Ultrafast Investigations of Materials using Angle-Resolved Photoemission Spectroscopy with High Harmonic Generation

<p>Knowing the electronic states of materials and how electrons behave in time is essential to\&nbsp;<span style="line-height: 1.6em;">understanding a wide range of physical processes, from surface catalysis and photochemistry to\&nbsp;</span><span style="line-height: 1.6em;">practical electrical behavior of devices. Combining Angle-Resolved Photoemission Spectroscopy\&nbsp;</span><span style="line-height: 1.6em;">(ARPES) with short wavelength high-harmonics to drive the photoemission process allows for the\&nbsp;</span><span style="line-height: 1.6em;">direct probing of a wide range of electronic states and momenta within a material. Furthermore,\&nbsp;</span><span style="line-height: 1.6em;">in a pump-probe approach, electron dynamics can be probed by mapping the response of a system\&nbsp;</span><span style="line-height: 1.6em;">at specific instances after an excitation. I present results from three studies utilizing time-resolved\&nbsp;</span><span style="line-height: 1.6em;">ARPES, spanning the conventional approach of mapping electron/hole dynamics of a material\&nbsp;</span><span style="line-height: 1.6em;">after an excitation - to more exotic experimental schemes that probe fundamental electronic properties\&nbsp;</span><span style="line-height: 1.6em;">via interferometric attosecond electron spectroscopy and band-bending at semiconductor\&nbsp;</span><span style="line-height: 1.6em;">interfaces. In addition to providing information on the fundamental behavior of charge carriers and\&nbsp;</span><span style="line-height: 1.6em;">electronic states in condensed matter, such studies illustrate the versatility of the high harmonic\&nbsp;</span><span style="line-height: 1.6em;">time-resolved ARPES technique, and demonstrate the potential of this technique to be extended\&nbsp;</span><span style="line-height: 1.6em;">with new experimental high-resolution and circular-polarization capabilities.</span></p>
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University of Colorado Boulder
Boulder, CO
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