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Related Concept Videos

The Hall Effect01:30

The Hall Effect

Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative.
The de Broglie Wavelength02:32

The de Broglie Wavelength

In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
Photoelectric Effect02:26

Photoelectric Effect

When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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Debye–Huckel–Onsager Conductance Equation01:28

Debye–Huckel–Onsager Conductance Equation

The Debye-Hückel-Onsager equation is a cornerstone of physical chemistry, providing a method to determine the molar conductance (Λm) and molar conductance at infinite dilution (Λ°m) for uni-univalent electrolytes.Uni-univalent electrolytes are electrolytes that dissociate in solution to produce one cation with a +1 charge and one anion with a –1 charge per formula unit.This equation addresses two crucial phenomena: the asymmetry effect and the electrophoretic effect. According to this equation,...
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
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Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials
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Optical Hall effect in the integer quantum Hall regime.

Y Ikebe1, T Morimoto, R Masutomi

  • 1Department of Physics, The University of Tokyo, Hongo, Tokyo 113-0033, Japan.

Physical Review Letters
|September 28, 2010
PubMed
Summary
This summary is machine-generated.

Optical Hall conductivity measurements reveal a plateau-like structure in GaAs/AlGaAs heterojunctions, deviating from Drude behavior near Landau level filling ν=2. This suggests carrier localization effects persist in the terahertz regime.

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Area of Science:

  • Condensed matter physics
  • Quantum Hall effect
  • Terahertz spectroscopy

Background:

  • The quantum Hall effect (QHE) is a key phenomenon in 2D electron systems under strong magnetic fields.
  • Understanding the dynamic response of QHE systems in the terahertz (THz) regime is crucial for exploring fundamental physics and potential applications.

Purpose of the Study:

  • To investigate the optical Hall conductivity (σxy(ω)) in a GaAs/AlGaAs heterojunction quantum Hall system.
  • To explore the behavior of the Faraday rotation in the THz frequency range and its relation to Landau level filling.

Main Methods:

  • Measurement of Faraday rotation in a GaAs/AlGaAs heterojunction.
  • Analysis of optical Hall conductivity (σxy(ω)) in the terahertz-frequency regime.
  • Comparison of experimental results with Drude-like behavior and theoretical predictions for carrier localization.

Main Results:

  • The Faraday rotation angle showed a significant deviation from Drude-like behavior around Landau-level filling ν=2.
  • A distinct plateaulike structure was observed in the Faraday rotation, even though it was not quantized.
  • The observed behavior aligns with predictions related to carrier localization effects in the AC regime.

Conclusions:

  • The study indicates that plateau structures in the quantum Hall regime, though not strictly quantized, are observable in the terahertz frequency range.
  • Carrier localization plays a significant role in shaping the optical Hall conductivity response in these systems at THz frequencies.
  • The findings contribute to a deeper understanding of electron dynamics in 2D systems under extreme conditions.