124 citations · 781 across the 35 of their papers we have counts for
31 papers · 1 filter
Strongly interacting 2D electron systems: Evidence for enhanced 1D edge-channel coupling
C. Marty, C. Reichl, S. Parolo +4
We observe nearly vanishing Hall resistances for integer filling factors in a counterflow (CF) experiment on a density balanced 2D bilayer system. Filling factor dependent equilibr…
Josephson-like tunnel resonance and large Coulomb drag in GaAs-based electron-hole bilayers
M. L. Davis, S. Parolo, C. Reichl +2
Bilayers consisting of two-dimensional (2D) electron and hole gases separated by a 10 nm thick AlGaAs barrier are formed by charge accumulation in epitaxially grown GaAs. Both vert…
Controlled generation and detection of a thermal bias in Corbino devices under the quantum Hall regime
Mariano A. Real, Alejandra Tonina, Liliana Arrachea +4
We present an experimental technique to generate and measure a temperature bias in the quantum Hall effect of GaAs/AlGaAs Corbino samples. The bias is generated by injecting an ele…
Capacitance and conductance oscillations from electron tunneling into high energy levels of a quantum well in a p-i-n diode
S. Parolo, M. Lupatini, E. Külah +3
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 dis…
Thermoelectric cooling properties of a quantum Hall Corbino device
Juan Herrera Mateos, Mariano A. Real, Christian Reichl +4
We analyze the thermoelectric cooling properties of a Corbino device in the quantum Hall regime on the basis of experimental data of electrical conductance. We focus on the cooling…
Thermoelectricity in Quantum-Hall Corbino Structures
Mariano Real, Daniel Gresta, Christian Reichl +6
We measure the thermoelectric response of Corbino structures in the quantum Hall effect regime and compare it with a theoretical analysis. The measured thermoelectric voltages are…
A novel planar back-gate design to control the carrier concentrations in GaAs-based double quantum wells
J. Scharnetzky, J. M. Meyer, M. Berl +4
The precise control of a bilayer system consisting of two adjacent two-dimensional electron gases (2DEG) is demonstrated by using a novel planar back-gate approach based on ion imp…
Achieving Balance of Valley Occupancy in Narrow AlAs Quantum Wells
A. R. Khisameeva, A. V. Shchepetilnikov, V. M. Muravev +7
Terahertz photoconductivity of m and m Hall bars fabricated from narrow AlAs quantum wells (QWs) of different widths is investigated in this paper. The photoresponse i…
Direct observation of energy spectrum transition in narrow AlAs quantum wells
A. R. Khisameeva, A. V. Shchepetilnikov, V. M. Muravev +8
Spectra of magnetoplasma excitations have been investigated in a two-dimensional electron systems in AlAs quantum wells (QWs) of different widths. The magnetoplasma spectrum have b…
Stable Branched Electron Flow
B A Braem, C Gold, S Hennel +6
The pattern of branched electron flow revealed by scanning gate microscopy shows the distribution of ballistic electron trajectories. The details of the pattern are determined by t…
Scanning Gate Microscopy in a Viscous Electron Fluid
Beat A Braem, Francesco M D Pellegrino, Alessandro Principi +10
We measure transport through a Ga[Al]As heterostructure at temperatures between 0.1 K and 30 K. Increasing the temperature enhances the electron-electron scattering rate and viscou…
Nuclear magnetic resonance and nuclear spin relaxation in AlAs quantum well probed by ESR
A. V. Shchepetilnikov, D. D. Frolov, Yu. A. Nefyodov +6
The study of nuclear magnetic resonance and nuclear spin-lattice relaxation was conducted in an asymmetrically doped to cm 16 nm AlAs quantum well gr…
Improvement of the transport properties of a high-mobility electron system by intentional parallel conductance
Sebastian Peters, Lars Tiemann, Christian Reichl +3
We present a gating scheme to separate even strong parallel conductance from the magneto-transport signatures and properties of a two-dimensional electron system. By varying the el…
Photoluminescence and the gallium problem for highest-mobility GaAs/AlGaAs-based 2d electron gases
F. Schläpfer, W. Dietsche, C. Reichl +2
The quest for extremely high mobilities of 2d electron gases in MBE-grown heterostructures is hampered by the available purity of the starting materials, particularly of the galliu…
Structured Back Gates for High-Mobility Two-Dimensional Electron Systems Using Oxygen Ion Implantation
Matthias Berl, Lars Tiemann, Werner Dietsche +2
We present a new approach of back gate patterning that is compatible with the requirements of highest mobility molecular beam epitaxy. Contrary to common back gating techniques, ou…
Magnetoplasma excitations of two-dimensional anisotropic heavy fermions in AlAs quantum wells
V. M. Muravev, A. R. Khisameeva, V. N. Belyanin +5
The spectra of plasma and magnetoplasma excitations in a two-dimensional system of anisotropic heavy fermions were investigated for the first time. The spectrum of microwave absorp…
Acoustic Measurements of the Stripe and the Bubble Quantum Hall Phases
M. E. Msall, W. Dietsche
We launch surface acoustic waves (SAW) along both the and the directions of a Hall bar and measure the anisotropic conductivity in a high purity GaAs 2-D elec…
Detection of 2D electron g-factor sign inversion in narrow GaAs/AlGaAs quantum wells
V. V. Solovyev, W. Dietsche, I. V. Kukushkin
By means of CW polarization-resolved photoluminescence spectroscopy we demonstrate the sign inversion of -component of 2D electron g-factor with narrowing of a hosting GaAs/Al…
Interplay between the coherent and incoherent transport in quantum Hall bilayers
Ding Zhang, Xuting Huang, Werner Dietsche +2
We systematically study the coherent transport (Josephson tunneling and counterflow current) and its breakdown which leads to incoherent charge flow in in the excitonic BCS condens…
Increasing the ν = 5 / 2 gap energy: an analysis of MBE growth parameters
Christian Reichl, Jun Chen, Stephan Baer +5
The fractional quantized Hall state (FQHS) at the filling factor ν = 5/2 is of special interest due to its possible application for quantum computing. Here we report on the optimiz…
Anomalous resistance overshoot in the integer quantum Hall effect
E. M. Kendirlik, S. Sirt, S. B. Kalkan +4
In this work we report experiments on defined by shallow etching narrow Hall bars. The magneto-transport properties of intermediate mobility two-dimensional electron systems are in…
Coupling of Josephson Currents in Quantum Hall Bilayers
X. Huang, W. Dietsche, M. Hauser +1
We study ring shaped (Corbino) devices made of bilayer two-dimensional electron gases in the total filling factor one quantized Hall phase which is considered to be a coherent BCS-…
Extra Spin-Wave mode in Quantum Hall systems. Beyond the Skyrmion Limit
I. K. Drozdov, L. V. Kulik, A. S. Zhuravlev +4
We report on the observation of a new spin mode in a quantum Hall system in the vicinity of odd electron filling factors under experimental conditions excluding the possibility of…
Cyclotron spin-flip excitations in a ν=1/3 quantum Hall ferromagnet
A. B. Van'kov, L. V. Kulik, S. M. Dickmann +4
Inelastic light scattering spectroscopy around the ν=1/3 filling discloses a novel type of cyclotron spin-flip excitation in a quantum Hall system in addition to the excitations pr…