1k citations · 1.2k across the 27 of their papers we have counts for
28 papers
QuDPy-FDGF: A Python-Based Tool for Computing Ultrafast Nonlinear Optical Responses Using Frequency Domain Green's Functions
Mathieu Desmarais, Simón Paiva-Ortega, Félix Brunell +3
We present QuDPy-FDGF, an open-source Python framework that evaluates Liouville-space pathways as hybrid chains of time propagators and frequency-domain Green's functions. Frequenc…
Collective Excitonic Structure Governs Anomalously Weak Thermal Optical Dephasing in Conjugated Polymers
Henry J. Kantrow, Elizabeth Gutiérrez-Meza, Eric R. Bittner +2
Conjugated polymer aggregates exhibit optical decoherence in the presence of strong vibronic coupling and substantial diversity in chemical structure, solid-state organization, and…
SAKE: Spectral Autodiff Kernel Expansion for Geometric Liouvillian Transport. A Differential-Geometric Framework for Response Transport in Quantum Dynamical Systems
Eric R. Bittner, Carlos Silva-Acuna, Hao Li +1
We introduce the Spectral Autodiff Kernel Expansion (SAKE), a differentiable computational framework for transporting nonlinear spectroscopic response between neighboring quantum d…
State--Generator Geometry of Open Quantum Systems: Compatibility and Covariant Transport
Eric R. Bittner, Carlos Silva-Acuna
We develop a geometry for transporting stationary-state response across the control space of an open quantum system. A physical model is represented by the ordered pair of its stat…
Geometric Response in Open Quantum Systems: Coherence, Curvature, and Susceptibility
Eric R. Bittner, Carlos Silva-Acuña
We develop a response-geometric framework for open quantum systems by decomposing the stationary-state response tensor into symmetric and antisymmetric sectors. The symmetric secto…
Liouvillian Geometry of Multidimensional Spectra: Pathway Transport and Observational Holonomy in Open Quantum Systems
Eric R. Bittner, Carlos Silva-Acuña, Hao Li
Liouville pathways provide the conceptual foundation for interpreting multidimensional spectroscopies and are commonly represented as independent contributions to the nonlinear res…
Detection Defines Dephasing in Two-Dimensional Electronic Spectroscopy of Materials: Coherent Field Emission versus Incoherent Population Observables
Simón Paiva-Ortega, Hao Li, Eric R. Bittner +1
The homogeneous spectral linewidth associated with light-matter interactions is a fundamental descriptor of the optical properties of materials, governed by the quantum dynamics of…
Biexcitons in Ruddlesden-Popper Metal Halides Probed by Nonlinear Coherent Spectroscopy
Katherine A. Koch, Carlos Silva-Acuña, Ajay Ram Srimath Kandada
Excitons and their correlated complexes underpin the rich photophysics of quantum-confined semiconductors. Among these, biexcitons -- bound states of two electrons and two holes --…
Coherent Spectroscopic Probes of Topology: A Velocity-Gauge Perspective
Eric R Bittner, Carlos Silva-Acuna
We present a velocity-gauge formalism for computing nonlinear current response functions in periodic systems and apply it to the Su-Schrieffer-Heeger (SSH) model as a minimal topol…
Spectroscopic signatures of biexcitons: A case study in Ruddlesden-Popper lead-halides
Katherine A. Koch, Esteban Rojas-Gatjens, Martin Gomez-Dominguez +3
Exciton-exciton interactions are fundamental to the light-emitting properties of semiconductors, influencing applications from lasers to quantum light sources. In this study, we in…
Quantum dynamics of photophysical aggregates in conjugated polymers
Henry J. Kantrow, Elizabeth Gutiérrez-Meza, Hongmo Li +7
Photophysical aggregates are ubiquitous in many solid-state microstructures adopted by conjugated polymers, in which electrons interact with those in other polymer chains or th…
A quantum analog of Huygen's clock: noise-induced synchronization
Bhavay Tyagi, Hao Li, Eric R. Bittner +2
We propose a quantum analogue of the Huygens clock, in which the phases of two spins achieve synchronization through their interaction with a shared environment. The environment fu…
