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Related Concept Videos

Fermi Level Dynamics01:12

Fermi Level Dynamics

239
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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Fermi Level01:18

Fermi Level

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The Fermi-Dirac function is represented by an S-shaped curve indicating the probability of an energy state being occupied by an electron at a given temperature. The Fermi level is the energy level at which there is a fifty percent chance of finding an electron, and it is positioned between the lower-energy valence band and the higher-energy conduction band.
At absolute zero temperature, electrons fill all energy states up to the Fermi level, leaving upper states empty. As the temperature rises,...
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Phase Transitions: Vaporization and Condensation02:39

Phase Transitions: Vaporization and Condensation

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The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase...
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Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

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Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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Phase Transitions02:31

Phase Transitions

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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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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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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
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Tunable Non-Fermi Liquid Phase from Coupling to Two-Level Systems.

Noga Bashan1, Evyatar Tulipman1, Jörg Schmalian2,3

  • 1Department of Condensed Matter Physics, <a href="https://ror.org/0316ej306">Weizmann Institute of Science</a>, Rehovot 76100, Israel.

Physical Review Letters
|June 21, 2024
PubMed
Summary
This summary is machine-generated.

We explore electron interactions with dynamical two-level systems (TLSs) in metallic glasses. Our findings reveal a transition from Fermi liquid to non-Fermi liquid behavior, with a marginal Fermi liquid at the crossover point.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Many-Body Theory

Background:

  • Metallic glasses exhibit low-energy excitations, such as charge or stripe glasses.
  • Electron scattering off these excitations can be modeled using dynamical two-level systems (TLSs).

Purpose of the Study:

  • To investigate electron behavior coupled to dynamical two-level systems (TLSs) with random interactions.
  • To analyze the theoretical model's phase transitions and emergent electronic states.

Main Methods:

  • Development of a controlled large-N theory for interacting electrons and TLSs.
  • Utilizing a non-Gaussian saddle point approximation, mapping the system to the spin-boson model.
  • Tuning the coupling strength to explore different regimes.

Main Results:

  • The model exhibits a crossover from Fermi liquid to non-Fermi liquid behavior as coupling strength increases.
  • A marginal Fermi liquid state is identified at the critical coupling.
  • The theory is applicable to generic spatial dimensions (d>1).

Conclusions:

  • The study provides a theoretical framework for understanding electron dynamics in disordered metallic systems.
  • It highlights the emergence of non-Fermi liquid states driven by electron-TLS interactions.
  • The findings contribute to the understanding of quantum many-body phenomena in complex materials.