Superballistic flow of viscous electron fluid induced by edge magnetoplasmons in point contacts
In narrow conductors, electron-electron collisions can create a viscous fluid state, allowing conductivity beyond ballistic transport into the superballistic regime. Point contacts made from ultrahigh-mobility two-dimensional electron gas serve as a platform to study this effect. Under microwave irradiation, edge magnetoplasmons in point contacts are excited and strongly influence electron dynamics. This study uses photoconductivity signals - changes from microwave exposure -
Researchers have demonstrated a phenomenon called superballistic electron flow in narrow conductors, where electrons behave like a viscous fluid due to frequent collisions. This fluid-like behavior allows for conductivity exceeding standard ballistic transport limits. The study utilized point contacts made from a high-quality two-dimensional electron gas and subjected them to microwave irradiation. This irradiation excited edge magnetoplasmons, which significantly altered the electron dynamics and were observed to induce the superballistic flow. The findings were supported by analyzing how photoconductivity varied with the size of the contact, the applied magnetic field, and the microwave power.
This research provides experimental evidence for a novel hydrodynamic electron transport regime, offering insights into fundamental quantum fluid dynamics in nanoscale electronic devices.
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