Resolving exciton and polariton multi-particle correlations in an optical microcavity in the strong coupling regime
Victoria Quirós-Cordero, Esteban Rojas-Gatjens, Martín Gómez-Dominguez +7
Multi-particle correlations of exciton-polaritons and reservoir-excitons in the strong light-matter coupling regime dictate the quantum dynamics of optical microcavities. In this l…
Unveiling multi-quantum excitonic correlations in push-pull polymer semiconductors
Yulong Zheng, Esteban Rojas-Gatjens, Myeongyeon Lee +2
Bound and unbound Frenkel-exciton pairs are essential transient precursors for a variety of photophysical and biochemical processes. In this work, we identify bound and unbound {Fr…
Exciton-photocarrier interference in mixed lead-halide-perovskite nanocrystals
Esteban Rojas-Gatjens, Quinten A. Akkerman, Liberato Manna +2
The use of semiconductor nanocrystals in scalable quantum technologies requires characterization of the exciton coherence dynamics in an \emph{ensemble} of electronically isolated…
Exciton Bimolecular Annihilation Dynamics in Push-Pull Semiconductor Polymers
Yulong Zheng, Rahul Venkatesh, Esteban Rojas-Gatjens +2
Exciton-exciton annihilation is a ubiquitous nonlinear dynamical phenomenon in materials hosting Frenkel excitons, that has been employed to probe exciton diffusion processes in co…
Many-Exciton Quantum Dynamics in a Ruddlesden-Popper Tin Iodide
Esteban Rojas Gatjens, Hao Li, Alejandro Vega Flick +5
We present a study on the many-body exciton interactions in a prototype Ruddlesden-Popper metal halide (RPMH), namely \ce{(PEA)2SnI4} (PEA = phenylethylammine), using coherent two-…
Resolving nonlinear recombination dynamics in semiconductors via ultrafast excitation correlation spectroscopy: Photoluminescence versus photocurrent detection
Esteban Rojas-Gatjens, Kaila Yallum, Yangwei Shi +7
We explore the application of excitation correlation spectroscopy to detect nonlinear photophysical dynamics in two distinct semiconductor classes through time-integrated photolumi…
Chain Conformation and Exciton Delocalization in a Push-Pull Conjugated Polymer
Yulong Zheng, Rahul Venkatesh, Connor P. Callaway +6
Linear and nonlinear optical lineshapes reveal details of excitonic structure in semiconductor polymers. We implement absorption, photoluminescence, and transient absorption spectr…
Multidimensional coherent spectroscopy of excitons in -conjugated polymers
Elizabeth Gutiérrez-Meza, Alejandro Vega-Flick, Eric R. Bittner +1
The photophysics of -conjugated polymers has been of considerable interest over the last three decades because of their organic semiconductor properties. Primary photoexcitation…
(3-Aminopropyl)trimethoxysilane Surface Passivation Improves Perovskite Solar Cell Performance by Reducing Surface Recombination Velocity
Yangwei Shi, Esteban Rojas-Gatjens, Jian Wang +8
We demonstrate reduced surface recombination velocity (SRV) and enhanced power-conversion efficiency (PCE) in mixed-cation mixed-halide perovskite solar cells by using (3-aminoprop…
Homogeneous optical linewidths in hybrid Ruddlesden-Popper metal halides can only be measured using nonlinear spectroscopy
Ajay Ram Srimath Kandada, Hao Li, Eric R. Bittner +1
The homogeneous photoluminescence spectral linewidth in semiconductors carries a wealth of information on the coupling of primary photoexcitations with their dynamic environment as…
Formation of a highly ordered red phase in a MEH-PPV: polystyrene pseudogels
Elham Rezasoltani, Jaime Martin, Sophia C. Hayes +5
In this work, we demonstrate the formation of a "red-phase" poly[2-methoxy, 5-(2'- ethyl-hexoxy)-1,4-phenylene vinylene-PPV] (MEH-PPV) embedded into a host matrix of highly entangl…
Freezing molecules with light: How long can one maintain a non-equilibrium molecular geometry by strong light-matter coupling?
Eric R. Bittner, Ravyn A. Malatesta, Gabrielle D. Olinger +1
In molecular photochemistry, the non-equilibrium character and subsequent ultrafast relaxation dynamics of photoexcitations near the Franck-Condon region limit the control of their…