Capacitance and conductance oscillations from electron tunneling into high energy levels of a quantum well in a p−i−n diode

@article{Parolo2022CapacitanceAC,
  title={Capacitance and conductance oscillations from electron tunneling into high energy levels of a quantum well in a 
p−i−n
 diode},
  author={Silvia Parolo and M. Lupatini and E K{\"u}lah and Christian Reichl and Werner Dietsche and Werner Wegscheider},
  journal={Physical Review B},
  year={2022}
}
Two-dimensional electron and hole gases separated by a few nm from each other are produced in p-i-n diodes based upon MBE-grown GaAs/AlGaAs heterostructures. At such interlayer distances, the exciton formation and possibly Bose-Einstein condensation (BEC) is expected. We measure the capacitance between the layers and find it to oscillate as a function of the bias voltage. The peak values exceed the geometric capacitance by up to a factor of two. The surprisingly regular periods of the… 

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