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Related Concept Videos

First Law: Particles in Two-dimensional Equilibrium01:18

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Recall that a particle in equilibrium is one for which the external forces are balanced. Static equilibrium involves objects at rest, and dynamic equilibrium involves objects in motion without acceleration; but it is important to remember that these conditions are relative. For instance, an object may be at rest when viewed from one frame of reference, but that same object would appear to be in motion when viewed by someone moving at a constant velocity.
Newton's first law tells us about...
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Newton's first law of motion states that a body at rest remains at rest, or if in motion, remains in motion at constant velocity, unless acted on by a net external force. It also states that there must be a cause for any change in velocity (a change in either magnitude or direction) to occur. This cause is a net external force. For example, consider what happens to an object sliding along a rough horizontal surface. The object quickly grinds to a halt, due to the net force of friction. If...
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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...
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Electric potential can be pictorially represented as a three-dimensional surface. On such a surface, the electric potential is constant everywhere. The equipotential surface is always perpendicular to the electric field lines, and while it is three-dimensional, it can be treated as an equipotential line in a two-dimensional case. These equipotential lines are also always perpendicular to electric field lines. The term equipotential is often used as a noun, referring to an equipotential line or...
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Related Experiment Video

Updated: Sep 29, 2025

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Emergent quasiparticles at Luttinger surfaces.

Michele Fabrizio1

  • 1International School for Advanced Studies (SISSA), Via Bonomea 265, 34136, Trieste, Italy. fabrizio@sissa.it.

Nature Communications
|March 24, 2022
PubMed
Summary

Dispersive quasiparticles with infinite lifetimes exist near Luttinger surfaces, contrary to prior beliefs. These quasiparticles exhibit conventional thermodynamic and dynamic properties, including quantum oscillations and linear specific heat.

Area of Science:

  • Condensed Matter Physics
  • Quantum Mechanics

Background:

  • Fermi and Luttinger surfaces are defined by poles and zeros of the Green's function in periodic electron systems.
  • Well-defined quasiparticles are typically associated with Fermi surfaces, not Luttinger surfaces where the density of states vanishes.

Purpose of the Study:

  • To investigate the existence and properties of quasiparticles near Luttinger surfaces.
  • To challenge the conventional understanding of quasiparticle behavior in relation to Luttinger surfaces.

Main Methods:

  • Analysis of the single-particle Green's function.
  • Theoretical investigation of electronic systems with pseudo-gapped Luttinger surfaces.

Main Results:

  • Dispersive quasiparticles with infinite lifetimes were found to exist near pseudo-gapped Luttinger surfaces.

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  • These quasiparticles demonstrate conventional thermodynamic and dynamic behaviors.
  • Observed quantum oscillations and linear-in-temperature specific heat, despite vanishing electron density of states.

    • Conclusions:

    • The existence of quasiparticles near Luttinger surfaces is demonstrated, revising established theories.
    • Quasiparticle properties near Luttinger surfaces are analogous to those near Fermi surfaces.
    • Findings are particularly relevant for understanding strongly correlated materials.