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Courses
  • CMP
    Condensed Matter Physics

  • IOT
    Introductory Optics and Thermodynamics

  • HIOT
    Honors Introductory Optics and Thermodynamics

  • SSP
    Solid-State Physics

  • TCM
    Theory of Condensed Matter

  • HIRQP
    Honors Introductory Relativity and Quantum Physics

Grants
  • Funding agency logo
    Distinct Photophysics of the Spin-Entangled Triplet-Triplet Versus Free Triplets in Organic Semiconductors

    Principal Investigator (PI)

    2018

    $450.0K
    Active
  • Funding agency logo
    Electron correlation effects on excited state behavior of carbon-based semiconductors

    Principal Investigator (PI)

    2012

    $480.0K
  • Funding agency logo
    Photophysics of Conjugated Polymer Thin Films and Semiconducting Single-Walled Carbon Nanotubes

    Principal Investigator (PI)

    2007

    $342.1K
  • Funding agency logo
    Theory of Coexisting Density Waves in Low Dimensional Quarter-Filled Band Molecular Solids

    Principal Investigator (PI)

    2006

    $712.7K
News
  • UA Annual Teaching Award Winners Announced

    2007

  • Three UA Physicists Elected as 2002 American Physical Society Fellows

    2002

Publications (166)
Recent
  • Free Triplets Versus Bound Triplet-Triplet Biexciton in Intramolecular Singlet Fission Materials: Structure-Property Correlations

    2020

  • Wave Function Based Analysis of Dynamics versus Yield of Free Triplets in Intramolecular Singlet Fission

    2020

  • Sr$_2$RuO$_4$, like doped cuprates and barium bismuthate, is a negative charge-transfer gap even parity superconductor with $\frac{3}{4}$-filled oxygen band

    2020

  • Correlated Electronic Properties of a Graphene Nanoflake: Coronene

    2019

  • Theory of triangular lattice quasi-one-dimensional charge-transfer solids

    2019

  • From charge- and spin-ordering to superconductivity in the organic charge-transfer solids R. T. Clay, S. Mazumdar

    2019

  • Valence transition model of the pseudogap, charge order, and superconductivity in electron-doped and hole-doped copper oxidesed

    2018

  • Optical probes of the quantum-entangled triplet-triplet state in a heteroacene dimer

    2018

  • Diagrammatic Exciton Basis Theory of the Photophysics of Pentacene Dimers

    2017

  • Transient Magnetophotoinduced Absorption Studies of Photoexcitations in pi-Conjugated Donor-Acceptor Copolymers

    2017

  • Theory of Transient Excited State Absorptions in Pentacene and Derivatives: Triplet-Triplet Biexciton versus Free Triplets

    2017

  • Bond patterns and charge order amplitude in 1/4-filled charge-transfer solids

    2017

  • Coulomb-enhanced superconducting pair correlations and paired-electron liquid in the frustrated quarter-filled band

    2016

  • Coulomb enhancement of superconducting pair-pair correlations in a 3/4-filled model for kappa-(BEDT-TTF)(2)X

    2016

  • Correlated electronic properties of some graphene nanoribbons: A DMRG study

    2016

  • Theory of Primary Photoexcitations in Donor-Acceptor Copolymers

    2015

  • Theory of Singlet Fission in Polyenes, Acene Crystals, and Covalently Linked Acene Dimers

    2015

  • Electron correlations and two-photon states in polycyclic aromatic hydrocarbon molecules: A peculiar role of geometry

    2014

  • Theory of metal-intercalated phenacenes: Why molecular valence 3 is special

    2014

  • Comment on Tuning the Magnetic Dimensionality by Charge Ordering in the Molecular TMTTF Salts

    2014

  • The Chemical Physics of Unconventional Superconductivity

    2014

  • Subgap two-photon states in polycyclic aromatic hydrocarbons: Evidence for strong electron correlations

    2014

  • Does singlet fission enhance the performance of organic solar cells?

    2013

  • Absence of superconductivity and valence bond order in the Hubbard-Heisenberg model for organic charge-transfer solids

    2013

  • Absence of long-range superconducting correlations in the frustrated half-filled-band Hubbard model

    2012

  • Is there a common theme behind the correlated-electron superconductivity in organic charge-transfer solids, cobaltates, spinels, and fullerides?

