Shape resonance for the anisotropic superconducting gaps near a Lifshitz transition: the effect of electron hopping between layers

Physics – Condensed Matter – Superconductivity

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

12 pages, 6 figures

Scientific paper

The multigap superconductivity modulated by quantum confinement effects in a superlattice of quantum wells is presented. Our theoretical BCS approach captures the low-energy physics of a shape resonance in the superconducting gaps when the chemical potential is tuned near a Lifshitz transition. We focus on the case of weak Cooper-pairing coupling channels and strong pair exchange interaction driven by repulsive Coulomb interaction that allows to use the BCS theory in the weak-coupling regime neglecting retardation effects like in quantum condensates of ultracold gases. The calculated matrix element effects in the pairing interaction are shown to yield a complex physics near the particular quantum critical points due to Lifshitz transitions in multigap superconductivity. Strong deviations of the ratio $2\Delta/T_c$ from the standard BCS value as a function of the position of the chemical potential relative to the Lifshitz transition point measured by the Lifshitz parameter are found. The response of the condensate phase to the tuning of the Lifshitz parameter is compared with the response of ultracold gases in the BCS-BEC crossover tuned by an external magnetic field. The results provide the description of the condensates in this regime where matrix element effects play a key role.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Shape resonance for the anisotropic superconducting gaps near a Lifshitz transition: the effect of electron hopping between layers does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Shape resonance for the anisotropic superconducting gaps near a Lifshitz transition: the effect of electron hopping between layers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Shape resonance for the anisotropic superconducting gaps near a Lifshitz transition: the effect of electron hopping between layers will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-21590

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.