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… 

Figures and Tables from this paper

References

SHOWING 1-10 OF 40 REFERENCES

nextnano: General Purpose 3-D Simulations

nextnano is a semiconductor nanodevice simulation tool that has been developed for predicting and understanding a wide range of electronic and optical properties of semiconductor nanostructures. The

Quasicondensation of Bilayer Excitons in a Periodic Potential.

In the regime of a deep lattice potential where excitons are strongly localized at the lattice sites, it is shown that an array of phase-independent quasicondensates, different from a Mott insulator, is realized.

Evidence of high-temperature exciton condensation in two-dimensional atomic double layers

This study provides evidence for interlayer exciton condensation in two-dimensional atomic double layers and opens up opportunities for exploring condensate-based optoelectronics and exciton-mediated high-temperature superconductivity.

Intrawell and interwell intersubband transitions in multiple quantum wells for far‐infrared sources

A theoretical study of electrically pumped unipolar lasers exploiting intrawell or interwell intersubband radiative transitions in multiple quantum‐well heterostructures for the generation of IR and

Role of the X minimum in transport through AlAs single-barrier structures

We report an electrical transport and electroluminescence (EL) spectroscopy study of single-barrier GaAs-AlAs-GaAs $p\ensuremath{-}i\ensuremath{-}n$ tunnel structures with a barrier thickness in the

Feasibility of superfluidity of paired spatially separated electrons and holes; a new superconductivity mechanism

Systems with dielectric pairing of spatially separated electrons and holes are considered. Superfluid motion of the charges, corresponding to undamped electric currents, is possible in such systems.

Theory of superconductivity of systems with pairing of spatially separated electrons and holes

The possibility of superconductivity is predicted in systems with pairing of spatially separated electrons and holes. Gor'kov and Ginzburg-Landau equations are obtained for the systems under

Closely spaced and separately contacted two-dimensional electron and hole gases by in situ focused-ion implantation

Separately contacted layers of a two-dimensional (2D) electron gas and a 2D hole gas have been prepared in GaAs, which are separated by AlGaAs barriers down to 15 nm thickness. The

Strongly Enhanced Tunneling at Total Charge Neutrality in Double-Bilayer Graphene-WSe_{2} Heterostructures.

The experimental observation of strongly enhanced tunneling between graphene bil layers through a WSe_{2} barrier when the graphene bilayers are populated with carriers of opposite polarity and equal density suggests the emergence of a many-body state with condensed interbilayer excitons when electrons and holes of equal densities populate the two layers.