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Coherent control of the gap dynamics of BCS superconductors in the nonadiabatic regime

Title data

Papenkort, Thomas ; Kuhn, Tilmann ; Axt, Vollrath M.:
Coherent control of the gap dynamics of BCS superconductors in the nonadiabatic regime.
In: Physical Review B. Vol. 78 (2008) Issue 13 . - No. 132505, 4 Seiten.
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.78.132505

Abstract in another language

By exciting a BCS superconductor with ultrashort pulses in the frequency range of the superconducting gap a nonadiabatic regime can be reached. In this regime the modulus of the order parameter oscillates in time. Although its average value can be identified with the gap in the absorption spectrum, the oscillation itself remains invisible in pump-probe spectra. In this Brief Report we demonstrate that by employing a coherent control-type scheme of excitation by two phase-locked pump pulses this oscillation can be unveiled in the probe spectrum. We find that the reaction of the superconductor to a second pump pulse depends strongly on its instantaneous state at the time of the impact of the second pulse. Based on numerical calculations performed on the mean-field level it is shown that by varying the delay time between the two pump pulses the transient oscillation of the order parameter can be transformed into an oscillation of its long-time value, which shows up in the absorption spectrum of a subsequent weak probe pulse as an oscillation of the gap when plotted as a function of the delay time.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: coherent control; BCS superconductors, nonadiabatic dynamics; Oscillations of the order parameter; pump-probe; coherent dynamics; laser-driven superconductors
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III > Chair Theoretical Physics III - Univ.-Prof. Dr. Martin Axt
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 27 Oct 2017 07:00
Last Modified: 19 Apr 2018 10:47
URI: https://eref.uni-bayreuth.de/id/eprint/40185