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Higher-Order Topology in Bismuth
TLDR
It is established that the electronic structure of bismuth, an element consistently described as bulk topologically trivial, is in fact topological and follows a generalized bulk–boundary correspondence of higher-order: not the surfaces of the crystal, but its hinges host topologically protected conducting modes.
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Proximity-induced superconductivity in DNA.
TLDR
Results imply that DNA molecules can be conducting down to millikelvin temperature and that phase coherence is maintained over several hundred nanometers.
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Energy distribution function of quasiparticles in mesoscopic wires
We have measured with a tunnel probe the energy distribution function of Landau quasiparticles in metallic diffusive wires connected to two reservoir electrodes, with an applied bias voltage. The…
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TUNNELING VIA INDIVIDUAL ELECTRONIC STATES IN FERROMAGNETIC NANOPARTICLES
We measure electron tunneling via discrete energy levels in ferromagnetic cobalt particles less than 4 nm in diameter, using non-magnetic electrodes. Due to magnetic anisotropy, the energy of each…
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Magnetic anisotropy variations and nonequilibrium tunneling in a cobalt nanoparticle.
We present detailed measurements of the discrete electron-tunneling level spectrum within nanometer-scale cobalt particles as a function of magnetic field and gate voltage, in this way probing…
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Energy distribution of electrons in an out-of-equilibrium metallic wire
We have measured with a tunnel probe the energy distribution function of quasiparticles in the middle of a 1:5 µm-long copper wire placed between two reservoirs at different potentials. We find a…
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Superconductivity in ropes of single-walled carbon nanotubes.
TLDR
Measurements on ropes of single-walled carbon nanotubes (SWNT) in low-resistance contact to nonsuperconducting metallic pads, at low voltage and at temperatures down to 70 mK strongly suggest the existence of superconductivity in ropes of SWNT.
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Proximity DC squids in the long junction limit
We report the design and measurement of Superconducting/normal/superconducting (SNS) proximity DC squids in the long junction limit, i.e. superconducting loops interrupted by two normal metal wires…
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Superconducting proximity effect in long superconductor/graphene/superconductor junctions: From specular Andreev reflection at zero field to the quantum Hall regime
We investigate the superconducting proximity effect through graphene in the long diffusive junction limit, at low and high magnetic field. The interface quality and sample phase coherence lead to a…
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Superconducting nanowires by electron-beam-induced deposition
Superconducting nanowires can be fabricated by decomposition of an organometallic gas using a focused beam of Ga ions. However, physical damage and unintentional doping often results from the…
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