Event Details

Condensed Matter seminar

Electron on the surface of liquid helium provides a unique example of particularly well-defined two dimensional electron gas (2DEG) trapped at the interface of a superfluid helium and vacuum. The system facilitates the exploration of 2D non-equilibrium in an almost perfectly clean environment. It has been widely used as a model for studying fundamental phenomena like Wigner crystallization, magneto-transport, coupling of Rydberg states to Landau levels, quantum information processing, zero-resistance states, and a plethora of important results on many-electron phenomena and non-equilibrium physics.

Under certain conditions, the surface electrons exhibit spontaneous oscillations. We have measured the resultant signals induced in 5 Corbino electrodes at ~ 0.3 K, with a perpendicular magnetic field and microwave radiation applied to reach the zero-resistance state. Analysis of these signals using multi-scale, time-resolved, methods that yields results consistent with previously defined inter-edge magnetoplasmons, and illustrated for the first time the modulated by slow surface gravity waves at 5 Hz. Phase coherence and phase coupling between signals from differently-positioned pairs of electrodes enabled reconstruction of the electron dynamics on the helium surface.

We will show that treating the time-resolved dynamics with logarithmic frequency resolution, opens up new possibilities for understanding these paradigmatic far-from-equilibrium phenomena, bringing together the quantum and classical processes involved.

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