Berlin 2018 – wissenschaftliches Programm

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SYTH: Symposium Terahertz physics: toward probing and controlling of materials on the nanoscale

SYTH 1: Terahertz Physics: Toward Probing and Controlling of Materials on the Nanoscale

SYTH 1.3: Hauptvortrag

Donnerstag, 15. März 2018, 10:30–11:00, H 0105

Nonlinear responses and 2D spectroscopy using THz electric and magnetic fields — •Keith A Nelson — Department of Chemistry, MIT, Cambridge, MA, USA

Terahertz fields have been used to drive nonlinear responses of electronic, vibrational, molecular rotational, and spin degrees of freedom. In some cases far-from-equilibrium responses have been induced, including electronic/structural phase transitions in correlated electron materials and colossal Stark shifts and electroluminescence of quantum dots. These will be reviewed and two-dimensional THz spectroscopy of molecular rotations and collective spin waves (magnons) will be described. Linear spectroscopy of molecular and collective spin states will also be discussed, including THz electron paramagnetic resonance (EPR) measurements of high-spin transition metal zero-field splittings and measurements of magnon-phonon-polaritons in hybrid ferroelectric/antiferromagnetic waveguides and cavities. Prospects for new THz field-induced states of matter will be suggested.