    2012

  • Beyond the quantum spin liquid concept in frustrated two dimensional organic superconductors

    2012

  • Triplet excitations in carbon nanostructures

    2012

  • Similarities in electronic properties of organic charge-transfer solids and layered cobaltates

    2012

  • Ground state and finite temperature behavior of 1/4-filled band zigzag ladders

    2012

  • Paired electron crystal: Order from frustration in the quarter-filled band

    2011

  • Evidence for excimer photoexcitations in an ordered π-conjugated polymer film

    2011

  • Theory of carrier concentration-dependent electronic behavior in layered cobaltates

    2011

  • Bipolaron density-wave driven by antiferromagnetic correlations and frustration in organic superconductors

    2010

  • Cooperative orbital ordering and Peierls instability in the checkerboard lattice with doubly degenerate orbitals

    2010

  • Theory of interfacial charge-transfer complex photophysics in π -conjugated polymer-fullerene blends

    2010

  • The paired-electron crystal in the two-dimensional frustrated quarter-filled band

    2010

  • From valence bond solid to unconventional superconductivity in the organic charge-transfer solids

    2009

  • Electron-electron interaction effects on the photophysics of metallic single-walled carbon nanotubes

    2009

  • Local singlets, frustration, and unconventional superconductivity in the organic charge-transfer solids

    2009

  • Correlated-electron description of the photophysics of thin films of π -conjugated polymers

    2009

  • Photophysics of charge-transfer excitons in thin films of π -conjugated polymers

    2008

  • Quantum critical transition from charge-ordered to superconducting state in the negative- U extended Hubbard model on a triangular lattice

    2008

  • Infrared investigation of the charge ordering pattern in the organic spin ladder candidate (DTTTF) sub 2 /sub Cu(mnt) sub 2 /sub

    2008

  • Absence of superconductivity in the half-filled band hubbard model on the anisotropic triangular lattice

    2008

  • The quantum interference effect transistor

    2007

  • π -electron theory of transverse optical excitons in semiconducting single-walled carbon nanotubes

    2007

  • Elucidation of the electronic structure of semiconducting single-walled carbon nanotubes by electroabsorption spectroscopy

    2007

  • Pinned low-energy electronic excitation in metal-exchanged vanadium oxide nanoscrolls

    2007

  • Temperature-driven transition from the Wigner crystal to the bond-charge-density wave in the quasi-one-dimensional quarter-filled band

    2007

  • Charge ordering and spin gap transitions in quarter-filled ladders

    2006

  • Photophysics of excitons in quasi-one-dimensional organic semiconductors: Single-walled carbon nanotubes and π -conjugated polymers

    2006

  • Quantitative calculations of the excitonic energy spectra of semiconducting single-walled carbon nanotubes within a π -electron model

    2006

  • Dimerization-induced enhancement of the spin gap in the quarter-filled two-leg rectangular ladder

    2006

  • Controlling quantum transport through a single molecule

    2006

  • Excitons in semiconducting single-walled carbon nanotubes

    2005

  • Density matrix renormalization group study of conjugated polymers with transverse π-conjugation

    2005

  • Role of electron-electron interactions on spin effects in electron-hole recombination in organic light emitting diodes

    2005

  • Cooperative density wave and giant spin gap in the quarter-filled zigzag electron ladder

    2005

  • Magnetism in BEDT-TTF materials

    2005

  • Charge ordering and local-singlet formation in quarter-filled band charge-transfer solids and oxides of early transition metals

    2005

  • Electron-electron interaction effects on the optical excitations of semiconducting single-walled carbon nanotubes

    2004

  • Ultrafast excited state absorption and charge separation in phenylene-based conjugated polymers

    2004

  • Charge order in quasi-one-dimensional organic charge-transfer solids

    2003

  • Designing π-conjugated polymers with light emission in the infrared

    2003

  • Electron correlation effects in electron-hole recombination in organic light-emitting diodes

    2003

  • The ubiquitous 1100 charge ordering in organic charge-transfer solids

    2003

  • Sub-Poissonian shot noise in molecular wires

    2003

  • Theory of excited-state absorption in phenylene-based π-conjugated polymers

    2003

  • Pattern of charge ordering in quasi-one-dimensional organic charge-transfer solids

    2003

  • Infrared light emission from π-conjugated polymers: A diagrammatic exciton basis valence bond theory

    2003

  • Electron correlation effects in electron-hole recombination and triplet-triplet scattering in organic light emitting diodes

