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Ultrafast Fiske effect in semiconductor superlattices
Yuriy A Kosevich1, Anne Beate Hummel, Hartmut G Roskos
1N. N. Semenov Institute of Chemical Physics, Russian Academy of Sciences, 119991 Moscow, Russia. yukosevich@yahoo.com
Physical Review Letters
|May 23, 2006
Summary
We discovered an ultrafast semiconductor superlattice effect analogous to the Fiske effect. This phenomenon involves coupled electron oscillations, creating a unique elastic rectifying transport channel.
Area of Science:
- Solid State Physics
- Quantum Mechanics
- Condensed Matter Physics
Background:
- Semiconductor superlattices exhibit resonant current enhancement under tilted electric and magnetic fields.
- This resonance occurs when Landau states in adjacent wells align based on field strength ratios.
Purpose of the Study:
- To investigate the ultrafast version of the resonant superlattice effect involving coherent electron wave packets.
- To explore the analogy between this effect and the Fiske effect in superconductors and superfluid weak links.
- To model the transient self-induced current by accounting for damping in coupled electron oscillations.
Main Methods:
- Theoretical modeling of electron wave packet dynamics in superlattices.
- Experimental investigation of the superlattice effect under specific field conditions.
- Analysis of coupled magneto-Bloch and in-plane cyclotron oscillations.
Main Results:
- Demonstrated a profound analogy between the ultrafast superlattice effect and the Fiske effect.
- Identified the coupling of charge oscillations (magneto-Bloch/Josephson) to other oscillators (cyclotron/external modes) as key.
- Showed that this coupling opens an elastic rectifying transport channel.
- Found that transient self-induced current can be modeled by including damping of coupled oscillations.
Conclusions:
- The ultrafast superlattice effect presents a novel quantum transport phenomenon with analogies to classical Josephson effects.
- Properly accounting for oscillation damping is crucial for accurate modeling of transient currents in these systems.
- This research opens avenues for understanding and potentially controlling electron dynamics in advanced semiconductor heterostructures.
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