نتایج جستجو برای: superconducting energy gap
تعداد نتایج: 812569 فیلتر نتایج به سال:
boron nitride semiconducting zigzag swcnt, $b_{cb}$$n_{cn}$$c_{1-cb-cn}$, as a potential candidate for making nanoelectronic devices was examined. in contrast to the previous dft calculations, wherein just one boron and nitrogen doping configuration have been considered, here for the average over all possible configurations, density of states (dos) was calculated in terms of boron and nitrogen ...
We show how a local pairing model for superconductivity can be used to describe the symmetry breaking mechanism in exact analogy to the case of quantum crystal and antiferromagnets. We find that there are low energy states associated with the symmetry breaking process which are not influenced by the Anderson-Higgs mechanism. The presence of these ’thin spectrum’ states in qubits based on superc...
We report on investigations of the superconducting energy gap of the A15 superconductor Nb3Sn by pointcontact spectroscopy of breakjunctions. The voltage-dependent differential conductance dI /dV reveals features of a second energy gap besides the energy gap known from previous tunnel measurements with maxima at 1=3.92 0.16 meV and 2=0.85 0.17 meV as derived from a histogram summarizing the dat...
Superconducting qubits probe environmental defects such as nonequilibrium quasiparticles, an important source of decoherence. We show that "hot" nonequilibrium quasiparticles, with energies above the superconducting gap, affect qubits differently from quasiparticles at the gap, implying qubits can probe the dynamic quasiparticle energy distribution. For hot quasiparticles, we predict a non-negl...
We have measured the temperature dependences of Uie relaxation time of the superconducting order parameter and of the equilibrium energy gap close to the transition temperature in very clean films of aluminum. The results are onlyconsistent with the temperature and energy gap dependence predicted by Schmid and Schän. We also show that the magnitude and mean free path dependence of the electron ...
The phonon spectrum emitted by superconducting Al-tunneling junctions is analyzed by experiments, in which two junctions of different energy gaps are used as phonon generator and detector. The energy gap of the Al-films is varied by the evaporation conditions. The experiments show clearly that the phonon spectrum and the quasiparticle distributions in the generator are strongly nonthermal and d...
We study the superconducting state of the hole-doped two-dimensional Hubbard model using cellular dynamical mean-field theory, with the Lanczos method as impurity solver. In the underdoped regime, we find a natural decomposition of the one-particle (photoemission) energy gap into two components. The gap in the nodal regions, stemming from the anomalous self-energy, decreases with decreasing dop...
One of the central tenets of conventional theories of superconductivity, including most models proposed for the recently discovered iron-pnictide superconductors, is the notion that only electronic excitations with energies comparable to the superconducting energy gap are affected by the transition. Here, we report the results of a comprehensive spectroscopic ellipsometry study of a high-qualit...
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