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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.
Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
Characteristics of Fluids01:31

Characteristics of Fluids

Fluids differ from solids primarily in their molecular structure and stress response. Solids have tightly packed molecules with strong intermolecular forces, maintaining their shape and resisting deformation. In contrast, fluids have molecules spaced farther apart with weaker forces, allowing them to flow and deform easily.
Fluids, which include both liquids and gases, are substances that deform continuously under shearing stress. For example, water and oil are liquids with molecules that can...
Characteristics of Fluids01:20

Characteristics of Fluids

When a force is applied parallel to the top surface of a solid, it resists the applied force due to the internal frictional forces between the layers of the solid known as shearing resistance. However, when the force is removed, the shearing forces restore the original shape of the solid. Other deformation forces also cause temporary changes in shape if the forces are not beyond a threshold magnitude. Solids tend to retain their shape, making the study of their rest and motion easier. Beyond...
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Superconductor01:24

Superconductor

A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...

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Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials
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Observation of a superfluid Hall effect.

Lindsay J LeBlanc1, Karina Jiménez-García, Ross A Williams

  • 1National Institute of Standards and Technology, and University of Maryland, Gaithersburg, MD 20899, USA.

Proceedings of the National Academy of Sciences of the United States of America
|June 16, 2012
PubMed
Summary
This summary is machine-generated.

Researchers observed the Hall effect in ultracold neutral atoms for the first time. This superfluid Hall signal in Bose-Einstein condensates aligns with hydrodynamic predictions, influenced by the system's irrotationality.

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Area of Science:

  • Condensed-matter physics
  • Quantum mechanics
  • Atomic physics

Background:

  • The Hall effect is crucial for measuring carrier properties in semiconductors.
  • It's sensitive to internal system properties, unlike conventional resistance.
  • Quantum Hall effects highlight its importance in strongly interacting systems.

Purpose of the Study:

  • To report the first observation of the Hall effect in ultracold neutral atoms.
  • To investigate Hall effect phenomena in Bose-Einstein condensates (BECs).
  • To compare experimental results with hydrodynamic predictions.

Main Methods:

  • Measuring transport properties of a Bose-Einstein condensate.
  • Applying a synthetic magnetic field to the ultracold atomic gas.
  • Observing the transverse Hall voltage perpendicular to current and synthetic field.

Main Results:

  • Successfully observed a Hall effect in a Bose-Einstein condensate of neutral atoms.
  • Measurements were conducted on a vortex-free superfluid system.
  • Experimental findings showed good agreement with hydrodynamic predictions.

Conclusions:

  • The Hall effect can be observed in ultracold neutral atomic gases.
  • The superfluid Hall signal is influenced by the system's global irrotationality.
  • This work extends Hall effect studies to new quantum systems.