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Related Concept Videos

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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Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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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.
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Bonding in Metals02:32

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Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
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A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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Strange Metals as Ersatz Fermi Liquids.

Dominic V Else1, T Senthil1

  • 1Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Physical Review Letters
|September 3, 2021
PubMed
Summary

Researchers explored the origins of strange non-Fermi liquid metals, identifying conditions for temperature-linear resistivity down to absolute zero. This work reveals necessary conditions for exotic quantum phenomena in correlated electron systems.

Area of Science:

  • Correlated electron physics
  • Quantum materials science
  • Condensed matter theory

Background:

  • Understanding strange non-Fermi liquid metals is a fundamental challenge in correlated electron physics.
  • These materials exhibit unusual properties, notably resistivity linear with temperature (T).

Purpose of the Study:

  • To determine the requirements for achieving non-Fermi liquid physics down to zero temperature in translationally invariant metals.
  • To investigate the implications of frequency-dependent conductivity satisfying omega/T scaling.

Main Methods:

  • Theoretical analysis combining existing arguments on 'ersatz Fermi liquids' with new insights.
  • Investigation of the low-energy fixed point physics governing T-linear resistivity.
  • Analysis of symmetry properties and emergent conserved quantities.

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Main Results:

  • Demonstrated that T-linear resistivity originates from the intrinsic physics of the low-energy fixed point under specific conditions.
  • Showed the necessary existence of a diverging susceptibility for a specific type of operator (odd under inversion and time reversal, zero crystal momentum).
  • Identified potential experimental consequences and loopholes.

Conclusions:

  • Established a theoretical framework for understanding non-Fermi liquid behavior in translationally invariant metals.
  • Highlighted the crucial role of symmetry and emergent quantities in these exotic states.
  • Opened avenues for further experimental investigation into quantum materials.