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The field of attosecond science provides exciting opportunities for ultrafast measurement and control at the level of electrons. My research is geared towards the new applications of attosecond spectroscopy to address questions in the areas of Atomic and Molecular Physics, Chemical Physics and Nanomaterials. Research projects in my lab focus on the 1) Generation and application of high-flux attosecond x-ray pulses, 2) Study of charge migration and coupled electron-nuclear dynamics in molecules, 3) Electronic wavepacket dynamics and decoherence, 4) Control of electronic processes with laser fields, 5) Exciton dynamics and electron correlations in two-dimensional materials. Recently, we demonstrated the use of extreme ultraviolet, attosecond light bursts to strobe the motion of an electron in a polyatomic molecule and film its coherent evolution near a conical intersection. At this intersection, the simple energy landscape picture breaks down and the electron is essentially at molecular crossroads. Our results shed light on the question of how strongly electrons and nuclei influence each other during charge transfer.

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Courses
  • IPI
    Introductory Physics I

  • HIRQP
    Honors Introductory Relativity and Quantum Physics

  • MEPI
    Methods in Experimental Physics I

  • AMOP
    Atomic, Molecular, and Optical Physics

  • HIEM
    Honors Introductory Electricity and Magnetism

  • HIM
    Honors Introductory Mechanics

  • AMSEI
    Atomic and Molecular Spectroscopy for Experimentalists I

  • MEPII
    Methods of Experimental Physics II

  • QT
    Quantum Theory

  • IEM
    Introductory Electricity and Magnetism

Grants
  • Funding agency logo
    Application of XUV and Soft-X-Ray Attosecond Spectroscopies to Quantify Vibronic Couplings and Charge Dynamics

    Principal Investigator (PI)

    2022

    $198.8K
    Active
  • Funding agency logo
    MRI: Development of Multiuser Instrument for Attosecond X-Ray Probing of Correlated Quantum Dynamics

    Principal Investigator (PI)

    2019

    $873.6K
    Active
  • Funding agency logo
    Mid-Scale RI-1 (M1:DP): Compact X-Ray Free-Electron Laser Project (CXFEL)

    Principal Investigator (PI)

    2019

    $90.5K
    Active
  • Funding agency logo
    Light-Induced Modification of Electronic Interactions and Electron-Nuclear Couplings

    Principal Investigator (PI)

    2017

    $1.1M
    Active
  • Funding agency logo
    Investigation of Quantum Coherence and Correlated Dynamics Using Attosecond Spectroscopy

    Principal Investigator (PI)

    2019

    $398.2K
  • Funding agency logo
    Studying Correlated Electron Dynamics in Molecules and Materials with Isolated Attosecond Pulses

    Principal Investigator (PI)

    2015

    $321.7K
  • Funding agency logo
    Post-Born-Oppenheimer Dynamics Using Isolated Attosecond Pulses

    Principal Investigator (PI)

    2014

    $769.8K
  • Funding agency logo
    New Applications for Atom Interferometry Using Material Nano-Gratings

    Principal Investigator (PI)

    2013

    $464.0K
  • Funding agency logo
    Tunable ultrafast photon source and imaging system for studying carrier dynamics in graphene devices

    Co-Investigator (COI)

    2012

    $71.6K
  • Funding agency logo
    Preparation and spectroscopy of graphene quantum dots

    Principal Investigator (PI)

    2012

    $14.0K
News
  • Freezing Electrons in Flight

    2012

  • UA Students Named Goldwater Scholars

    2011

Publications (167)
Recent
  • Optical control of the XUV absorption spectra for spin-orbit states in Argon ion

    2023

  • Quantum control of electron dynamics in the continuum

    2023

  • Theoretical study of two photon ionization of atomic argon in pump-probe spectrometry.

    2023

  • Probing the amplitudes and phases of quantum beats in spin-orbit split continua

    2023

  • Development of a soft-x-ray attosecond transient absorption spectroscopy system with a mid-infrared laser driver

    2023

  • Optical Design for a Laboratory-Scale Compact Free Electron Laser based on Inverse Compton Scattering

    2023

  • Photoelectron and transient absorption spectroscopy on molecular Rydberg states of carbon dioxide

    2023

  • A Jaynes-Cummings-Fano Model for Autoionizing Polaritons

    2022

  • A multi-wave mixing study investigating electronic coupling of dark and continuum states in Neon.

