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Christian Schönenberger  - - - 
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Christian Schönenberger

108 shared publications

Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland.

Péter Makk

35 shared publications

Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland

M. Jung

25 shared publications

Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland.and DGIST Research Institute, DGIST, Daegu 42988, Korea

László Forró

4 shared publications

Department of Physics, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland

107
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Publication Record
Distribution of Articles published per year 
(1991 - 2019)
Total number of journals
published in
 
31
 
Publications See all
Article 0 Reads 0 Citations GHz nanomechanical resonator in an ultraclean suspended graphene p-n junction. MinKyung Jung, Peter Rickhaus, Simon Zihlmann, Alexander Eic... Published: 07 March 2019
Nanoscale, doi: 10.1039/c8nr09963d
DOI See at publisher website PubMed View at PubMed ABS Show/hide abstract
We demonstrate high-frequency mechanical resonators in ballistic graphene p-n junctions. Fully suspended graphene devices with two bottom gates exhibit ballistic bipolar behavior after current annealing. We determine the graphene mass density and built-in tension for different current annealing steps by comparing the measured mechanical resonant response to a simplified membrane model. In a graphene membrane with high built-in tension, but still of macroscopic size with dimensions 3 × 1 μm2, a record resonance frequency of 1.17 GHz is observed after the final current annealing step. We further compare the resonance response measured in the unipolar with the one in the bipolar regime. Remarkably, the resonant signals are strongly enhanced in the bipolar regime.
Article 0 Reads 1 Citation New Generation of Moiré Superlattices in Doubly Aligned hBN/Graphene/hBN Heterostructures Lujun Wang, Simon Zihlmann, Ming-Hao Liu, Peter Makk, Kenji ... Published: 25 February 2019
Nano Letters, doi: 10.1021/acs.nanolett.8b05061
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The specific rotational alignment of two-dimensional lattices results in a moiré superlattice with a larger period than the original lattices and allows one to engineer the electronic band structure of such materials. So far, transport signatures of such superlattices have been reported for graphene/hBN and graphene/graphene systems. Here we report moiré superlattices in fully hBN encapsulated graphene with both the top and the bottom hBN aligned to the graphene. In the graphene, two different moiré superlattices form with the top and the bottom hBN, respectively. The overlay of the two superlattices can result in a third superlattice with a period larger than the maximum period (14 nm) in the graphene/hBN system, which we explain in a simple model. This new type of band structure engineering allows one to artificially create an even wider spectrum of electronic properties in two-dimensional materials.
Article 6 Reads 1 Citation Coexistence of classical snake states and Aharonov-Bohm oscillations along graphene p−n junctions Péter Makk, Clevin Handschin, Endre Tóvári, Kenji Watanabe, ... Published: 09 July 2018
Physical Review B, doi: 10.1103/physrevb.98.035413
DOI See at publisher website
Article 0 Reads 2 Citations Cooper-pair splitting in two parallel InAs nanowires Shoji Baba, Christian Jünger, Sadashige Matsuo, Andreas Baum... Published: 15 June 2018
New Journal of Physics, doi: 10.1088/1367-2630/aac74e
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We report on the fabrication and electrical characterization of an InAs double - nanowire (NW) device consisting of two closely placed parallel NWs coupled to a common superconducting electrode on one side and individual normal metal leads on the other. In this new type of device we detect Cooper-pair splitting (CPS) with a sizeable efficiency of correlated currents in both NWs. In contrast to earlier experiments, where CPS was realized in a single NW, demonstrating an intra-wire electron pairing mediated by the superconductor (SC), our experiment demonstrates an inter-wire interaction mediated by the common SC. The latter is the key for the realization of zero-magnetic field Majorana bound states, or Parafermions; in NWs and therefore constitutes a milestone towards topological superconductivity. In addition, we observe transport resonances that occur only in the superconducting state, which we tentatively attribute to Andreev Bound states and/or Yu-Shiba resonances that form in the proximitized section of one NW.
PREPRINT 0 Reads 0 Citations Co-existence of classical snake states and Aharanov-Bohm oscillations along graphene p-n junctions Peter Makk, Clevin Handschin, Endre Tovari, Kenji Watanabe, ... Published: 07 April 2018
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Snake states and Aharonov-Bohm interferences are examples of magnetoconductance oscillations that can be observed in a graphene p-n junction. Even though they have already been reported in suspended and encapsulated devices including different geometries, a direct comparison remains challenging as they were observed in separate measurements. Due to the similar experimental signatures of these effects a consistent assignment is difficult, leaving us with an incomplete picture. Here we present measurements on p-n junctions in encapsulated graphene revealing several sets of magnetoconductance oscillations allowing for their direct comparison. We analysed them with respect to their charge carrier density, magnetic field, temperature and bias dependence in order to assign them to either snake states or Aharonov-Bohm oscillations. Furthermore we were able to consistently assign the various Aharonov-Bohm interferences to the corresponding area which the edge states enclose. Surprisingly, we find that snake states and Aharonov-Bohm interferences can co-exist within a limited parameter range.
Article 0 Reads 3 Citations Giant Valley-Isospin Conductance Oscillations in Ballistic Graphene Clevin Handschin, Péter Makk, Peter Rickhaus, Romain Maurand... Published: 17 August 2017
Nano Letters, doi: 10.1021/acs.nanolett.7b01964
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