Related Experiment Video
Updated: Sep 10, 2025
10:36
Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials
Published on: January 21, 2016
10.7K
Electrically Induced Bulk and Edge Excitations in the Fractional Quantum Hall Regime
Quentin France1,2, Yunhyeon Jeong1, Akinori Kamiyama1
1Tohoku University, Department of Physics, Sendai 980-8578, Japan.
Physical Review Letters
|August 27, 2025
Summary
Researchers electrically excited a two-dimensional electron liquid in the fractional quantum Hall state, observing bulk excitations that align with the magnetoplasmon model. This study reveals potential for exploring quantum gravity analogs using these excitations.
Area of Science:
- Condensed Matter Physics
- Quantum Hall Effect
- Solid-State Physics
Background:
- The fractional quantum Hall effect (FQHE) describes electron liquid behavior in 2D systems under strong magnetic fields.
- Collective excitations, such as magnetoplasmons, are crucial for understanding FQHE properties.
Purpose of the Study:
- To investigate collective excitations in the bulk and edge of a two-dimensional electron liquid at the ν=2/3 FQHE state.
- To explore the dynamics and characteristics of electrically excited states.
Main Methods:
- Applying voltage pulses to electrically excite the incompressible region of a 2D electron liquid.
- Utilizing photoluminescence spectral energy shifts to detect bulk and edge excitations.
- Conducting real-space and time-resolved measurements to analyze excitation dynamics.
Main Results:
- Electrically exciting the 2D electron liquid revealed collective excitations in both bulk and edge regions.
- An offset voltage pulse significantly enhanced the excitation signal.
- Bulk excitations exhibited dynamics consistent with the magnetoplasmon model, with a group velocity of ~3x10^4 m/s.
Conclusions:
- The observed bulk excitations align with the magnetoplasmon model.
- Results suggest a connection between bulk and edge magnetoplasmons and potential for entanglement, akin to photon polarization.
- This work offers a novel approach to studying solid-state analogs of quantum gravity.
Related Concept Videos
01:30The Hall Effect
2.7K
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.
2.7K
01:23Atomic Nuclei: Nuclear Relaxation Processes
718
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis, the precessing magnetic moments are randomly oriented around the z-axis.
718
01:26Electric Field at the Surface of a Conductor
4.8K
Consider a conductor in electrostatic equilibrium. The net electric field inside a conductor vanishes, and extra charges on the conductor reside on its outer surface, regardless of where they originate.
In the 19th century, Michael Faraday conducted the famous ice pail experiment to prove that the charges always reside on the surface of a conductor. The experimental set-up consists of a conducting uncharged container mounted on an insulating stand. The outer surface of the container is...
In the 19th century, Michael Faraday conducted the famous ice pail experiment to prove that the charges always reside on the surface of a conductor. The experimental set-up consists of a conducting uncharged container mounted on an insulating stand. The outer surface of the container is...
4.8K
01:27Induced Electric Fields: Applications
1.9K
An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
1.9K
01:28Standing Waves in a Cavity
1.0K
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
1.0K
02:32The de Broglie Wavelength
26.3K
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...
26.3K