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Proceedings Paper

Ultrafast terahertz spin dynamics: from phonon-induced spin order to coherent magnon control
Author(s): K. W. Kim; M. Porer; C. Bernhard; J. Demsar; A. Pashkin; T. Kampfrath; A. Sell; M. Wolf; A. Leitenstorfer; R. Huber
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Paper Abstract

Ultrashort pulses in the terahertz (THz) spectral range allow us to study and control spin dynamics on time scales faster than a single oscillation cycle of light. In a first set of experiments, we harness an optically triggered coherent lattice vibration to induce a transient spin-density wave in BaFe2As2, the parent compound of pnictide superconductors. The time-dependent multi-THz response of the non-equilibrium phases shows that the ordering quasi-adiabatically follows a coherent lattice oscillation at a frequency as high as 5.5 THz. The results suggest important implications for unconventional superconductivity. In a second step, we utilize the magnetic field component of intense THz transients to directly switch on and off coherent spin waves in the antiferromagnetic nickel oxide NiO. A femtosecond optical probe traces the magnetic dynamics in the time domain and verifies that the THz field addresses spins selectively via Zeeman interaction. This concept provides a universal ultrafast handle on magnetic excitations in the electronic ground state.

Paper Details

Date Published: 21 February 2013
PDF: 12 pages
Proc. SPIE 8623, Ultrafast Phenomena and Nanophotonics XVII, 862307 (21 February 2013); doi: 10.1117/12.2001236
Show Author Affiliations
K. W. Kim, Univ. Konstanz (Germany)
Chungbuk National Univ. (Korea, Republic of)
M. Porer, Univ. Konstanz (Germany)
Univ. Regensburg (Germany)
C. Bernhard, Univ. de Fribourg (Switzerland)
J. Demsar, Univ. Konstanz (Germany)
A. Pashkin, Univ. Konstanz (Germany)
T. Kampfrath, Fritz-Haber-Institut der Max-Planck-Gesellschaft (Germany)
A. Sell, Univ. Konstanz (Germany)
M. Wolf, Chungbuk National Univ. (Korea, Republic of)
A. Leitenstorfer, Univ. Konstanz (Germany)
R. Huber, Univ. Konstanz (Germany)
Univ. Regensburg (Germany)

Published in SPIE Proceedings Vol. 8623:
Ultrafast Phenomena and Nanophotonics XVII
Markus Betz; Abdulhakem Y. Elezzabi; Jin-Joo Song; Kong-Thon Tsen, Editor(s)

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