MESA+ University of Twente
Interfaces and correlated electrons

Electron-hole interactions in correlated electron systems

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A fundamental difference exists between individual charge carries. i.e. the negative electrons (e) or positively charged holes (h), and pairs of these charges such as Cooperpairs (2e of 2h) and excitons (e+h). The pairing of the fermionic individual charges into bosonic pairs makes it possible to form collective states like superconductivity and related manifestations of Bose-Einstein condensation. We investigate the nature of electron-hole interactions in materials that are known to exhibit strong correlations, in particular transition metal oxides. In this, we are especially interested in exciton Bose-Einstein condensation and in the potential use of exciton states for the creation of high(er) temperature superconductivity.

Selected recent & key publications:

L. Rademaker, K. Wu, H. Hilgenkamp and J. Zaanen,

‘The dynamical frustration of interlayer excitons delocalizing in bilayer quantum antiferromagnets’

Europhysics Letters 97, 27004 (2012).

M. Huijben, D. Kockmann, J. Huijben, J.E. Kleibeuker, A. van Houselt, G. Koster, D.H.A. Blank, H. Hilgenkamp, G. Rijnders, A. Brinkman and H.J.W. Zandvliet,

‘Local probing of coupled interfaces between two-dimensional electron and hole gases in oxide heterostructures by variable-temperature scanning tunneling spectroscopy’,

Phys. Rev. B 86, 035140 (2012).

L. Rademaker, J. Zaanen and H. Hilgenkamp,

‘Prediction of quantization of magnetic flux in double-layer exciton superfluids’,

Physical Review B 83, 012504 (2011).

A. Brinkman, H. Hilgenkamp,

‘Electron-hole coupling in high-Tc cuprate superconductors’,

Physica C 422, 71-75 (2005).

More publications see: List of publications