What is recorded here?
Feldmann and colleagues studied a biased GaAs/AlGaAs superlattice with time-resolved degenerate four-wave mixing at about 5 K. They observed oscillations in the emitted optical signal whose period changed with the electric field and agreed with the Bloch period inferred from the Wannier–Stark ladder spacing. A two-band calculation with a fitted dephasing time reproduced the signal, supporting their interpretation as coherent Bloch oscillations.
Source-linked catalogue note. A detailed explanatory guide has not yet been prepared for this entry.
Scientific scope
The measured quantity is a time-integrated diffracted optical signal as a function of pulse delay, not a direct trajectory of an individual electron. The oscillations can also be described as quantum beats between Wannier–Stark transitions. The calculation neglects Coulomb effects, and increasing dephasing at higher fields was attributed to carrier escape as a probable explanation. Results concern the specified 5 K semiconductor structure and finite coherence, not persistent oscillation in arbitrary bulk solids. Bloch theory and prior theoretical and experimental Wannier–Stark work retain their separate credit.
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People and systems
J. Feldmann; K. Leo; J. Shah; D. A. B. Miller; J. E. Cunningham; T. Meier; G. von Plessen; A. Schulze; P. Thomas; S. Schmitt-Rink
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English catalogue narrative
Optical four-wave mixing reveals Bloch-period modulation in a semiconductor superlattice
Feldmann and colleagues studied a biased GaAs/AlGaAs superlattice with time-resolved degenerate four-wave mixing at about 5 K. They observed oscillations in the emitted optical signal whose period changed with the electric field and agreed with the Bloch period inferred from the Wannier–Stark ladder spacing. A two-band calculation with a fitted dephasing time reproduced the signal, supporting their interpretation as coherent Bloch oscillations.
Scientific scope
The measured quantity is a time-integrated diffracted optical signal as a function of pulse delay, not a direct trajectory of an individual electron. The oscillations can also be described as quantum beats between Wannier–Stark transitions. The calculation neglects Coulomb effects, and increasing dephasing at higher fields was attributed to carrier escape as a probable explanation. Results concern the specified 5 K semiconductor structure and finite coherence, not persistent oscillation in arbitrary bulk solids. Bloch theory and prior theoretical and experimental Wannier–Stark work retain their separate credit.
Reading status
This is a source-linked WRS catalogue note. A full explanatory guide and independent scientific reconstruction have not been completed for this entry. Read the identified original work for its complete narrative and arguments.
People and systems
J. Feldmann; K. Leo; J. Shah; D. A. B. Miller; J. E. Cunningham; T. Meier; G. von Plessen; A. Schulze; P. Thomas; S. Schmitt-Rink
These are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged.