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
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.
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.
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.
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.
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.
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.
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.
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.
Schindele Jens, Baumgartner Andreas, Maurand Romain, Weiss Markus, Schönenberger Christian (2014), Nonlocal spectroscopy of Andeev bound states, in Phys. Rev. B
, 89, 045422.
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.
Rickhaus Peter, Maurand Romain, Weiss Markus, Liu Ming-Hao, Richter Klaus, Schönenberger Christian (2013), Ballistic interferences in suspended graphene, in Nature Communication
, 4, 2342.
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.
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.
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