    2022

  • Multipolariton control in attosecond transient absorption of autoionizing states

    2022

  • Attosecond transient absorption spectroscopy in ionic systems

    2022

  • Control of atomic ionization using interfering polaritonic pathways

    2022

  • Probing the dynamics of autoionizing states with Raman electron interferometry

    2022

  • Phonon Lifetimes in Boron-Isotope-Enriched Graphene- Hexagonal Boron Nitride Devices

    2022

  • Observation of Quantum beats in two photon ionization of argon.

    2022

  • Probing ultrafast excited-state dynamics using EUV-IR six-wave-mixing emission spectroscopy

    2022

  • Raman Interferometry between Autoionizing States to Probe Ultrafast Wave-Packet Dynamics with High Spectral Resolution

    2022

  • Probing molecular autoionization and dissociation using photoelectron spectroscopy

    2022

  • Theoretical treatment of quantum beats in the argon nf autoionizing states.

    2021

  • Resolving an electronic wavepacket composed of dark autoionizing neutral states in Argon

    2021

  • Investigation of electronic couplings with tunable, background-free, extreme-ultraviolet four-wave mixing

    2021

  • Energy, angle, and time-resolved probing of electron wavepacket dynamics with attosecond pulse trains and tunable laser pulses

    2021

  • Autoionizing polaritons in attosecond atomic ionization

    2021

  • Autoionizing polariton stabilization in attosecond transient absorbtion

    2021

  • Probing and controlling autoionizing polaritons in atomic ionization

    2021

  • Isotopic Effect of Carrier Relaxation in Graphene-hBN Heterostructures

    2021

  • Coupled nuclear–electronic decay dynamics of O 2 inner valence excited states revealed by attosecond XUV wave-mixing spectroscopy

    2021

  • Application of tunable infrared pulses for pump-probe study of XUV photoionization and dissociation dynamics

    2020

  • Light-induced Fano structures and tunable transparency in the Argon continuum

    2020

  • Role of defects and phonons in bandgap dynamics of monolayer WS2 at high carrier densities

    2020

  • Angle-and-time resolved photoionization of neutral Rydberg wave packets in Argon

    2020

  • Quantifying light-induced linear and nonlinear couplings with tunable transient absorption and four-wave-mixing

    2020

  • The ASU Compact XFEL Project

    2020

  • Non-collinear XUV-IR four-wave-mixing to study the dynamics of dark states.

    2020

  • Identifying the Role of Multielectron Excitations in Rydberg State Dissociation of Oxygen with Ultrafast Photoelectron Spectroscopy

    2019

  • Ultrafast Rydberg-state dissociation in oxygen: Identifying the role of multielectron excitations

    2019

  • Tunable high-order frequency mixing for XUV transient absorption and photoelectron spectroscopies

    2019

  • Ultrafast XUV Spectroscopy to Probe Conical Intersections and Excited State Dynamics

    2019

  • Studying Multielectron Excitation and Fragmentation with Ultrafast XUV-IR Spectroscopy

    2019

  • Probing the dynamics of dark states using four-wave mixing processes in the XUV

    2019

  • Time-resolved energy and fluence dependent carrier dynamics in MoS2 and WS2

    2018

  • Attosecond transient absorption and four-wave mixing with tunable IR pulses

    2018

  • Attosecond x-ray science: Probing electron dynamics in molecules and materials

    2018

  • Controlling attosecond transient absorption with tunable, non-commensurate light fields

    2018

  • Investigating Impulsive Strong Field Perturbation of Molecular Rydberg States with XUV Transient Absorption

    2017

  • Controlling electronic couplings with tunable long wavelength pulses: Study of Autler-Townes splitting and XUV emission spectra

    2017

  • Nonlinear Saddle Point Spectroscopy and Electron-Phonon Interaction in Graphene

