm(-2) carrier concentration, while the other appears distributed nearly homogeneously through the bulk of STO corresponding to a much larger carrier contribution. Our results also establish bimodal oxygen vacancies, namely on top of LAO and throughout STO, quantitatively establishing these as the origin of the observed bimodal depth distribution of charge carriers in these highly doped sample.

Pal, BanabirIndian Inst Sci, Solid State & Struct Chem Unit, Bengaluru 560012, Karnataka, India. (författare)
Choudhury, DebrajIndian Inst Sci, Solid State & Struct Chem Unit, Bengaluru 560012, Karnataka, India.;Indian Inst Technol, Dept Phys, Kharagpur 721302, W Bengal, India. (författare)
Sarkar, IndranilDeutsch Elektronen Synchrotron DESY, Notkestr 85, D-22607 Hamburg, Germany. (författare)
Drube, WolfgangDeutsch Elektronen Synchrotron DESY, Notkestr 85, D-22607 Hamburg, Germany. (författare)
Gorgoi, MihaelaHelmholtz Zentrum Berlin Mat & Energie GmbH, Albert Einstein Str 15, D-12489 Berlin, Germany. (författare)
Karis, OlofUppsala universitet,Molekyl- och kondenserade materiens fysik(Swepub:uu)olofkari (författare)
Takagi, H.Univ Tokyo, Dept Phys, Tokyo 1130033, Japan.;Max Plank Inst Solid State Res, D-70569 Stuttgart, Germany. (författare)
Matsuno, JobuRIKEN, CEMS, 2-1 Hirosawa, Wako, Saitama 3510198, Japan. (författare)
Sarma, D. D.Indian Inst Sci, Solid State & Struct Chem Unit, Bengaluru 560012, Karnataka, India.;Dept Phys & Astron, Box 516, S-75120 Uppsala, Sweden.;CSIR, NISE, New Delhi 110001, India.;Jawaharlal Nehru Ctr Adv Sci Res, Bengaluru 560064, India. (författare)
Indian Inst Sci, Solid State & Struct Chem Unit, Bengaluru 560012, Karnataka, India.Indian Inst Sci, Solid State & Struct Chem Unit, Bengaluru 560012, Karnataka, India.;Indian Inst Technol, Dept Phys, Kharagpur 721302, W Bengal, India. (creator_code:org_t)

Av författaren/redakt...: Mukherjee, Suman ...; Pal, Banabir; Choudhury, Debra ...; Sarkar, Indranil; Drube, Wolfgang; Gorgoi, Mihaela; visa fler...; Karis, Olof; Takagi, H.; Matsuno, Jobu; Sarma, D. D.; visa färre...

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