Copyright © by "V.Sz." • All Rights reserved
Chemical Physics Divisiom
SC Nanotubes ....
Nanotube modeling:
Helical method of tube formation for band structure calculations and the anti-adiabatic theory, which covers influence of nuclear dynamics on electronic structure beyond the Born-Oppenheimer approximation, have been applied in study of possible superconductivity in (boron) nanotubes.
Helical method of tube formation for band structure calculations and the anti-adiabatic theory, which covers influence of nuclear dynamics on electronic structure beyond the Born-Oppenheimer approximation, have been applied in study of possible superconductivity in (boron) nanotubes.
Band Structure of Single and Multiwall MgB2 Nanotubes:
Ab initio study of multilayer slabs of MgB2 show that a 25-layer slab approaches the stability of bulk MgB2. The results confirms that the quasi-1D superconductor MgB2 MWNT is a stable structure and can be synthesized.
Ab initio study of multilayer slabs of MgB2 show that a 25-layer slab approaches the stability of bulk MgB2. The results confirms that the quasi-1D superconductor MgB2 MWNT is a stable structure and can be synthesized.
Modeling of relaxation dynamics in frame of nonlinear response theory:
Quantum-statistical formulation of relaxation dynamics of superconductors re-lated to pump-probe spectroscopy (model: high-temperature superconductor MgB2);
use of the electronic structure and of the corresponding Eliashberg function of electron-phonon interactions;
Temperature-dependent relaxation dynamics as a function of delay time between the pump and probe pulses;
Result: an abrupt increase of the relaxation time at Tc is the direct consequence of sudden changes in the character of electron-phonon coupling in transition from an adiabatic to a stabilized superconducting anti-adiabatic state.
Breakdown of the BOA !!!
Quantum-statistical formulation of relaxation dynamics of superconductors re-lated to pump-probe spectroscopy (model: high-temperature superconductor MgB2);
use of the electronic structure and of the corresponding Eliashberg function of electron-phonon interactions;
Temperature-dependent relaxation dynamics as a function of delay time between the pump and probe pulses;
Result: an abrupt increase of the relaxation time at Tc is the direct consequence of sudden changes in the character of electron-phonon coupling in transition from an adiabatic to a stabilized superconducting anti-adiabatic state.
Breakdown of the BOA !!!