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Step-scan time-domain terahertz magneto-spectroscopy.

D Molter¹, G Torosyan, G Ballon

¹Fraunhofer Institute for Physical Measurement Techniques IPM, Department of Terahertz Measurement and Systems, Erwin-Schroedinger-Str., Building 56, 67663 Kaiserslautern, Germany. daniel.molter@ipm.fraunhofer.de

|March 16, 2012

Summary

We developed a new terahertz time-domain spectroscopy method for magneto-optic studies. This technique combines a pulsed magnet with terahertz spectroscopy to analyze materials like GaAs under magnetic fields.

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Area of Science:

Condensed Matter Physics
Terahertz Spectroscopy
Magneto-Optics

Background:

Magneto-optic phenomena are crucial for understanding electron dynamics in materials.
Traditional terahertz spectroscopy methods have limitations in studying these effects under pulsed magnetic fields.

Purpose of the Study:

To introduce a novel terahertz time-domain spectroscopy (THz-TDS) approach for investigating magneto-optic phenomena.
To demonstrate the capability of the system for analyzing carrier dynamics in semiconductors.

Main Methods:

Integration of a tabletop pulsed magnet with a standard THz-TDS system.
Utilizing repetitive operation of the pulsed magnet and step-wise increment of the delay time.
Measurement of magneto-transmission spectra for various semiconductor samples (Ge, GaAs, InSb, InAs).

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Main Results:

Successfully obtained cyclotron resonance spectra in the 200 GHz to 2 THz range for magnetic fields up to 6 T.
Demonstrated the technique's effectiveness on hole gas in Ge and electron gas in GaAs, InSb, and InAs.
Detailed analysis of GaAs spectra using Drude model simulations provided insights into electron behavior.

Conclusions:

The developed THz-TDS system offers a powerful and versatile tool for studying magneto-optic effects.
This method enables detailed characterization of carrier dynamics in semiconductors under high magnetic fields.