Molecular Quantum Materials: Electronic Phases and Charge Dynamics in Two-Dimensional Organic Solids

Abstract

This review provides a perspective on recent developments and their implications for our understanding of novel quantum phenomena in the physics of two-dimensional organic solids. We concentrate on the phase transitions and collective response in the charge sector, the importance of coupling of electronic and lattice degrees of freedom and stress an intriguing role of disorder. After a brief introduction to low-dimensional organic solids and their crystallographic structures, we focus on the dimensionality and interactions and emergent quantum phenomena. Important topics of current research in organic matter with sizeable electronic correlations are Mott metal-insulator phase transitions, charge order and ferroelectricity. Highly frustrated two-dimensional systems are established model compounds for studying the quantum spin liquid state and the competition with magnetic long-range order. There are also unique examples of quantum disordered state of magnetic and electric dipoles. Representative experimental results are complemented by current theoretical approaches.

135 pages, 79 figures

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• Thermodynamic and information-theoretic description of the Mott transition in the two-dimensional Hubbard model
• Microscopic phase separation in triangular-lattice quantum spin magnet kappa-(BEDT-TTF)2Cu2(CN)3 probed by muon spin relaxation
• Mott metal-insulator transition on compressible lattices
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• Multiple crossovers and coherent states in a Mott-Peierls insulator
• Charge, Lattice, and Spin Dynamics in Photoinduced Phase Transitions from Charge-Order-Insulator to Metal in Quasi-Two-Dimensional Organic Conductors
• Anomalous enhancement of Wilson ratio in a quantum spin liquid with strong spin-orbital entanglement: the case of Na4Ir3O8
• Insulator-metal transition on the triangular lattice
• Charge-order fluctuations and superconductivity in two-dimensional organic metals
• Charge ordering in θ-(BEDT-TTF)2RbZn(SCN)4: Cooperative effects of electron correlations and lattice distortions
• X-ray Irradiation-induced Carrier Doping Effects in Organic Dimer-Mott Insulators
• Anderson localization effects near the Mott metal-insulator transition
• Signature of Electronic Correlations in the Optical Conductivity of the Doped Semiconductor Si:P
• ${}^{13}$C NMR Study on the Charge-Disproportionated Conducting State in the Quasi-Two-Dimensional Organic Conductor $\alpha$-(BEDT-TTF)${}_2$I${}_3$
• Influence of disorder on incoherent transport near the Mott transition
• Impurity Moments Conceal Low-Energy Relaxation of Quantum Spin Liquids
• Mott transition in the triangular lattice Hubbard model: a dynamical cluster approximation study
• Effects of disorder on the non-zero temperature Mott Transition
• Spin diffusion and magnetic eigenoscillations confined to single molecular layers in the organic conductors kappa-(BEDT-TTF)_2Cu[N(CN)_2X (X=Cl, Br)
• Multiferroicity and magnetoelastic coupling in alpha-Mn2O3: A binary perovskite
• Metal-Insulator Transition in the Dimerized Organic Conductor $\kappa$-(BEDT-TTF)${}_2$Hg(SCN)${}_2$Br
• Melting of charge order in the low-temperature state of an electronic ferroelectric
• Thermal-transport studies of Two-dimensional Quantum Spin Liquids
• Effective model of the electronic Griffiths phase
• Cooperative dynamics in charge-ordered state of alpha-(BEDT-TTF)2I3
• Interplay of dipoles and spins in $\kappa$-(BEDT-TTF)${}_{2}X$, where $X=$ Hg(SCN)${}_2$Cl, Hg(SCN)${}_2$Br, Cu[N(CN)${}_2$]Cl, Cu[N(CN)${}_2$]Br, and Ag${}_2$(CN)${}_3$
• Direct observation of a Fermi liquid-like normal state in an iron-pnictide superconductor
• Coulomb Enhanced Superconducting Pair Correlations in the Frustrated Quarter-Filled Band
• Electrodynamics of quantum spin liquids
• Correlation Effects on Charge Order and Zero-Gap State in the Organic Conductor α-(BEDT-TTF)2I3
• Semimetallic and charge-ordered $\alpha$-(BEDT-TTF)${}_2$I${}_3$: on the role of disorder in dc transport and dielectric properties