    2017

  • Evolution of the electronic band structure of twisted bilayer graphene upon doping

    2017

  • Probing autoionizing states of molecular oxygen with XUV transient absorption: Electronic-symmetry-dependent line shapes and laser-induced modifications

    2017

  • Control of laser induced couplings in autoionizing states by XUV transient absorption

    2017

  • Ultrafast Phonon Dynamics in Graphene-hBN Structures

    2017

  • Femtosecond Photoelectron Imaging of Dissociating and Autoionizing States in Oxygen

    2017

  • XUV Transient Absorption Spectroscopy: Probing Laser-Perturbed Dipole Polarization in Single Atom, Macroscopic, and Molecular Regimes

    2017

  • Ultrafast laser control of autoionizing resonances observed in attosecond transient absorption

    2017

  • Ultrafast relaxation of hot phonons in graphene-hBN heterostructures

    2017

  • Global k-space analysis of electron-phonon interaction in graphene and application to M-point spectroscopy

    2016

  • Observing Superexcited State Dynamics in Atomic and Molecular Systems by Attosecond Transient Absorption

    2016

  • Attosecond XUV Transient Absorption in Dense Systems: Interplay between Strong-field Effects and Resonant Pulse Propagation

    2016

  • Attosecond quantum-beat spectroscopy in helium

    2016

  • Global k-space analysis of electron-phonon interaction in graphene

    2016

  • Attosecond transient absorption in dense gases: Exploring the interplay between resonant pulse propagation and laser-induced line-shape control

    2016

  • Attosecond spectroscopy: Application in study of conical intersections

    2015

  • Tunable Ultrafast Photon Source and Imaging System for Studying Carrier Dynamics in Graphene Devices

    2015

  • Using attosecond transient absorption to study non-adiabatic molecular dynamics

    2015

  • Electronic Band Structure Modification upon Doping in Twisted Bilayer Graphene

    2015

  • Investigation of Non-adiabatic Molecular Dynamics with Attosecond Transient Absorption

    2015

  • Beyond the single-atom response in absorption line shapes: probing a dense, laser-dressed helium gas with attosecond pulse trains

    2015

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

    2014

  • Coherent electron hole dynamics near a conical intersection

    2014

  • Transient absorption lineshapes in a dense, laser-dressed Helium target probed by attosecond pulse trains

    2014

  • Attosecond Probing of Charge Transfer Reactions in Polyatomic Molecules

    2014

  • Attosecond Transient Absorption: Spectral Lineshapes in Laser-dressed Atoms and Molecules

    2014

  • Attosecond Quantum Beat Spectroscopy

    2014

  • Gated Raman Spectroscopy of Twisted Bilayer Graphene

    2014

  • Probing electron-phonon interactions at the saddle point in graphene

    2014

  • Coherent motion of an electron hole near a conical intersection: Using time-resolved XUV spectroscopy to study charge dynamics in polyatomics

    2014

  • Optical characterization of electron-phonon interactions at the saddle point in graphene

    2014

  • Time and energy resolved probing of many-body interactions in graphene and heterostructures

    2014

  • Gate dependent Raman spectroscopy of graphene on hexagonal boron nitride

    2013

  • Control over the Dissociation of Highly Excited Oxygen in Attosecond XUV Pump-IR Probe experiments

    2013

  • Optical thickness determination of hexagonal boron nitride flakes

    2013

  • Using attosecond high-harmonics to probe dynamics near conical intersections

    2013

  • Evidence for strong electron correlations in graphene molecular fragments: Theory and experiments on two-photon absorptions

    2013

  • Photoionization dynamics in the presence of attosecond pulse trains and strong fields

    2013

  • Attosecond XUV spectroscopy to study dynamics near conical intersections

    2013

  • Theory of Two-Photon Absorptions in Graphene Fragments

    2012

  • Ultrafast dynamics of neutral superexcited oxygen: A direct measurement of the competition between autoionization and predissociation

    2012

  • A low-cost spatial light modulator for use in undergraduate and graduate optics labs

