RESEARCH ON QUANTUM MATERIALS EXHIBITING NOVEL QUANTUM PHENOMENA, SUCH AS QUANTUM CRITICALITY AND NON-FERMI LIQUID BEHAVIOR

Abstract

Quantum materials represent a class of systems whose properties are governed by strong electron correlations, topological effects, and quantum fluctuations. Among the most intriguing phenomena exhibited by these materials are quantum criticality—the continuous phase transition at absolute zero driven by non thermal parameters—and non Fermi liquid (NFL) behavior, which defies the conventional Landau Fermi liquid framework. This study investigates the microscopic origins, experimental signatures, and theoretical models underlying these phenomena in heavy fermion compounds, unconventional superconductors, and strongly correlated oxides. Using a combination of high resolution transport measurements, thermodynamic probes, and advanced computational modeling based on density functional theory (DFT) and dynamical mean field theory (DMFT), the work identifies key scaling relations, anomalous temperature dependencies, and deviations from quasiparticle coherence that characterize the quantum critical regime. The results demonstrate that NFL behavior emerges naturally near quantum critical points due to enhanced quantum fluctuations, leading to anomalous resistivity, specific heat, and magnetic susceptibility scaling. Furthermore, the study explores how tuning parameters such as pressure, magnetic field, and chemical substitution can drive materials across quantum phase transitions, enabling systematic mapping of their phase diagrams. These findings not only deepen the understanding of emergent quantum phases but also offer insights into engineering materials with tailored quantum properties for applications in quantum computing, spintronics, and high temperature superconductivity.