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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Diamagnetism01:26

Diamagnetism

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Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
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Fermi Level Dynamics01:12

Fermi Level Dynamics

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The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
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Paramagnetism01:30

Paramagnetism

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Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
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Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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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.
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Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
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Optically controllable magnetism in atomically thin semiconductors.

Kai Hao1, Robert Shreiner1,2, Andrew Kindseth1,2

  • 1Pritzker School of Molecular Engineering, University of Chicago , Chicago, IL 60637, USA.

Science Advances
|September 30, 2022
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Summary
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Researchers demonstrate optical control of ferromagnetic order in transition metal dichalcogenide (TMD) semiconductors using local optical pumping. This method stabilizes magnetic order at zero magnetic field, paving the way for new spin and optical technologies.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Optics

Background:

  • Ferromagnetic order in two-dimensional materials is crucial for spintronics.
  • Controlling magnetism at the nanoscale without external magnetic fields remains a challenge.

Purpose of the Study:

  • To investigate the stabilization and control of ferromagnetic order in electrostatically doped monolayer transition metal dichalcogenide (TMD) semiconductors.
  • To explore the use of local optical pumping as a method to achieve this control.

Main Methods:

  • Utilizing circular dichroism (CD) in reflectivity from excitonic states as a spatially resolved probe.
  • Employing circularly polarized optical pumping at specific electron densities (n ~ 10^12 cm^-2).
  • Conducting time-resolved measurements with pulsed optical excitation.

Main Results:

  • Achieved stabilization and control of ferromagnetic order at zero magnetic field via local optical pumping.
  • Demonstrated carrier polarization exceeding 80% over an 8 μm by 5 μm area.
  • Observed magnetic interactions amplifying pump-induced spin polarization by over an order of magnitude.

Conclusions:

  • Local optical pumping offers a viable method for controlling magnetism in doped TMDs.
  • This technique enables advancements in spin and optical technologies.
  • Provides a new tool for studying correlated phases in two-dimensional electron gases.