326 citations · 1.7k across the 59 of their papers we have counts for
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Doping asymmetry in the three-band Hamiltonian for cuprate ladders: failure of the standard model of superconductivity in cuprates
Jeong-Pil Song, Sumit Mazumdar, R. Torsten Clay
The relevance of the single-band two-dimensional Hubbard model to superconductivity in the doped cuprates has recently been questioned, based on Density matrix Renormalization Grou…
Valence Transition Theory of the Pressure-Induced Dimensionality Crossover in Superconducting SrCaCuO
Jeong-Pil Song, R. Torsten Clay, Sumit Mazumdar
More than three decades after the discovery of superconductivity (SC) in the cuprates, the nature of the "normal" state and the mechanism of SC remain mysterious. One popular theor…
Absence of Luther-Emery Superconducting Phase in the Three-Band Model for Cuprate Ladders
Jeong-Pil Song, Sumit Mazumdar, R. Torsten Clay
Correlated-electron theories of superconductivity in layered cuprates often start from the premise of a gapped spin-liquid phase proximate to the superconducting state. This assump…
Free Triplets versus Bound Triplet-Triplet Biexciton in Intramolecular Singlet Fission Materials: Structure-Property Correlations
Souratosh Khan, Sumit Mazumdar
Recent advances in singlet-fission research make it imperative that structure-property correlations that determine optical signatures of the triplet-triplet spin biexciton as well…
Theory of triangular lattice quasi-one-dimensional charge-transfer solids
R. T. Clay, N. Gomes, S. Mazumdar
Recent investigations of the magnetic properties and the discovery of superconductivity in quasi-one-dimensional triangular lattice organic charge-transfer solids have indicated th…
Optical Probes of the Quantum-Entangled Triplet-Triplet State in a Heteroacene Dimer
Souratosh Khan, Sumit Mazumdar
The nature and extent of the spin-entanglement in the triplet-triplet biexciton with total spin zero in correlated-electron -conjugated systems continues to be an enigma. Differ…
The Valence Transition Model of Pseudogap, Charge-Order and Superconductivity in Electron- and Hole-Doped Copper Oxides
Sumit Mazumdar
We present a valence transition model for electron- and hole-doped cuprates, within which there occurs a discrete jump in ionicity Cu Cu upon doping, at or near o…
Diagrammatic Exciton Basis Theory of the Photophysics of Pentacene Dimers
Souratosh Khan, Sumit Mazumdar
Covalently linked acene dimers are of interest as candidates for intramolecular singlet fission. We report many-electron calculations of the energies and wavefunctions of the optic…
Normal state of metal-intercalated phenacene crystals: Role of electron correlations
Tirthankar Dutta, Sumit Mazumdar
In this work we study the effect of long range electron-electron correlations on the behavior of the normal state of metal-intercalated phenacene crystals. While the individual phe…
Coulomb enhancement of superconducting pair-pair correlations in a -filled model for -(BEDT-TTF)X
W. Wasanthi De Silva, N. Gomes, S. Mazumdar +1
We present the results of precise correlated-electron calculations on the monomer lattices of the organic charge-transfer solids -(BEDT-TTF)X for 32 and 64 molecular sites.…
Theory of Singlet Fission in Polyenes, Acene Crystals and Covalently Linked Acene Dimers
Karan Aryanpour, Alok Shukla, Sumit Mazumdar
We report quadruple configuration interaction calculations within the extended PariserParrPople Hamiltonian on the excited states of aggregates of polyenes, crystalline acene…
Comment on "Tuning the Magnetic Dimensionality by Charge Ordering in the Molecular TMTTF Salts"
A. B. Ward, R. T. Clay, S. Mazumdar
Yoshimi et al. [arXiv:1110.3573] have attempted to explain the pressure(P)-dependent behavior of Fabre salts which exhibit charge order (CO), antiferromagnetic (AFM), and spin-Peie…
Theory of metal-intercalated phenacenes: Why molecular valence 3 is special
Tirthankar Dutta, Sumit Mazumdar
We develop a correlated-electron minimal model for the normal state of charged phenanthrene ions in the solid state, within the reduced space of the two lowest antibonding molecula…
Subgap Two-Photon States in Polycyclic Aromatic Hydrocarbons: Evidence for Strong Electron Correlations
K. Aryanpour, A. Roberts, A. Sandhu +3
Strong electron correlation effects in the photophysics of quasi-one-dimensional -conjugated organic systems such as polyenes, polyacetylenes, polydiacetylenes, etc., have been…
Electron Correlations and Two-Photon States in Polycyclic Aromatic Hydrocarbon Molecules: A Peculiar Role of Geometry
K. Aryanpour, A. Shukla, S. Mazumdar
We present numerical studies of one- and two-photon excited states ordering in a number of polycyclic aromatic hydrocarbon molecules: coronene, hexa-peri-hexabenzocoronene and circ…
Does Singlet Fission Enhance the Performance of Organic Solar Cells?
K. Aryanpour, J. A. Muñoz, S. Mazumdar
Singlet fission, in which the optical spin-singlet exciton dissociates into two low energy triplet excitons, has been proposed as a viable approach to enhance the quantum efficienc…
Absence of long-range superconducting correlations in the frustrated 1/2-filled band Hubbard model
S. Dayal, R. T. Clay, S. Mazumdar
We present many-body calculations of superconducting pair-pair correlations in the ground state of the half-filled band Hubbard model on large anisotropic triangular lattices. Our…
Is there a common theme behind the correlated-electron superconductivity in organic charge-transfer solids, cobaltates, spinels and fullerides?
Sumit Mazumdar, R. Torsten Clay
We posit that there exist deep and fundamental relationships between the above seemingly very different materials. The carrier concentration-dependences of the electronic behavior…
Beyond the quantum spin liquid concept in frustrated two dimensional organic superconductors
R. T. Clay, S. Dayal, H. Li +1
The occurrence of antiferromagnetism in kappa-(ET)_2X can be understood within an effective 1/2-filled band with dimers of ET molecules containing one hole each. We argue that whil…
Evidence for Excimer Photoexcitations in an Ordered π-Conjugated Polymer Film
K. Aryanpour, C. -X. Sheng, E. Olejnik +4
We report pressure-dependent transient picosecond and continuous-wave photomodulation studies of disordered and ordered films of 2-methoxy-5-(2-ethylhexyloxy) poly(para-phenylenevi…
Absence of superconductivity in the half-filled band Hubbard model on the anisotropic triangular lattice
R. T. Clay, H. Li, S. Mazumdar
We report exact calculations of magnetic and superconducting pair-pair correlations for the half-filled band Hubbard model on an anisotropic triangular lattice. Our results for the…
Quantum critical transition from charge-ordered to superconducting state in the triangular lattice negative-U extended Hubbard model
S. Mazumdar, R. T. Clay
We demonstrate a robust frustration-driven charge-order to superconductivity transition in the half-filled negative-U extended Hubbard model. Superconductivity extends over a broad…
Essential optical states in -conjugated polymer thin films
Zhendong Wang, Sumit Mazumdar, Alok Shukla
We develop a theory of the electronic structure and photophysics of interacting chains of -conjugated polymers to understand the differences between solutions and films. While p…
Temperature-driven transition from the Wigner Crystal to the Bond-Charge-Density Wave in the Quasi-One-Dimensional Quarter-Filled band
R. T. Clay, R. P. Hardikar, S. Mazumdar
It is known that within the interacting electron model Hamiltonian for the one-dimensional 1/4-filled band, the singlet ground state is a Wigner crystal only if the nearest neighbo…