[PDF] Top 20 Quantum point contact as a probe of a topological superconductor

... tunnel contact. The advantage of a ballistic contact over a tunnel contact as a probe of the topological phase is the strongly reduced sensitivity to finite voltage or ... See full document

... strongly on the position of the Fermi level and only when the Fermi level corresponds to a conductance plateau a doubling of the conductance is found. The deviations from the factor- of-2 enhancement, when the Fermi ... See full document

... In fact, the 1D channel in QPC can behave as a resonant cavity for the electron wave. In the ballistic regime the two-probe resistance of QPC stems entirely from ”contact resistance” between 1D conducting ... See full document

... a topological superconductor is broken in two places, as shown in ...the superconductor is cut there will be Majorana bound ...two quantum states which differ by the parity of the number of ... See full document

... invariant thermal conductivity g = 1/π , regardless of whether the system is disordered or not, 13 but in our helical model, the conductivity at the critical point scales ballistically ∝ L in the absence of ... See full document

... thickness of the oxide overlayer is dependent on the du- ration of the oxidation process that was varied from 20 min up to 24 hours. Then, the Hall geometry windows were cut in the oxide overlayer after preparing a mask ... See full document

... obtaining topological superconductivity in spin – orbit-coupled systems ...or quantum point contact tunnelling experiments [18]) that might establish the existence of Majorana modes in these ... See full document

... To probe the topological phase transition, we contact the graphene superlattice at x = 0 and x = L by pristine-graphene electrodes, heavily doped so that the Fermi energy in the pristine graphene is ... See full document

... superconducting point contact as well as more complicated ...conclusion, superconductor hybrids still provide a very relevant and inter- esting field of research specifically for the study of ... See full document

... The critical current is discretized in units of eAo/ti, dependent on the energy gap ΔΟ of the bulk superconductor but not on the junction parameters.. To achieve this analogue of the c[r] ... See full document

... Using this technique, we have been able to observe the quantum size effects in the thermopower [4], Peltier coeffi- cient and thermal conductance [5] of a quantum point contact, äs well[r] ... See full document

... We have used a current heating techniquef to ob- serve the characteristic quantum size effects in the thermo-electric properties of a quantum point contact. Our previous work on the quan[r] ... See full document

... photons produced by a classical current thus behave as inde- pendent classical particles. Quantum fluctuations of the cur- rent 共with I共t兲 and I共t ⬘ 兲 noncommuting operators兲 change the photostatistics. The ... See full document

... frustration, the number of vortices per plaquette. Then the resulting mean field problem is exactly the Harper-Azbel-Wannier-Hofstadter problem, where energy gaps do exist. The quantum Hall behaviors of such a ... See full document

... vanishes. Quantum fluctuations caused by spin flips, which give rise to spin waves, will create however nonzero density of topological ...of topological monopoles in the two-leg Heisenberg ... See full document

... FIG. 2. Dispersive charge sensing of the double quan- tum dot. (a) SET current ∆I (left) and rf phase response ∆φ (right) obtained near the (1, 0)-(0, 1) inter-dot transition. Current and phase relative to a reference ... See full document

... In the second part we propose a new model for a Fractional Topological Insulator. We consider a metallic disk, and take advantage of the strong spin orbit interaction in the presence of a parabolic potential. We ... See full document

... Stochastic cocycles on operator algebras were introduced by Accardi (under the name quantum Markovian cocycles) for Feynman-Kac type perturbation of quan- tum dynamical semigroups ([Acc]). Earlier work on a ... See full document

... single point, therefore the mathematical degeneracy may be related to the concept of wavefunction collapse in quantum mechanics where the classical observables such as position and momentum can only be ... See full document

... We discuss thc analogy betwccn thc axial mode spcctium of an optical resonator with one or two phase-conjugating mirrors, and the quasipaiticle excitation spectium ot an NS or SNS |uncti[r] ... See full document