    2003

  • Dimensionality dependence of optical nonlinearity and relaxation dynamics in cuprates

    2002

  • Charge Ordering in θ-(BEDT-TTF) sub 2 /sub X Materials

    2002

  • Comment on origin of giant optical nonlinearity in charge-transfer-mott insulators: A new paradigm for nonlinear optics [1] (multiple letters)

    2002

  • Formation cross-sections of singlet and triplet excitons in π-conjugated polymers

    2001

  • Re-integerization of fractional charges in the correlated quarter-filled band

    2001

  • Interband two-photon transition in Mott insulator as a new mechanism for ultrafast optical nonlinearity

    2001

  • Electron correlation and photo physics of phenyl substituted polyacetylenes

    2001

  • The nature of the insulating state in organic superconductors

    2001

  • One-dimensional cuprate as a nonlinear optical material for ultrafast all-optical switching

    2001

  • Photophysics of phenyl-substituted polyacetylenes, theory

    2001

  • Low-dimensional perovskite copper oxide as a nonlinear optical material for all-optical switching

    2001

  • Erratum: Formation cross-sections of singlet and triplet excitons in π-conjugated polymers (Nature (2001) 409 (494-497))

    2001

  • Ultrafast optical nonlinearity in the quasi-one-dimensional Mott insulator Sr sub 2 /sub CuO sub 3 /sub

    2000

  • Bond-order and charge-density waves in the isotropic interacting two-dimensional quarter-filled band and the insulating state proximate to organic superconductivity

    2000

  • Prospects for the polymer nanoengineer

    2000

  • Giant and ultrafast optical nonlinearity in low dimensional perovskite copper oxides

    2000

  • Electron-correlation-induced transverse delocalization and longitudinal confinement in excited states of phenyl-substituted polyacetylenes

    2000

  • Theory of coexisting charge and spin-density waves in (TMTTF) sub 2 /sub Br, (TMTSF) sub 2 /sub PF sub 6 /sub and α-(BEDT-TTF) sub 2 /sub MHg(SCN) sub 4 /sub

    1999

  • Comment on Wigner crystal type of charge ordering in an organic conductor with a quarter-filled band: (DI-DCNQI) sub 2 /sub Ag

    1999

  • Diagrammatic exciton-basis valence-bond theory of linear polyenes

    1999

  • Theory of even-parity states in polyphenylenes

    1999

  • Designing Emissive Conjugated Polymers with Small Optical Gaps: A Step Towards Organic Polymeric Infrared Lasers

    1999

  • Optical absorption in the substituted phenylene-based conjugated polymers: Theory and experiment

    1997

  • What do nonlinear optical spectroscopy and picosecond photinduced absorption have to say about excited states in conjugated polymers?

    1997

  • Essential excitations in phenylene-based conjugated polymers

    1997

  • Coulomb interactions and linear, nonlinear, and triplet absorption in poly(para-phenylenevinylene)

    1997

  • Energy diagram of triplet and singlet excited states in conjugated polymers

    1997

  • Excitons and optical absorption in one-dimensional extended Hubbard models with short- and long-range interactions

    1997

  • Systematic characterization of excited states in π -conjugated polymers

    1997

  • Optical absorption in the substituted PPVs: Theory and experiment

    1997

  • Theory of biexcitons in mixed and segregated stack charge-transfer solids, molecular crystals and π-conjugated polymers

    1996

  • A new class of collective excitations: Exciton strings

    1996

  • Exciton-to-biexciton transition in quasi-one-dimensional organics

    1996

  • Excitons and biexcitons in poly(para-phenylenevinylene)

    1995

  • Stable biexcitons in conjugated polymers

    1995

  • Theory of photoexcitations in phenylene-based polymers

    1995

  • Optical probes of excited states in poly(p-phenylenevinylene)

    1994

  • Even parity states in PPV, polythiophene and polysilanes

    1994

  • Exciton strings in an organic charge-transfer crystal

    1994

  • Four-level `essential states' model of an optical nonlinearity in π-conjugated polymers

    1994

  • Observation of three resonances in the third harmonic generation spectrum of conjugated polymers: Evidence for the four-level essential states model

    1994

  • Observation of excitonic strings in a quasi-one dimensional charge transfer crystal

    1994

  • Intensities of two-photon absorptions to low-lying even-parity states in linear-chain conjugated polymers

