A5044238967- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Black Holes and Theoretical Physics
- Quantum and electron transport phenomena
- Quantum many-body systems
- Physics of Superconductivity and Magnetism
- Nuclear physics research studies
- Atomic and Subatomic Physics Research
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Advanced NMR Techniques and Applications
- Superconducting Materials and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Numerical methods for differential equations
- Theoretical and Computational Physics
- Quantum, superfluid, helium dynamics
- Nonlinear Photonic Systems
- Quantum Computing Algorithms and Architecture
- Particle Detector Development and Performance
- advanced mathematical theories
- Organic and Molecular Conductors Research
- Spectroscopy and Quantum Chemical Studies
- Particle Accelerators and Free-Electron Lasers
- Medical Imaging Techniques and Applications
Flatiron Health (United States)
2023-2025
Flatiron Institute
2023-2025
Columbia University
2017-2021
Johannes Gutenberg University Mainz
2013-2020
University of Perugia
2014-2018
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2018
Boğaziçi University
2016-2017
University of Turin
2017
Institute of High Energy Physics
2014-2017
Goethe University Frankfurt
2017
Singlet fission, a multistep molecular process in which one photon generates two triplet excitons, holds great technological promise. Here, by applying combination of transient transmittance and two-dimensional electronic spectroscopy with 5 fs laser pulses, we resolve the full set fission steps before onset spin dephasing. In addition to its role as viable singlet material, single-crystalline rubrene is selected because energetics transition dipole alignment uniquely allow for unambiguous...
We study the applicability of time-dependent variational principle in matrix-product state manifolds for long time description quantum interacting systems. By studying integrable and nonintegrable systems which dynamics are known we demonstrate that convergence observables is subtle needs to be examined carefully. Remarkably, disordered system consider good agreement with rigorously obtained short behavior previous numerically exact results, suggesting at least this case, apparent approach...
The numbers of $\psi(3686)$ events accumulated by the BESIII detector for two rounds data taking during 2009 and 2012 are determined to be $(107.0\pm0.8)\times 10^6$ $(341.1\pm 2.1)\times 10^6$, respectively, counting inclusive hadronic events, where uncertainty is dominated systematics statistical negligible. number sample taken in consistent with that previous measurement. total data-taking periods $(448.1\pm2.9)\times10^6$.
We show that the dynamics of (vertical) Franck-Condon excitations in regime where Holstein-coupled vibrational modes mix strongly with electronic degrees freedom sharply contrasts known self-localized behavior vibrationally relaxed excitations. Instead, coupled are found to periodically induce resonances between interacting sites, during which effective excitation transfer occurs, allowing attain substantial mean square displacements under conditions essentially trapped a single site. In...
The non-equilibrium dynamics of matter excited by light may produce electronic phases that do not exist in equilibrium, such as laser-induced high-transition-temperature superconductivity. Here we simulate the a metal driven at initial time $t=0$ spatially uniform pump excites dipole-active vibrational modes which couple quadratically to electrons. We study detail evolution and observables their coherences. provide evidence for enhancement local correlations, including double occupancy,...
In the $0+1$ -dimensional imaginary-time path integral formulation of quantum impurity problems, retarded action encodes hybridization with bath. this article, we explore computational power representing as matrix product state (RAMPS). We focus on challenging Kondo regime single-impurity Anderson model, where nonperturbative strong-correlation effects arise at very low energy scales. demonstrate that RAMPS approach reliably reaches for a range interaction strengths $U$, numerical error...
Tensor network quantum states are powerful tools for strongly correlated systems, tailored to capture local correlations such as in ground with entanglement area laws. When applying tensor interacting fermionic a proper choice of the basis or orbitals can reduce bond dimension tensors and provide physically relevant orbitals. We introduce change unitary gates obtained from compressing Gaussian into circuits corresponding various networks. These ground-state entropy improve performance...
The phenomena of superconductivity and charge density waves are observed in close vicinity many strongly correlated materials. Increasing evidence from experiments numerical simulations suggests both can also occur an intertwined manner, where the superconducting order parameter is coupled to electronic density. Employing matrix renormalization group simulations, we investigate nature such state matter stabilized phase diagram elementary $$t-{t}^{{\prime} }-U$$ Hubbard model strong coupling...
