A capacitance spectroscopy-based platform for realizing gate-defined electronic lattices

A capacitance spectroscopy-based platform for realizing gate-defined electronic lattices

Hensgens, T. (TU Delft QCD/Vandersypen Lab)
Mukhopadhyay, U. (TU Delft QCD/Vandersypen Lab)
Barthelemy, P.J.C. (TU Delft QN/Quantum Transport)
Vermeulen, R.F.L. (TU Delft ALG/General)
Schouten, R.N. (TU Delft ALG/General)
Fallahi, S. (Purdue University)
Gardner, G. C. (Purdue University)
Reichl, C. (ETH Zürich)
Wegscheider, W. (ETH Zürich)
Manfra, M. J. (Purdue University)
Vandersypen, L.M.K. (TU Delft QCD/Vandersypen Lab; TU Delft QN/Vandersypen Lab)

2018

Electrostatic confinement in semiconductors provides a flexible platform for the emulation of interacting electrons in a two-dimensional lattice, including in the presence of gauge fields. This combination offers the potential to realize a wide host of quantum phases. Capacitance spectroscopy provides a technique that allows one to directly probe the density of states of such two-dimensional electron systems. Here, we present a measurement and fabrication scheme that builds on capacitance spectroscopy and allows for the independent control of density and periodic potential strength imposed on a two-dimensional electron gas. We characterize disorder levels and (in)homogeneity and develop and optimize different gating strategies at length scales where interactions are expected to be strong. A continuation of these ideas might see to fruition the emulation of interaction-driven Mott transitions or Hofstadter butterfly physics.

http://resolver.tudelft.nl/uuid:5fe3aeca-6bc8-4530-a120-4dfe182197f4

https://doi.org/10.1063/1.5046796

2019-09-27

0021-8979

Journal of Applied Physics, 124 (12)

Institutional Repository

journal article

© 2018 T. Hensgens, U. Mukhopadhyay, P.J.C. Barthelemy, R.F.L. Vermeulen, R.N. Schouten, S. Fallahi, G. C. Gardner, C. Reichl, W. Wegscheider, M. J. Manfra, L.M.K. Vandersypen