Publikation: Ultrafast terahertz spin dynamics : from phonon-induced spin order to coherent magnon control
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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.
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KIM, Kyung Wan, Michael PORER, Christian BERNHARD, Jure DEMSAR, Alexej PASHKIN, Tobias KAMPFRATH, Alexander SELL, Martin WOLF, Alfred LEITENSTORFER, Rupert HUBER, 2013. Ultrafast terahertz spin dynamics : from phonon-induced spin order to coherent magnon control. 2013 Ultrafast phenomena and nanophotonics. San Francisco, California, USA, 3. Feb. 2013 - 6. Feb. 2013. In: BETZ, Markus, ed. and others. Ultrafast phenomena and nanophotonics XVII : 3 - 6 February 2013, San Francisco, California, United States ; [part of SPIE photonics west]. Bellingham: SPIE, 2013, 862307. Proceedings of SPIE. 8623. ISSN 0277-786X. ISBN 978-0-8194-9392-7. Available under: doi: 10.1117/12.2001236BibTex
@inproceedings{Kim2013-02-21Ultra-43341, year={2013}, doi={10.1117/12.2001236}, title={Ultrafast terahertz spin dynamics : from phonon-induced spin order to coherent magnon control}, number={8623}, isbn={978-0-8194-9392-7}, issn={0277-786X}, publisher={SPIE}, address={Bellingham}, series={Proceedings of SPIE}, booktitle={Ultrafast phenomena and nanophotonics XVII : 3 - 6 February 2013, San Francisco, California, United States ; [part of SPIE photonics west]}, editor={Betz, Markus}, author={Kim, Kyung Wan and Porer, Michael and Bernhard, Christian and Demsar, Jure and Pashkin, Alexej and Kampfrath, Tobias and Sell, Alexander and Wolf, Martin and Leitenstorfer, Alfred and Huber, Rupert}, note={Article Number: 862307} }
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