Short Biography

Christian Schönenberger holds a degree as an electrical engineer in applied sciences (1979) and a diploma in physics (1986). He did his PhD at the IBM Zurich Research Lab in the group of Dr. H. Rohrer and Dr. S. Alvarado. His PhD is entitled "Understanding Magnetic Force Microscopy" which was awarded with a medal from the ETH-Zurich and the Swiss Physical Society price (1991). Subsequently, he worked at the Philips Research Lab. at Eindoven (NL), first as a postdoc, and later as a permanent staff member. In 1994 he was awarded a fellowship from the Swiss National Science Foundation (Profil-II). Soon afterwards he was elected to a full chair at the Univ. of Basel (1995). Since then, Christian Schönenberger has setup a group whose research focuses on charge transport in nanoscaled devices. He has co-authored over 80 refereed journal publications. He has participated in several EU programs and is currently directing the Swiss Nanoscience Institute at the University of Basel and the Swiss-NSF center on Nanoscale Science and Technology: http://www.nanoscience.ch.

Find Prof. Schönenberger's CV here >>

 

Research Summary

The nanoelectronics group is interested in fundamental electrical properties of engineered nanoscaled devices operating in the quantum regime. We probe these devices by electrical transport measurements both at low (close to DC) and high frequency (GHz range) and at cryogenic temperatures (Kelvin to milli Kelvin). Our devices are based on novel materials with reduced dimensions, either one-dimensional carbon-nanotubes (CNTs), quasi one-dimensional semiconducting nanowires (NWs) or two-dimensional graphene and vand der Waals heterostructures which are defined by state-of-art e-beam lithography and complemented with gate and contact electrodes. The group is internationally recognized as a leader in so-called hybrid quantum devices that embody in addition to normal metal also superconducting and ferromagnetic electrodes. The latter introduce non-trivial correlations by proximity effect, such as a pairing or exchange field. In combination with intrinsic properties and surface effects, new correlated many-body states can arise. Examples are topological states such as the spin-helix states in one-dimension, molecular Andreev-bound states and Majorana-like states. In addition, we are working on suspended ultraclean devices that can additionally be driven mechanically allowing to explore the coupling between mechanical and electrical degrees of freedom at the quantum limit.

 

Selected Publications

C. Schönenberger has more than 200 publications (with over 10’000 citations, excluding self-citations), below is a small selection of key publications (see also google scholar):

  1. Aharonov-Bohm Oscillations in Carbon Nanotubes, A. Bachtold, C. Strunk, J.-P. Salvetat, J.-M. Bonard, L. Forro, T. Nussbaumer, and C. Schönenberger, Nature 397, 673 (1999).
  2. The Fermionic Hanbury-Brown and Twiss Experiment, M. Henny, S. Oberholzer, C. Strunk, T. Heinzel, K. Ensslin, M. Holland, and C. Schönenberger, Science 284, 296 (2000).
  3. A quantum dot in the Kondo regime coupled to superconductors, M. R. Buitelaar, T. Nussbaumer, and C. Schönenberger, Phys. Rev. Lett. 89, 256801 (2002).
  4. Quantum Shot Noise, C. Beenakker and C. Schönenberger, Physics Today 56 (5), 37-42 (2003).
  5. Electric field control of spin transport, S. Sahoo, T. Kontos, J. Furer, C. Hoffmann, M. Gräber, A. Cottet, and C. Schönenberger, Nature Physics 1, 99-102 (2005).
  6. Even-odd effect in Andreev Transport through a Carbon Nanotube Quantum Dot, A. Eichler, M. Weiss, S. Oberholzer, and C. Schönenberger, A. Levy Yeyati, J. C. Cuevas, and A. Martin-Rodero, Phys. Rev. Lett. 99, 126602 (2007).
  7. Cooper-pair splitter realized in a two-quantum-dot Y-junction, L. Hofstetter, C. Csonka, J. Nygard and C. Schönenberger, Nature 461, 960 (2009).
  8. Hybrid superconductor – quantum dot devices, S. De Franceschi, L. Kouwenhoven, C. Schönenbergeer and W. Wernsdorfer, Nature Nanotechnology 5, 703 (2010).
  9. Spontaneously Gapped Ground State in Suspended Bilayer Graphene, F. Freitag, J. Trbovic, M. Weiss, and C. Schönenberger, Phys. Rev. Lett., 108, 76602 (2012).
  10. Near-Unity Cooper Pair Splitting Efficiency, J. Schindele, A. Baumgartner, and C. Schönenberger, Phys. Rev. Lett., 109, 157002 (2012).
  11. Nonlocal spectroscopy of Andreev bound states, J. Schindele, A. Baumgartner, R. Maurand, M. Weiss, and C. Schönenberger, Phys. Rev. B, 89, 45422 (2014).
  12. Snake trajectories in ultraclean graphene p–n junctions, P. Rickhaus, P. Makk, Ming-Hao Liu, E. Tovari, M. Weiss, R. Maurand, and C. Schönenberger, Nature Communications, 6, 6470 (2015).
  13. Clean carbon nanotubes coupled to superconducting impedance-matching circuits, V. Ranjan, G. Puebla-Hellmann, M. Jung, T. Hasler, A. Nunnenkamp, M. Muoth, C. Hierold, A. Wallraff, and C. Schönenberger, Nature Communications, 6, 7165 (2015).
  14. Resonant and Inelastic Andreev Tunneling Observed on a Carbon Nanotube Quantum Dot, J. Gramich, A. Baumgartner, and C. Schönenberger, Phys. Rev. Lett. 115, 216801 (2015).
  15. Giant Valley-Isospin Conductance Oscillations in Ballistic Graphene, C. Handschin, P.Makk, P. Rickhaus, R. Maurand, K. Watanabe, T. Taniguchi, K. Richter, Ming-Hao Liu, and C. Schönenberger, Nano Letters, 17, 5389-5393 (2017).
  16. Measuring a Quantum Dot with an Impedance-Matching On-Chip Superconducting LC Resonator at Gigahertz Frequencies, M. -C. Harabula, T. Hasler, G. Fülöp, M. Jung, V. Ranjan, and C. Schönenberger, Phys. Rev. Appl., 8, 54006 (2017).