    2012

  • Quantum Interferences in Helium ionization in the Presence of Attosecond Pulses and Strong Laser Fields

    2012

  • Attosecond-resolved evolution of a laser-dressed helium atom: interfering excitation paths and quantum phases

    2012

  • Two-photon absorption measurements in graphene fragments: Role of electron-electron interactions

    2012

  • Strong Field Control of Atomic and Molecular Dynamics: An Attosecond Resolved Study

    2012

  • Observing the Real-Time Evolution of Helium Atoms in a Strong Laser Field

    2012

  • Atomic, Molecular, and Optical Physics-Ultrafast Dynamics of Neutral Superexcited Oxygen: A Direct Measurement of the Competition between Autoionization and Predissociation

    2012

  • A Direct Measurement of the Dissociative Lifetimes for Superexcited States of Molecular Oxygen

    2012

  • Substrate effects and photon energy dependence of ultrafast carrier relaxation in graphene

    2012

  • Measurement of the absolute timing of attosecond XUV bursts with respect to the driving field

    2012

  • Real-time evolution of a laser-dressed Helium atom: Attosecond-resolved two-color photoionization study

    2011

  • Response of graphene to femtosecond high-intensity laser irradiation

    2011

  • Properties of anisotropically etched graphene devices

    2011

  • Probing Floquet State Dynamics of a Strong Field Dressed He Atom Using Attosecond Pulse Trains

    2011

  • Control over dissociative dynamics in O2^+

    2011

  • Watching the Real-time Evolution of a Laser Modified Atom Using Attosecond Pulses

    2011

  • Ultrafast carrier dynamics in graphene

    2011

  • Response of graphene to intense optical irradiation

    2011

  • Femtosecond and Attosecond Spectroscopy in the XUV regime

    2011

  • IR-assisted ionization of helium by attosecond extreme ultraviolet radiation

    2010

  • Using Ion-imaging to Measure Gouy Phase Shift and Wavefront Distortions for Attosecond Pump-Probe Experiments

    2010

  • Study of Attosecond Electron Dynamics in the Presence of Strong Fields

    2010

  • In situ spatial mapping of Gouy phase slip for high-detail attosecond pump–probe measurements

    2010

  • Using Ion-Imaging to Study the Effect of Gouy Phase Shift and Wave-front Distortions on Attosecond Pump-Probe Measurements

    2010

  • Electronic feshbach resonances created in soft x-ray-induced 02 dissociation

    2009

  • Optimization of few-cycle pulse generation: spatial size, mode quality and focal volume effects in filamentation based pulse compression

    2009

  • Probing Coupled Electronic and Nuclear Dynamics Using Coherent Electrons and X-rays

    2009

  • Characterization and Application of Attosecond Pulse Trains

    2009

  • Autoionization dynamics and Feshbach resonances: Femtosecond EUV study of O2 excitation and dissociation

    2009

  • The creation of super-excited electronic Feshbach resonances by EUV-induced dissociation of O2

    2009

  • Real-time observation of attosecond and femtosecond quantum dynamics using ultrafast lasers

    2009

  • IR-assisted ionization of He by attosecond XUV radiation

    2009

  • Electronic Feshbach Resonances created in Soft X-ray--Induced O2 dissociation

    2009

  • Time-resolved momentum imaging system for molecular dynamics studies using a tabletop ultrafast extreme-ultraviolet light source

    2008

  • Using high-harmonics for probing real-time dynamics of highly excited molecules

    2008

  • Angular-dependence of molecular photoionization cross-sections studied by time-resolved EUV spectroscopy

    2008

  • EUV-Driven Attosecond Processes

    2008

  • Observing the birth of electronic Feshbach resonances and delayed autoionization in soft x-ray induced molecular dissociation.

