MESA+ University of Twente
Quantum Transport in Matter

Oxide interface quantum devices

We have performed high field magneto transport measurements to investigate the interface electron gas in a high mobility SrTiO3/SrCuO2/LaAlO3/SrTiO3 heterostructure. Shubnikov-de Haas oscillations reveal several 2D conduction subbands with carrier effective masses of 0.9me and 2me, quantum mobilities of order 2000 cm2/V s, and band edges only a few milli-electronvolts below the Fermi energy. Measurements in tilted magnetic fields confirm the 2D character of the electron gas, and show evidence of inter-subband scattering. [abstract from: APL MATERIALS 2, 022102 (2014)].

These gate-tunable high mobility oxide interfaces are now used to combine superconductivity, Rashba spin-orbit coupling and reduced dimensionality.

Recent publications

Quantum oscillations and subband properties of the two-dimensional electron gas at the LaAlO3/SrTiO3 interface

A. McCollam, S. Wenderich, M.K. Kruize, V.K. Guduru, H.J.A. Molegraaf, M. Huijben, G. Koster, D.H.A. Blank, G. Rijnders, A. Brinkman, H. Hilgenkamp, U. Zeitler, and J. C. Maan

Appl. Phys. Lett. Mater. 2, 022102 (2014).

Thermally excited multi-band conduction in LaAlO3/SrTiO3 heterostructures exhibiting magnetic scattering

V.K. Guduru, A. McCollam, A. Jost, S. Wenderich, H. Hilgenkamp, J.C. Maan, A. Brinkman, U. Zeitler

Phys. Rev. B 88, 241301 (2013).

Defect engineering in oxide heterostructures by enhanced oxygen surface exchange.

M. Huijben, G. Koster, M.K. Kruize, S. Wenderich, J. Verbeeck, S. Bals, E. Slooten, B. Shi, H.J.A. Molegraaf, J.E. Kleibeuker, S. Van Aert, J.B. Goedkoop, A. Brinkman, D.H.A. Blank, M.S. Golden, G. Van Tendeloo, H. Hilgenkamp, G. Rijnders

Adv. Funct. Mat. 23, 5240 (2013).

People

Sander Smink
MSc graduation assignment in QTM/ICE

https://www.utwente.nl/tnw/ice/people/Smink/
Dr. Martin Stehno
Postdoc in QTM/ICE

https://www.utwente.nl/tnw/ice/people/Stehno/