The variational equations of motion the multi-configuration time-dependent Hartree (MCTDH) approach contain inverse reduced density matrices which are typically ill-conditioned and therefore lead to small stepsizes for numerical time integration. This problem is usually dealt with via regularization matrices, works well in many cases but still calls systematic improvement schemes. Recently this problem, its implications possible solutions have become subject increased interest. Notably, a...
We analyze and discuss convergence properties of a numerically exact algorithm tailored to study the dynamics interacting two-dimensional lattice systems. The method is based on application time-dependent variational principle in manifold binary quaternary Tree Tensor Network States. approach found be competitive with existing matrix product state approaches. issues related method, which could relevant broader set numerical techniques used for
We numerically study spin transport and nonequilibrium spin-density profiles in a clean one-dimensional spin-chain with long-range interactions, decaying as power-law,$r^{-\alpha}$ distance. find two distinct regimes of transport: for $\alpha<1/2$, excitations relax instantaneously the thermodynamic limit, $\alpha>1/2$, combines both diffusive superdiffusive features. show that while $\alpha>3/2$ diffusion coefficient is finite, system never strictly diffusive, contrary to corresponding...
Novel paradigms of strong ergodicity breaking have recently attracted significant attention in condensed matter physics. Understanding the exact conditions required for their emergence or breakdown not only sheds more light on thermalization and its absence closed quantum many-body systems, but it also has potential benefits applications information technology. A case particular interest is localization whose are yet fully settled. Here, we prove that spin chains symmetric under a...
We explore the nonequilibrium dynamics of a one-dimensional Fermi-Hubbard system as sensitive testbed for capabilities time-dependent two-particle reduced density matrix (TD2RDM) theory to accurately describe correlated systems. follow time evolution out-of-equilibrium finite-size model initialized by quench over extended periods time. By comparison with exact calculations small systems and product state larger but limited short times, we demonstrate that TD2RDM can account in regime from...
Using a numerically exact technique we study spin transport and the evolution of spin-density excitation profiles in disordered spin-chain with long-range interactions, decaying as power-law, $r^{-\alpha}$ distance $\alpha<2$. Our confirms prediction recent theories that system is delocalized this parameters regime. Moreover find for $\alpha>3/2$ underlying diffusive transient super-diffusive tail, similarly to situation clean systems. We generalize Griffiths picture systems show it captures...
We present a theoretical study of Aun-dithienylethene hybrid systems (n = 3, 19, 25), where the organic molecule is covalently linked to nanometer-scaled gold nanoparticle (NP). aim at gaining insights on optical properties such photochromic devices and proposing size-limited aggregate model able recover experimental system. thus DFT-based calculation scheme ground-state (conformation, energetic parameters) excited-state (UV-visible absorption spectra) this type systems. Within framework,...
We derive a family of equations-of-motion (EOMs) for evolving multi-layer multiconfiguration time-dependent Hartree (ML-MCTDH) wavefunctions that, unlike the standard ML-MCTDH EOMs, never require evaluation inverse singular matrices. All members this EOMs make use alternative static gauge conditions than those used ML-MCTDH. These result in an expansion wavefunction terms set potentially arbitrary orthonormal functions, rather non-orthonormal and linearly dependent as is case show that...
The multi-layer multi-configuration time-dependent Hartree (ML-MCTDH) approach can suffer from numerical instabilities whenever the wavefunction is weakly entangled. These arise singularities in equations of motion (EOMs) and necessitate use regularization EOMs. Projector Splitting Integrator (PSI) has previously been presented as an for evolving ML-MCTDH wavefunctions that free singularities. Here, we will discuss implementation PSI with a particular focus on how steps required relate to...
The mini-proceedings of the Workshop on "Constraining hadronic contributions to muon anomalous magnetic moment" which included "13th meeting Radio MonteCarLow WG" and "Satellite R-Measurements at BES-III" held in Trento from April 10th 12th, 2013, are presented. This collaboration aims bring together experimental e+e- collider communities BaBar, Belle, BESIII, CMD2, KLOE, SND, with theorists working fields meson transitions form factors, (g-2)_μand effective fine structure constant,...
In the $0+1$ dimensional imaginary-time path integral formulation of quantum impurity problems, retarded action encodes hybridization with bath. this Article, we explore computational power representing as matrix product state (RAMPS). We focus on challenging Kondo regime single-impurity Anderson model, where non-perturbative strong-correlation effects arise at very low energy scales. demonstrate that RAMPS approach reliably reaches for a range interaction strengths $U$, numerical error...