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Transport spectroscopy of induced superconductivity in the three-dimensional topological insulator HgTe
Jonas Wiedenmann, Eva Liebhaber, Johannes Kübert +6
The proximity-induced superconducting state in the 3-dimensional topological insulator HgTe has been studied using electronic transport of a normal metal-superconducting point cont…
Phase-sensitive SQUIDs based on the 3D topological insulator HgTe
Luis Maier, Erwann Bocquillon, Manuel Grimm +6
Three-dimensional topological insulators represent a new class of materials in which transport is governed by Dirac surface states while the bulk remains insulating. Due to helical…
Josephson supercurrent through the topological surface states of strained bulk HgTe
Jeroen B. Oostinga, Luis Maier, Peter Schueffelgen +6
Strained bulk HgTe is a three-dimensional topological insulator, whose surface electrons have a high mobility (30,000 cm^2/Vs), while its bulk is effectively free of mobile charge…
Induced superconductivity in the three-dimensional topological insulator HgTe
Luis Maier, Jeroen B. Oostinga, Daniel Knott +7
A strained and undoped HgTe layer is a three-dimensional topological insulator, in which electronic transport occurs dominantly through its surface states. In this Letter, we prese…
Edge state transport through disordered graphene nanoribbons in the quantum Hall regime
Fabian Duerr, Jeroen B. Oostinga, Charles Gould +1
The presence of strong disorder in graphene nanoribbons yields low-mobility diffusive transport at high charge densities, whereas a transport gap occurs at low densities. Here, we…
Gate-tuned normal and superconducting transport at the surface of a topological insulator
B. Sacepe, J. B. Oostinga, J. Li +4
Three-dimensional topological insulators are characterized by the presence of a bandgap in their bulk and gapless Dirac fermions at their surfaces. New physical phenomena originati…
Magneto-transport through graphene nano-ribbons
Jeroen B. Oostinga, Benjamin Sacepe, Monica F. Craciun +1
We investigate magneto-transport through graphene nano-ribbons as a function of gate and bias voltage, and temperature. We find that a magnetic field systematically leads to an inc…
Electrostatic confinement of electrons in graphene nano-ribbons
Xinglan Liu, Jeroen B. Oostinga, Alberto F. Morpurgo +1
Coulomb blockade is observed in a graphene nanoribbon device with a top gate. When two pn junctions are formed via the back gate and the local top gate, electrons are confined betw…
Aharonov-Bohm effect in graphene
Saverio Russo, Jeroen B. Oostinga, Dominique Wehenkel +4
We investigate experimentally transport through ring-shaped devices etched in graphene and observe clear Aharonov-Bohm conductance oscillations. The temperature dependence of the o…
Gate-induced insulating state in bilayer graphene devices
Jeroen B. Oostinga, Hubert B. Heersche, Xinglan Liu +2
The potential of graphene-based materials consisting of one or a few layers of graphite for integrated electronics originates from the large room-temperature carrier mobility in th…
Bipolar supercurrent in graphene
Hubert B. Heersche, Pablo Jarillo-Herrero, Jeroen B. Oostinga +2
Graphene -a recently discovered one-atom-thick layer of graphite- constitutes a new model system in condensed matter physics, because it is the first material in which charge carri…