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Quantentransport Phänomene in Nanostrukturierten Devices

English title Quantum Transport Phenomena in Nanoscaled Devices
Applicant Schönenberger Christian
Number 146139
Funding scheme Project funding (Div. I-III)
Research institution Departement Physik Universität Basel
Institution of higher education University of Basel - BS
Main discipline Condensed Matter Physics
Start/End 01.04.2013 - 31.03.2015
Approved amount 595'859.00
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Keywords (10)

Spintronics; Semiconducting Nanowires; Carbon Nanotubes; Graphene; Physics in Reduced Dimensions; Charge and Spin Transport in Nanostructures; Electronic Properties of Nanostructures; Quantum Electronics; Nanoelectronics; Quantum Transport

Lay Summary (German)

Lead
Quantum-Transport Phenomena in Nanoscaled Devices
Lay summary
In dem vom Schweizerischen Nationalfonds geförderten Projekt untersuchen wir nanostrukturierte Materialien, welche zum Studium von neuartigen Quantenzuständen und deren Nutzbarkeit für die Elektronik und Kommunikation dienen. Bei den Ausgangsmaterialien konzentrieren wir uns auf halbleitende Nanodrähte, Kohlenstoff-Nanoröhren und Graphene. In diese Materialien werden korrelierte Elektronen injiziert, welche als Paare einem Supraleiter entnommen werden. Unser Ziel ist es, die Elektronen jedes Paares gezielt im Raum zu trennen ohne dass dabei die quantenmechanische Korrelation, die sogenannte Verschränkung, verloren geht.
Direct link to Lay Summary Last update: 02.04.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
Scalable tight-binding model for graphene
Liu Min-Hao, Makk Peter, Tovari Endre, Maurand Romain, Tkatschenko F., Weiss Markus, Schönenberger Christian, Richter Klaus (2015), Scalable tight-binding model for graphene, in Phys. Rev. Lett., 114, 036601.
Snake trajectories in ultraclean graphene p-n junctions
Rickhaus Peter, Liu MIng-Hao, Tovari Endre, Weiss Markus, Maurand Romain, Richter Klaus, Schönenberger Christian (2015), Snake trajectories in ultraclean graphene p-n junctions, in Nature Communication, 6, 6470.
Carbon nanotube quantum dots on hexagonal boron nitride
Baumgartner Andreas, Abulizi Gülbostian, Taniguchi T, Gramich Jörg, Schönenberger Christian (2014), Carbon nanotube quantum dots on hexagonal boron nitride, in Appl. Phys. Lett., 105, 023111.
Electrolyte gate dependent high-frequency measurement of graphene field-effect transistor for sensing applications
Fu Wangyang, El Abbassi maria, Hasler Thomas, Jung Minkyung, Steinacher Michael, Calame Michel, Schönenberger Christian, Puebla-Hellmann Gabriel, Hellmüller sara, Wallraff Andreas (2014), Electrolyte gate dependent high-frequency measurement of graphene field-effect transistor for sensing applications, in Appl. Phys. Lett., 104, 013102.
Entanglement witnessing and quantum cryptography with nonideal ferromagnetic detectors
Kobus W., Grudka A, Baumgartner Andreas, Tomaszewski D, Schönenberger Christian, Martinek Jan (2014), Entanglement witnessing and quantum cryptography with nonideal ferromagnetic detectors, in Phys. Rev. B, 89, 125404.
Fabrication of ballistic suspended graphene with local gating
Maurand Romain, Rickhaus Peter, Makk Peter, Hess Samuel, Tovari Endre, Handschin Clevin, Weiss Markus, Schönenberger Christian (2014), Fabrication of ballistic suspended graphene with local gating, in Carbon, 79, 486.
Large-scale fabrication of BN tunnel barriers for graphene spintronics
Fu Wangyang, Makk Peter, Maurand Romain, Bräuninger Matthias (2014), Large-scale fabrication of BN tunnel barriers for graphene spintronics, in J. Appl. Phys., 116, 074306.
Local electrical tuning of the nonlocal signals in a Cooper-pair splitter
Fülöp Gergö, d'Hollosy Samuel, Baumgartner Andreas, Makk Peter, Guzenko V.A., Madsen M.H., Nygard J., Schönenberger Christian, Csonka Szabolcs (2014), Local electrical tuning of the nonlocal signals in a Cooper-pair splitter, in Phys. Rev. B, 90, 235412.
Nonlocal spectroscopy of Andeev bound states
Schindele Jens, Baumgartner Andreas, Maurand Romain, Weiss Markus, Schönenberger Christian (2014), Nonlocal spectroscopy of Andeev bound states, in Phys. Rev. B, 89, 045422.
Optimized fabrication and characterization of carbon nanotube spin valves
Samm Julia, Gramich Jörg, Baumgartner Andreas, Weiss Markus, Schönenberger Christian (2014), Optimized fabrication and characterization of carbon nanotube spin valves, in J. Appl. Phys., 115, 174309.
Ballistic interferences in suspended graphene
Rickhaus Peter, Maurand Romain, Weiss Markus, Liu Ming-Hao, Richter Klaus, Schönenberger Christian (2013), Ballistic interferences in suspended graphene, in Nature Communication, 4, 2342.
Low-bias active control of TeraHertz-waves by coupling large-area CVD-graphene to a TeraHertz-Metamaterial
Valmorra F., Scalari G., Maissen C., Fu Wangyang, Schönenberger Christian, Choi J. W., Park H.G., Gyu Hyung, Beck M., Faist Jerome (2013), Low-bias active control of TeraHertz-waves by coupling large-area CVD-graphene to a TeraHertz-Metamaterial, in Nano Letters, 13, 3193.
Ultraclean single, double and triple carbon nanotube quantum dots with Re recessed bottom gates
Jung Minkyung, Schindele Jens, Nau Stefan, Weiss Markus, Baumgartner Andreas, Schönenberger Christian (2013), Ultraclean single, double and triple carbon nanotube quantum dots with Re recessed bottom gates, in Nano Letters, 13, 4522.