• Topological Insulator State due to Finite Spin-Orbit Interaction in an Organic Dirac Fermion System
• Highly repeatable nanoscale phase coexistence in vanadium dioxide films
• Exotic Dirac Cones on the Band Structure of $\alpha$-STF${}_2$I${}_3$ at Ambient Temperature and Pressure
• Site-specific ${}^{13}$C NMR study on locally distorted triangular lattice of organic conductor $\kappa$-(BEDT-TTF)${}_2$Cu${}_2$(CN)${}_3$
• Vanishing Wilson ratio as the hallmark of quantum spin-liquid models
• Beyond the quantum spin liquid concept in frustrated two dimensional organic superconductors
• Importance of anisotropy in the spin-liquid candidate Me3EtSb[Pd(dmit)2]2
• Probing the Mott Physics in $\kappa$-(BEDT-TTF)${}_2$X Salts via Thermal Expansion
• Energy Landscape of Charge Excitations in Boundary Region between Dimer-Mott and Charge Order State in Molecular Solids
• Specific heat maximum as a signature of Mott physics in the two-dimensional Hubbard model
• Excitonic instability of two-dimensional tilted Dirac cones
• Impurities in triangular lattice spin 1/2 antiferromagnet
• Charge and spin criticality for the continuous Mott transition in a two-dimensional organic conductor
• Low-temperature lattice effects in the spin-liquid candidate $\kappa$-(BEDT-TTF)${}_2$Cu${}_2$(CN)${}_3$
• Weak ferromagnetism and glassy state in kappa-(BEDT-TTF)2Hg(SCN)2Br
• Low-Energy Excitations in Quantum Spin-Liquids Identified by Optical Spectroscopy
• Electrically-induced phase transition in $\alpha$-(BEDT-TTF)${}_2$I${}_3$: Indications for high-mobility hot charge carriers
• Chern Insulator Phase in a Lattice of an Organic Dirac Semimetal with Intracellular Potential and Magnetic Modulations
• First-principles study of hydrogen-bonded molecular conductor $\kappa$-H${}_3$(Cat-EDT-TTF/ST)${}_2$
• ESR studies on the spin-liquid candidate $\kappa$-(BEDT-TTF)${}_2$Cu${}_2$(CN)${}_3$: anomalous response below $T=8$ K
• Mott transition and superconductivity in the strongly correlated organic superconductor $\kappa$-(BEDT-TTF)${}_2$Cu[N(CN)${}_2]$Br
• Suppression of superconductivity by non-magnetic disorder in organic superconductor $\kappa$-(BEDT-TTF)${}_2$Cu(NCS)${}_2$
• Importance of van der Waals interactions and cation-anion coupling in an organic quantum spin liquid
• Lattice dynamics coupled to charge and spin degrees of freedom in the molecular dimer-Mott insulator $\kappa$-(BEDT-TTF)${}_2$Cu[N(CN)${}_2$]Cl
• Possible Current-Induced Phenomena and Domain Control in an Organic Dirac Fermion System with Weak Charge Ordering
• Quantum Melting of Magnetic Order in an Organic Dimer-Mott Insulating System
• Topological Properties of τ-Type Organic Conductors with a Checkerboard Lattice
• The origin of the phase separation in partially deuterated $\kappa$-(ET)${}_2$Cu[N(CN)${}_2$]Br studied by infrared magneto-optical imaging spectroscopy
• Domain Wall Conductivity with strong Coulomb interaction of two-dimensional massive Dirac Electrons in the Organic Conductor $\alpha$-(BEDT-TTF)${}_2$I${}_3$
• Electron Correlations in the Quasi-Two-Dimensional Organic Conductor $\theta$-(BEDT-TTF)${}_2$I${}_3$ investigated by ${}^{13}$C NMR
• Anisotropy of Dirac cones and van Hove singularity in an organic Dirac fermion system
• Probing the Ionic Dielectric Constant Contribution in the Ferroelectric Phase of the Fabre-Salts
• Multiferroicity in the frustrated spinel cuprate GeCu${}_2$O${}_4$
• Competition between magnetism and superconductivity in the organic metal $\kappa$-[BEDT-TTF]${}_2$Cu[N(CN)${}_2$]Br
• Tilted Dirac Cone Effect on Interlayer Magnetoresistance in α-(BEDT-TTF)${}_2$I${}_3$
• Transition of a prestine Mott insulator to a correlated Fermi liquid: Pressure-dependent optical investigations of a quantum spin liquid
• Interplay between Structure and Electronic Properties in Organic Conductors
• Magnetic Field-Induced Superconductor-Insulator-Metal Transition in an Organic Conductor: An Infrared Magneto-Optical Imaging Spectroscopy
• Comment on ``Collapse of Coherent Quasiparticle States in $\theta$-(BEDT-TTF)${}_2$I${}_3$ Observed by Optical Spectroscopy''
• Field-induced length changes in the spin-liquid candidate $\kappa$-(BEDT-TTF)${}_2$Cu${}_2$(CN)${}_3$

