Fermi liquids are a theoretical framework that describes the normal state of most metals at low temperatures, where the interactions between electrons can be treated as perturbations to a non-interacting Fermi gas. This model successfully explains many properties of metals, such as electrical conductivity and specific heat, by considering quasiparticles with well-defined energy and momentum near the Fermi surface.

Fermi Liquids

Fermi liquids

A theoretical framework is a foundational structure that guides research by providing a clear lens for understanding and analyzing the relationships between variables. It integrates existing theories and knowledge to form a coherent system that supports the formulation of hypotheses and interpretation of results.

theoretical framework

The 'Normal State' refers to a stable equilibrium condition in physical, psychological, or systemic contexts where no external disturbances or irregularities are present. This state serves as a baseline against which variations and deviations are measured, allowing for the assessment of disturbances or the effectiveness of interventions.

normal state

most metals

low temperatures

interactions between electrons

non-interacting Fermi gas

Electrical conductivity is a measure of a material's ability to allow the flow of an electric current, which is determined by the availability and mobility of charge carriers such as electrons or ions. It is a critical property in determining the suitability of materials for applications in electronics, energy transmission, and electrochemical processes.

electrical conductivity

Specific heat is the amount of heat required to raise the temperature of one gram of a substance by one degree Celsius. It is a crucial property in thermodynamics that determines how substances absorb and transfer heat energy, influencing everything from climate patterns to cooking processes.

specific heat

Quasiparticles are emergent phenomena that occur in many-body systems, where the collective behavior of particles can be described as if they were individual particles with modified properties. They provide a useful framework for understanding complex interactions in condensed matter physics, such as in superconductors and quantum Hall systems.

quasiparticles

well-defined energy

Well-defined momentum

The Fermi surface is a crucial construct in solid state physics that represents the collection of points in reciprocal space where the energy of electrons equals the Fermi energy at absolute zero temperature. It provides profound insights into the electronic properties of metals, influencing phenomena such as electrical conductivity and superconductivity.

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