Non-Fermi liquids are a class of materials that do not conform to the traditional Fermi liquid theory, which describes the normal state of most metals at low temperatures. They exhibit unusual properties like anomalous temperature dependence of resistivity and non-quasiparticle excitations, often found in high-temperature superconductors and heavy fermion systems.

Non-Fermi Liquid

Non-Fermi liquids

Fermi liquid theory is a theoretical framework used to describe the normal state of most metals at low temperatures, where the interactions between electrons can be understood in terms of quasi-particles that behave like non-interacting particles. This theory successfully explains the properties of electrons in a metal, such as electrical and thermal conductivity, by considering how these quasi-particles respond to external fields and interactions.

Fermi liquid theory

traditional Fermi liquid theory

normal state of most metals

low temperatures

anomalous temperature dependence of resistivity

non-quasiparticle excitations

High-temperature superconductors are materials that exhibit superconductivity at temperatures significantly higher than those of traditional superconductors, often above the boiling point of liquid nitrogen (-196°C). This breakthrough has potential applications in energy-efficient power transmission, magnetic levitation, and advanced medical imaging technologies due to their ability to conduct electricity without resistance.

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