Quantum Transport; Nanoelectronics; Charge and Spin Transport in Nanostructures; Superconductivity; Quantum Electronics; Electronic Properties of Nanostructures; Semiconducting Nanowires; Spintronics; Carbon Nanotubes
Scherübl Zoltán, Fülöp Gergő, Moca Cătălin Paşcu, Gramich Jörg, Baumgartner Andreas, Makk Péter, Elalaily Tosson, Schönenberger Christian, Nygård Jesper, Zaránd Gergely, Csonka Szabolcs (2020), Large spatial extension of the zero-energy Yu–Shiba–Rusinov state in a magnetic field, in Nature Communications
, 11(1), 1834-1834.
Bayogan Janice Ruth, Park Kidong, Siu Zhuo Bin, An Sung Jin, Tang Chiu-Chun, Zhang Xiao-Xiao, Song Man Suk, Park Jeunghee, Jalil Mansoor B A, Nagaosa Naoto, Hirakawa Kazuhiko, Schönenberger Christian, Seo Jungpil, Jung Minkyung (2020), Controllable p–n junctions in three-dimensional Dirac semimetal Cd 3 As 2 nanowires, in Nanotechnology
, 31(20), 205001-205001.
Thomas Frederick S, Baumgartner Andreas, Gubser Lukas, Jünger Christian, Fülöp Gergő, Nilsson Malin, Rossi Francesca, Zannier Valentina, Sorba Lucia, Schönenberger Christian (2020), Highly symmetric and tunable tunnel couplings in InAs/InP nanowire heterostructure quantum dots, in Nanotechnology
, 31(13), 135003-135003.
Indolese David, Zihlmann Simon, Makk Péter, Jünger Christian, Thodkar Kishan, Schönenberger Christian (2018), Wideband and On-Chip Excitation for Dynamical Spin Injection into Graphene, in Physical Review Applied
, 10(4), 044053-044053.
Indolese D. I., Delagrange R., Makk P., Wallbank J. R., Wanatabe K., Taniguchi T., Schönenberger C. (2018), Signatures of van Hove Singularities Probed by the Supercurrent in a Graphene-hBN Superlattice, in Physical Review Letters
, 121(13), 137701-137701.
Baba S, Jünger C, Matsuo S, Baumgartner A, Sato Y, Kamata H, Li K, Jeppesen S, Samuelson L, Xu H Q, Schönenberger C, Tarucha S (2018), Cooper-pair splitting in two parallel InAs nanowires, in New Journal of Physics
, 20(6), 063021-063021.
Harabula M.-C., Ranjan V., Haller R., Fülöp G., Schönenberger C. (2018), Blocking-state influence on shot noise and conductance in quantum dots, in Physical Review B
, 97(11), 115403-115403.
Caloz Misael, Perrenoud Matthieu, Autebert Claire, Korzh Boris, Weiss Markus, Schönenberger Christian, Warburton Richard J., Zbinden Hugo, Bussières Félix (2018), High-detection efficiency and low-timing jitter with amorphous superconducting nanowire single-photon detectors, in Applied Physics Letters
, 112(6), 061103-061103.
Gramich J., Baumgartner A., Schönenberger C. (2017), Andreev bound states probed in three-terminal quantum dots, in Physical Review B
, 96(19), 195418-195418.
Harabula M.-C., Hasler T., Fülöp G., Jung M., Ranjan V., Schönenberger C. (2017), Measuring a Quantum Dot with an Impedance-Matching On-Chip Superconducting LC Resonator at Gigahertz Frequencies, in Physical Review Applied
, 8(5), 054006-054006.
Ranjan V., Zihlmann S., Makk P., Watanabe K., Taniguchi T., Schönenberger C. (2017), Contactless Microwave Characterization of Encapsulated Graphene p−n Junctions, in Physical Review Applied
, 7(5), 054015-054015.
A large excitement arose recently in solid-state physics when it was realized that quasi-particles with unconventional properties can appear in edge-states of topological insulators (TI) coupled to a superconductor (SC). The typical TI material is a bulk three-dimensional (3D) crystal or a two-dimensional (2D) film, where, for example, a quantum spin-Hall state can emerge. However, TI have also been considered in one dimension (1D). A particular clean example is a tight-binding chain, the so-called Kitaev chain, of spin-less electrons that are pairwise coupled by a SC. Under appropriate conditions two excitations located at the end of chain appear with properties of a Majorana particle, a particle that is its own antiparticle and referred in this context as Majorana bound-state (MBS). The Kitaev chain has been realized in semiconducting nanowires (SNWs) with large spin-orbit interaction, such as InAs and InSb, and experimental evidence for MBSs is slowly accumulating. Since we have many years of experience in realizing and studying multi-terminal hybrid devices with superconducting contacts, and since there are currently much more theoretical proposals for testing properties of MBSs than actual experiments, we plan with this proposal to embark on this. Both SNWs and carbon nanotubes (CNTs) will form the basis to engineer and explore topological properties. We will in particular study the MBS with high-spectral resolution using quantum-dot based tunneling spectroscopy. We will explore non-local properties in multiterminal devices, compare Andreev-bound states with MBSs and search for, as well as engineer, helical gaps using both intrinsic and synthetic spin-orbit interaction realized by either ferromagnetic side-gates or through hyperfine interaction that can drive a spin-helical state. In addition to conventional DC transport measurements, we will study high-frequency properties, such as the RF admittance, noise properties in novel geometries, such as the phase-controlled Majorana charge-box.