Cited by in corpus (24)

• Disorder-dominated quantum criticality in moiré bilayers
• Phase coexistence at the first-order Mott-transition revealed by pressure-dependent dielectric spectroscopy of $\kappa$-(BEDT-TTF)${}_2$Cu${}_2$(CN)${}_3$
• Charge Order and Superconductivity as Competing Brothers in Cuprate High-$T_{\mathrm{c}}$ Superconductors
• Magnetocaloric and electrocaloric properties of the Hubbard pair cluster
• Quasi one-dimensional organic conductors: from Fröhlich conductivity and Peierls insulating state to magnetically-mediated superconductivity, a retrospective
• How to recognize the universal aspects of Mott criticality?
• Quantum critical phase of FeO spans conditions of Earth's lower mantle
• Unusually thick metal-insulator domain walls around the Mott point
• Interacting electron spins in $\kappa$-(BEDT-TTF)${}_2$Cu[N(CN)${}_2$]I investigated by ESR spectroscopy
• Raman signatures of the strong intra- and inter-molecular charge oscillations in bis(ethylenedithio)-tetrathiafulvalene (BEDT-TTF) \k{appa}-phase salts
• Charge imbalance in $\lambda$-(BETS)${}_2$GaCl${}_4$ and their interplay with superconductivity
• Spin effect on the low-temperature resistivity maximum in a strongly interacting 2D electron system
• Charge localization in strongly correlated $\kappa$-(BEDT-TTF)${}_2$Cu[N(CN)${}_2$]I due to inherent disorder
• Charge glass in an extended dimer Hubbard model
• Mott domain walls: a (strongly) non-Fermi liquid state of matter
• Absence of superconductivity in the Hubbard dimer model for kappa-(BEDT-TTF)_2X
• Temperature-dependent generalized ellipsometry of the metal-insulator phase transition in low-symmetry charge-transfer salts
• Third-order Electrical Conductivity of the Charge-ordered Organic Salt $\alpha$-(BEDT-TTF)${}_2$I${}_3$
• Electronic properties of the dimerized organic conductor $\kappa$-(BETS)${}_2$Mn[N(CN)${}_2$]${}_3$
• Gapped magnetic ground state in the spin-liquid candidate $\kappa$-(BEDT-TTF)${}_2$Ag${}_2$(CN)${}_3$ suggested by magnetic spectroscopy
• Role of hydrogen bonding in charge-ordered organic conductor $\alpha$-(BEDT-TTF)${}_2$I${}_3$ probed by ${}^{127}$I nuclear quadrupole resonance
• Amplitude mode of charge density wave in TTF[Ni(dmit)2]2 observed by electronic Raman scattering
• ESR Investigations of the Magnetic Anisotropy in $\kappa$-(BETS)${}_2$Mn[N(CN)${}_2$]${}_3$
• Charge- and anion-orderings in the quasi-one-dimensional organic conductor (TMTTF)${}_2$NO${}_3$