    1994

  • Excitons in poly(para-phenylenevinylene)

    1994

  • Leng et al. reply

    1994

  • Role of the conduction band in electroabsorption, two-photon absorption, and third-harmonic generation in polydiacetylenes

    1993

  • Excitonic n-string in linear chains

    1993

  • Coexisting CDW and BOW in organic conductors with non-half-filled bands

    1993

  • Metal-insulator transitions and electron-phonon interactions in organic conductors

    1993

  • A four-level essential states model of third order optical nonlinearity in π-conjugated polymers

    1993

  • High energy two-photon states in finite versus infinite polyenes

    1992

  • Microscopic theory of third-harmonic generation and electro-absorption in conjugated polymers

    1992

  • On the tight-binding theory of C sub 60 /sub

    1992

  • Comment on: Interchain dispersion and second hyperpolarizability of conjugated polymers

    1992

  • Electro-absorption in a polydiacetylene

    1992

  • Microscopic mechanism of optical nonlinearity in conjugated polymers and other quasi-one-dimensional systems

    1991

  • The phase diagram of 2:1 cationic organic charge transfer salts

    1991

  • Essential-states mechanism of optical nonlinearity in -conjugated polymers

    1991

  • Normal state broken symmetries in quasi-two-dimensional, quarter-filled charge-transfer solids

    1991

  • Roles of band states and two-photon transitions in the electroabsorption of a polydiacetylene

    1991

  • Determination of interaction parameters in peierls-hubbard models describing finite polyenes and polyacetylene

    1991

  • Excitonic optical nonlinearity in conjugated polymers and aromatic molecular chromophores - A theoretical approach

    1991

  • Novel valence-transition model for the pressure-induced metal-to-insulator transition in the organic conductor (2,5DM-DCNQI) sub 2 /sub Cu

    1991

  • Effects of zinc substitution on the electron superconductor Nd1.85Ce0.15CuO4-

    1990

  • Electronic excited states in conjugated polymers

    1989

  • Experimental predictions for the normal state of electron-doped high-temperature superconductors

    1989

  • Comment on peierls instability in the two-dimensional half-filled Hubbard model

    1989

  • Organic superconductivity: An experiment based theory

    1988

  • Coulomb correlations, broken symmetries and dimensionality effects

    1988

  • Towards a unified theory of segregated stack organic charge-transfer solids

    1987

  • Coulomb correlation effects in quasi-one-dimensional conductors

    1986

  • MOLECULAR DESIGN AND INTERPLAY OF STRUCTURAL, OPTICAL AND ELECTRONIC PROPERTIES IN POLYDIACETYLENES.

    1986

  • Bond alternation in the infinite polyene: Effect of long-range Coulomb interactions

    1986

  • Extended PPP model: 2 sup 1 /sup A and 1 sup 3 /sup B states of polydiacetylene fragments

    1986

  • Correlations and defect energies [1]

    1986

  • Quantum monte carlo studies of electron-electron interaction effects in conducting polymers

    1986

  • Unified theory of segregated-stack organic charge-transfer solids: Magnetic properties

    1986

  • MODIFIED PPP APPROACH TO POLYDIACETYLENE EXCITATIONS.

    1986

  • Broken Symmetries in a One-Dimensional Half-Filled Band with Arbitrarily Long-Range Coulomb Interactions

    1985

  • Electron-electron interactions and broken symmetry in one dimension

    1984

  • Interacting charge-ordered states in a correlated diatomic polymer

    1984

  • Soliton energetics in Peierls-Hubbard models

    1984

  • Electron-electron interaction effects on Peierls dimerization in a half-filled band

    1984

  • Correlation effects on charge-density waves in narrow-band one-dimensional conductors

    1984

  • Coulomb effects on one-dimensional peierls instability: The peierls-hubbard model

    1983

  • Valence-bond analysis of extended Hubbard models: Charge-transfer excitations of molecular conductors

    1981

  • Valence bond theory of narrow-band conductors

    1979

  • Magnetic analog of the mott transition

    1979

  • Magnetic gap and partial charge transfer in mixed donor-acceptor stacks

    1978

  • Neutral-ionic interface in organic charge-transfer salts

    1978

  • Triplet spin excitons in organic charge transfer complexes

    1978

  • VALENCE BOND THEORY OF ORGANIC CHARGE-TRANSFER SALTS.

    1978

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