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A two-dimensional electron gas (2DEG) has been observed at the interfaces and surfaces of
various perovskite transition metal oxides, with notable examples being SrTiO 3 and KTaO 3 .
These 2DEGs have garnered significant attention due to their unique properties and potential
applications. In particular, the coexistence of intriguing phenomena, such as spin-orbit
interaction, magnetism, 2D superconductivity, and gate-tunable Fermi energy, gives these
2DEGs a multi-functional character holding promise for spintronics and quantum computing
applications.
To unravel the electronic structure of the SrTiO 3 - and KTaO 3 -2DEG experimentally, I investigated
the quantum oscillations in magnetoresistance in various related interfaces in the extreme
conditions of high magnetic fields (up to 60 Tesla) and low temperatures (down to 80 mK) [1-5].
The most exciting finding is that for both types of 2DEGs, the cyclotron mass and oscillation
frequency increase with the magnetic field, indicating the presence of non-trivial electronic
bands. In this seminar, I will present novel insights into the electronic bands of the 2DEG based
on perovskite oxides, achieved through a comprehensive analysis of quantum oscillations.
Additionally, I will outline my prospective research interests and articulate my plans for
developing essential capabilities, all aimed toward quantum materials and devices research in
high magnetic fields at IISER Kolkata.
References:
[1] K. Rubi et al., npj Quantum Materials 5, 1 (2020)
[2] K. Rubi et al., Physical Review Research 3, 033234 (2021).
[3] I. Leemarkers, K. Rubi et al., Journal of Physics: Condensed Matter 33, 465002 (2021).
[4] H. Yan, S. Zeng, K. Rubi et al., Advanced Materials Interfaces 9, 2201633 (2022).
[5] K. Rubi et al., arXiv:2307.04854 (2023). |