Nodal-line semimetal HMTSF-TCNQ: Anomalous orbital diamagnetism and charge density wave
arXiv:2106.04295 · doi:10.1103/PhysRevB.104.155202
Abstract
This study investigates the electronic states and physical quantities of an organic charge-transfer complex HMTSF-TCNQ, which undergoes a charge-density-wave (CDW) phase transition at temperature K. A first-principles calculation is utilized to determine that the normal state is a topological semimetal with open nodal lines. Besed on the first-principles calculation, we develop a tight-binding model to investigate the electronic state in detail. Below , the CDW phase is examined in the tight-binding scheme using the mean-field approximation. It is shown that the open nodal lines are deformed into closed ones, and their shapes are sensitive to the order parameter. Using this tight-binding model, we theoretically evaluate the temperature dependencies of two physical quantities: the spin-lattice relaxation time and the orbital magnetic susceptibility. In particular, an anomalous plateau is obtained at low temperatures in the orbital diamagnetism. We presume that this anomalous plateau originates owing to the conflict between the interband diamagnetism, impurity scattering, and the nodal line deformation. We also conduct an experiment to investigate the orbital magnetism, and the results are in excellent quantitative agreement with the theory.
References in corpus (22)
- Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
- Topological Insulators in Three Dimensions
- Topological Insulators with Inversion Symmetry
- Dirac Line Nodes in Inversion Symmetric Crystals
- Symmetry-based Indicators of Band Topology in the 230 Space Groups
- Quantum Anomalous Hall Effect in 2D Organic Topological Insulators
- Quantitative mappings between symmetry and topology in solids
- Evidence for an axionic charge density wave in the Weyl semimetal (TaSe4)2I
- Anomalous orbital magnetism in Dirac-electron systems: Role of pseudo-spin paramagnetism
- Transport Properties and Diamagnetism of Dirac Electrons in Bismuth
- Anomalous Orbital Magnetism and Hall Effect of Massless Fermions in Two Dimension
- Diagnosis for topological semimetals in the absence of spin-orbital coupling
- Theory for the Charge-Density-Wave Mechanism of 3D Quantum Hall Effect
- Orbital magnetism of coupled bands models
- Electronic Properties Close to Dirac Cone in Two-Dimensional Organic Conductor -(BEDT-TTF)I
- Orbital Magnetism and Transport Phenomena in Two Dimensional Dirac Fermions in Weak Magnetic Field
- Orbital Magnetism of Bloch Electrons III. Application to Graphene
- Universal Quantization of Magnetic Susceptibility Jump at Topological Phase Transition
- Electronic Structure of a Single-Component Molecular Conductor [Pd(dddt)] (dddt = 5,6-dihydro-1,4-dithiin-2,3-dithiolate) under High Pressure
- A tight-binding model of an ambient-pressure molecular Dirac electron system
- Tight-Binding Model and Electronic Property of Dirac Nodal Line in Single-Component Molecular Conductor [Pt(dmdt)]
- Characteristic singular behaviors of nodal line materials emerging in orbital magnetic susceptibility and Hall conductivity