Collaboration

Group / person Country
Types of collaboration
Niels Bohr Institute, University of Copenhagen Denmark (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Exchange of personnel
PSI Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
- Exchange of personnel
Budapest University of Technology and Economics Hungary (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
- Exchange of personnel
Geneva Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
ETHZ Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
- Exchange of personnel

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
NanoPeter 2014 Talk given at a conference Optics with ballistic electrons in suspended monolayer graphene, 21.06.2014 St. Petersburg, Russia Maurand Romain; Rickhaus Peter; Schönenberger Christian; Makk Péter;
The Capri Spring School on Transport in Nanostructures Talk given at a conference Cooper-pair splitting and spectroscopy in double quantum dot devices with superconducting charge injector 27.04.2014 Capri, Italy Schönenberger Christian; Schindele Jens;
International Workshop on “Building blocks for carbon-based electronics: From molecules to nanotubes Talk given at a conference Ballistic interference in ultraclean graphene. 10.04.2014 Regensburg, Germany Rickhaus Peter; Maurand Romain; Makk Péter; Schönenberger Christian;
Swiss Japanese Workshop Talk given at a conference Suspended bilayer and monolayer graphene 09.10.2013 Tsukuba, Japan Makk Péter; Schönenberger Christian; Maurand Romain; Rickhaus Peter;
Swiss Japanese Workshop Talk given at a conference Probing Andreev bound states with a Cooper pair splitter 09.10.2013 Tsukuba, Japan Schindele Jens;


Associated projects

Number Title Start Funding scheme
134619 Electric Transport Phenomena in Nanoscaled Devices 01.04.2011 Project funding (Div. I-III)
127885 NCCR Nanoscale Science: Impact on Life Sciences, Sustainability, Information and Communication Technologies (phase III) 01.06.2009 National Centres of Competence in Research (NCCRs)
129378 ENTS: Entangled spin pairs in graphene 01.03.2010 Project funding (special)
160152 Quantentransport Phänomene in Nanostrukturierten Devices 01.04.2015 Project funding (Div. I-III)
150774 Quantum Entanglement in Nanoelectronic Devices by Noise Measurements 01.01.2014 R'EQUIP

Abstract

The quantum world is by far larger than the classical one. It is entanglement, closely linked to non-locality, that spans this larger space manifold. Entanglement plays a central role in emerging quantum technology aiming to harvest quantum space. The nanoelectronics group at the University of Basel (www.nanoelectronics.ch) uses a superconductor connected to two quantum-dots in parallel to generate spin entangled electron pairs (ESR pairs). The two electrons of one pair exit through different leads as illustrated in the above figure. In this device, the Cooper-pairs in the superconductor are the resources providing the entanglement. This is why we also term this device “Cooper pair splitter” (CPS). CPS and related devices will be realized in three low-dimensional material systems, in carbon nanotubes (CNTs), graphene and semiconducting nanowires (NWs). These low dimensional systems have attracted a growing interest in recent years due to the unique properties of charge and spin which stem from strong spin-orbit interaction in NWs and chiral, neutrino-like properties of the quasiparticles in graphene and CNTs. The combination of high-quality low-dimensional materials, such as NWs, CNTs and graphene with nanostructured superconducting and ferromagnetic materials in so-called hybrid devices not only allows the realization and study of CPS, but also provides versatile experimental platforms for the exploration of a wide range of novel physical phenomena, including, for example, unconventional superconductivity, proximity-induced electron correlations and Majorana fermions. Specifically, we will work on improved tunable CPS devices, detect the electrons in the two channels with noise correlation experiments and explore specular Andreev reflection in gateable graphene devices. Ferromagnetic contacts will serve as spin probes and will be applied in combination with superconducting contacts. Finally, we will use CPS and Andreev spectroscopy as a tool to characterize the two ends of a semiconducting NW coupled to an s-wave superconductor which may host Majorana fermions.Information on the group can be found under: www.nanoelectronics.ch
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