Quantum phases driven by strong correlations
By S. Paschen, Qimiao Si. Nature Reviews Physics, 2020
240 citations recorded by the source corpus.
It has long been thought that strongly correlated systems are adiabatically connected to their non-interacting counterpart. Recent developments have highlighted the fallacy of this traditional notion in a variety of settings. In this Review, we use a class of strongly correlated electron systems to illustrate the type of quantum phases and fluctuations that are created by strong correlations. Examples include quantum critical states that violate the Fermi liquid paradigm, unconventional superconductivity that goes beyond the Bardeen–Cooper–Schrieffer framework, and topological semimetals induced by the Kondo interaction. We assess the prospects for designing other exotic phases of matter by using alternative degrees of freedom or alternative interactions, and discuss the potential of these correlated states for quantum technology. Strong correlations may produce states of matter that do not have non-interacting counterparts, with new types of quantum criticality, superconductivity, and topological phases being recent highlights. This Review describes the physics underlying these correlated states and points to their potential for quantum applications. Quantum criticality accumulates entropy, turns quantum matter soft, and makes it prone to the development of exotic excitations and new emergent phases. Strongly correlated electron systems can exhibit quantum critical points with fluctuations beyond those of the vanishing Landau order parameter, as exemplified by electronic localization–delocalization transitions associated with Kondo-destruction quantum criticality. Quantum phases are enriched by the interplay between strong correlations, geometrical frustration, entwined degrees of freedom and hybrid interactions. Strong correlations interplay with spin–orbit coupling and space-group symmetry to drive topological states of matter, as exemplified by Weyl–Kondo semimetals. In quantum materials, we let nature work for us and reveal new physics that we might never have imagined. This leads to models and concepts that could then be studied in artificial settings such as ultracold atomic and photonic systems, and models for gravity.
Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics, Electronic, Optical and Magnetic Materials
View Paper: https://www.semanticscholar.org/paper/ab101496d778f5b9a1793ef008576b2bb6ac45a8
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In Atomic and Molecular Physics, and Optics
Citations in the corpus
- Quantum states and intertwining phases in kagome materials (2023, background): “These phases have been observed in strongly correlated systems, such as heavy fermion materials, high-temperature superconductors, complex oxide perovskites, transition metal dichalcogenides and twisted graphene 3,5–8 .”