Ole Rømer Colloquium

Title:

Exploring the attosecond frontier of matter

Speaker:

Eleftherios Goulielmakis,  Max-Planck-Institut für Quantenoptik

Abstract:

Having the shortest optical^1,2,3 and soft x-ray fields⁴ as a part of its repertoire, attosecond physics has recently opened up new avenues for exploring ultrafast electronic processes in atoms^5,6,  molecules⁷, surfaces⁸ and nanostructures⁹. I will discuss how modern advancements of the “ultrafast toolbox” allow for the first time, the exploration and control of fundamental electronic phenomena in the nanoscale.  Electron motion in bulk media, driven by intense, precisely-sculpted, optical fields give rise to controllable electric currents, the frequency of which extends to the multi-Petahertz range^9-10, advancing lightwave electronics¹⁰ to new realms of speed and precision.  Coherent extreme ultraviolet radiation emerging by these coherent charge oscillations⁹ offers direct insight into structural and dynamical properties of the underlying medium which were previously inaccessible to conventional solid-state spectroscopies. By endowing essential x-ray spectroscopies of solids with attosecond temporal resolution, optical half-cycle fields, combined with extreme ultraviolet pulses, offer for the first time, access into the attosecond dephasing of electronic excitation of highly-correlated condensed phase electronic systems¹¹. We anticipate these new capabilities to result in far reaching implications to fundamental and applied, electronic and photonic sciences.

[1] Goulielmakis  E. et al., Science 305, 1267 (2004) [2] Wirth  A. et al., Science 334, 195 (2011). [3] Hassan M. Th  et al., Nature  530,66 ( 2016) [4] Goulielmakis  E.et al., Science 320, 1614 (2008).[5] Goulielmakis  E. et al., Nature 466, 739 (2010). [6] Kienberger R. et al., Nature 427, 817 (2004) [6], Smirnova et. al, Nature 460,972(2009) [7] Cavalieri A L et al., Nature 449,1029 (2007) [8] Krueger M et al. Nature 475,78 (2011) [9] Luu T.T. et al., Nature 521,498  (2015), Garg  et .al., Nature  538, 359 in print (2016), [10] Goulielmakis E. et al., Science 317, 769 (2007). [11] Moulet A. et al., Science in print (2017)

Coffee and cake will be available from 3.05pm