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Controlled terahertz emission and electron localization dynamics in semiconductors.
Dynamic localization in semiconductor structures generates terahertz (THz) radiation via intraband currents. Minima in THz yield reveal dynamic localization, controllable by laser field phase and dephasing time.
Area of Science:
- Solid-state physics
- Quantum dynamics
- Terahertz science
Background:
- Dynamic localization, studied since 1986, describes electron behavior in superlattices.
- The connection between dynamic localization and terahertz (THz) radiation generation remains underexplored.
Purpose of the Study:
- Investigate the interplay between dynamic localization and THz radiation in semiconductor structures.
- Identify the primary mechanisms and influencing factors for THz generation under these conditions.
Main Methods:
- Utilized a two-color laser field excitation in semiconductor structures.
- Analyzed intraband current as the source of THz radiation.
- Observed THz radiation yield dependence on laser field strength and relative phase.
Main Results:
- Intraband current identified as the dominant source of THz radiation.
- Minima in THz radiation yield observed at specific laser field strengths, indicating dynamic localization.
- Relative laser field phase and dephasing time were found to manipulate dynamic localization and THz efficiency.
Conclusions:
- Dynamic localization significantly influences THz radiation generation in semiconductor structures.
- Control over THz emission efficiency is achievable by tuning laser parameters and considering dephasing.
- Findings offer insights for simultaneous material investigations across various timescales.
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