    2008

  • Observing the creation of electronic Feshbach resonances in soft X-ray–induced O2 dissociation

    2008

  • Temporal characterization of attosecond wave forms in the sub-optical-cycle regime

    2008

  • OPTICS INFOBASE CONFERENCE PAPERS

    2007

  • Direct time resolved observation of molecular dynamics induced by soft-x-ray photoionization

    2007

  • Soft x-ray driven femtosecond dynamics of ionic Rydberg states in N2

    2007

  • Using high-order harmonics with momentum imaging techniques to study atomic and molecular dynamics

    2007

  • Soft X-ray-driven femtosecond molecular dynamics

    2007

  • DIRECT TIME RESOLVED OBSERVATION OF MOLECULAR DYNAMICS INDUCED BY EXTREME-ULTRAVIOLET PHOTOIONIZATION

    2007

  • PART A-RAPID COMMUNICATIONS-Quantum optics, physics of lasers, nonlinear optics-Generation of sub-optical-cycle, carrier-envelope-phase--Insensitive, extreme-uv pulses via …

    2006

  • Real-time study of fast-electron transport inside dense hot plasmas

    2006

  • Diagnosing the dynamics of fast electron transport with self induced magnetic fields

    2006

  • Long-term carrier-envelope phase stability from a grating-based, chirped pulse amplifier

    2006

  • Generation of sub-optical-cycle, carrier-envelope-phase—insensitive, extreme-UV pulses via nonlinear stabilization in a waveguide

    2006

  • Prepulse dependence in hard x‐ray generation from microdroplets

    2006

  • Isolated, CEP-insensitive, EUV Pulses via Gated Phasematching mechanism in a Waveguide

    2006

  • Sub-femtosecond EUV pulses via energy selective nonlinear stabilization in a waveguide

    2006

  • Isolated EUV Pulses via CEP-insensitive Nonlinear Stabilization in a Waveguide

    2006

  • Enhanced hard x-ray emission from microdroplet preplasma

    2006

  • Time resolved evolution of structural, electrical, and thermal properties of copper irradiated by an intense ultrashort laser pulse

    2005

  • Characterization of carrier-envelope phase noise from grating-based stretcher/compressors for chirped-pulse amplification

    2005

  • Long Term Carrier-Envelope Phase Coherence in a Grating-based Chirped Pulse Amplifier System

    2005

  • Laser-pulse-induced second-harmonic and hard x-ray emission: role of plasma-wave breaking

    2005

  • Generation of relativistic electron beam and its anomalous stopping in the fast ignition scheme

    2005

  • Short laser pulse induced generation of hot electrons and their anomalous stopping in overdense plasmas

    2005

  • High-resolution imaging system using a tabletop extreme ultraviolet source

    2004

  • Laser Generated Magnetic Pulses: Hot Electron Propagation in Conducting and Dielectric Material

    2004

  • Controlling coherent and incoherent plasma emissions: the role of electron plasma waves

    2004

  • Investigation of a grating-based stretcher/compressor for carrier-envelope phase stabilized fs pulses

    2004

  • Highly efficient white light generation from barium fluoride

    2004

  • Measurement of two-photon absorption cross-section in organic molecular salt with linear and circular polarized radiation

    2004

  • Advances in multi-photon processes and spectroscopy

    2004

  • Metal nanoplasmas as bright sources of hard x-ray pulses

    2003

  • Ultrashort Magnetic Pulses from Laser-Solid Interaction

    2003

  • Laser-generated ultrashort multimegagauss magnetic pulses in plasmas

    2002

  • Heavy atom effect on nonlinear absorption and optical limiting characteristics of 5, 10, 15, 20-(tetratolyl) porphyrinato phosphorus (V) dichloride

    2002

  • Role of surface roughness in hard-x-ray emission from femtosecond-laser-produced copper plasmas

    2002

  • Photon, electron, atom, and molecule interactions with solids and surfaces-Role of surface roughness in hard-x-ray emission from femtosecond-laser-produced copper plasmas

    2002

  • Modern Perspective on coherent control

    2001

  • Hard x-ray bremsstrahlung from ferntosecond, intense laser produced solid plasmas

    2001

  • Suppression of supercontinuum generation with circularly polarized light

    2000

  • Enhancement Of High-Energy X-Ray Production Using Rough Surfaces

    2000

  • Advances In Multi-photon Processes And Spectroscopy, Vol 13

    2000

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