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O: Fachverband Oberflächenphysik

O 44: Ultrafast Electron Dynamics II (joint session O/MA)

O 44.1: Hauptvortrag

Dienstag, 17. März 2020, 10:30–11:00, WIL B321

Attosecond coherent manipulation of electrons in tunneling microscopy — •Manish Garg¹ and Klaus Kern^{1, 2} — ¹Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany — ²Institut de Physique, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland

We demonstrate coherent manipulation of electrons in a tunnel junction of a scanning tunneling microscope, by tuning the carrier-envelope-phase (CEP) of two-cycle long (< 6 fs) optical pulses. We explore two different tunneling regimes at the tunnel junction, photon and field-driven tunneling and demonstrate transition from one to the other regime. Spatially localized and atomically strong electric fields of strength ~ 1V/Å substantially modulate the tunneling barrier on attosecond timescales, hence allowing taming of flow of electrons to either side of the tunnel junction. Capability to tune CEP with precision of less than 0.1π enables manipulation of electron tunneling at timescales of ~ 200 as. The strong atomic confinement of tunneling current induced by laser pulses enables optical-field driven tunneling microscopy. Real-time tracing of decay dynamics of oscillations of quasiparticles (localized-surface plasmon) in a gold nanorod is studied with a nanoscale probe in tunneling contact; enabling concurrently angstrom-scale and sub-fs resolution. We expect our results to enable inducing, tracking, and controlling electronic current at atomic scales and pave the way to petahertz coherent nanoelectronics and microscopy.