Publications (75)
Fidelity Study of Superconductivity in Extended Hubbard Models
N. Plonka, C. J. Jia, Y. Wang +2
The Hubbard model with local on-site repulsion is generally thought to possess a superconducting ground-state for appropriate parameters, but the effects of more realistic long-ran…
Numerically exploring the 1D-2D dimensional crossover on spin dynamics in the doped Hubbard model
Y. F. Kung, C. Bazin, K. Wohlfeld +7
Using determinant quantum Monte Carlo (DQMC) simulations, we systematically study the doping dependence of the crossover from one to two dimensions and its impact on the magnetic p…
Renormalization of spectra by phase competition in the half-filled Hubbard-Holstein model
E. A. Nowadnick, S. Johnston, B. Moritz +1
We present electron and phonon spectral functions calculated from determinant quantum Monte Carlo simulations of the half-filled two-dimensional Hubbard-Holstein model on a square…
Origin of the low critical observing temperature of the quantum anomalous Hall effect in V-doped (Bi, Sb)2Te3 film
W. Li, M. Claassen, Cui-Zu Chang +11
The experimental realization of the quantum anomalous Hall (QAH) effect in magnetically-doped (Bi, Sb)2Te3 films stands out as a landmark of modern condensed matter physics. Howeve…
Distinct Electronic Structure for the Extreme Magnetoresistance in YSb
Junfeng He, Chaofan Zhang, Nirmal J. Ghimire +15
An extreme magnetoresistance (XMR) has recently been observed in several non-magnetic semimetals. Increasing experimental and theoretical evidence indicates that the XMR can be dri…
Effect of dynamical spectral weight redistribution on effective interactions in time-resolved spectroscopy
A. F. Kemper, M. A. Sentef, B. Moritz +2
The redistribution of electrons in an ultrafast pump-probe experiment causes significant changes to the effective interaction between electrons and bosonic modes. We study the infl…
RIXS studies of magnons and bimagnons in the lightly doped cuprate La2-xSrxCuO4
L. Chaix, E. W. Huang, S. Gerber +13
We investigated the doping dependence of magnetic excitations in the lightly doped cuprate La2-xSrxCuO4 via combined studies of resonant inelastic x-ray scattering (RIXS) at the Cu…
Asymmetry of collective excitations in electron and hole doped cuprate superconductors
W. S. Lee, J. J. Lee, E. A. Nowadnick +10
High-temperature superconductivity (HTSC) mysteriously emerges upon doping holes or electrons into insulating copper oxides with antiferromagnetic (AFM) order. It has been thought…
Insights on the cuprate high energy anomaly observed in ARPES
B. Moritz, S. Johnston, T. P. Devereaux
Recently, angle-resolved photoemission spectroscopy has been used to highlight an anomalously large band renormalization at high binding energies in cuprate superconductors: the hi…
Producing Coherent Excitations in Pumped Mott Antiferromagnetic Insulators
Yao Wang, Martin Claassen, B. Moritz +1
Nonequilibrium dynamics in correlated materials has attracted attention due to the possibility of characterizing, tuning, and creating complex ordered states. To understand the pho…
Electronic structure of the quadrupolar ordered heavy-fermion compound YbRu2Ge2 measured by angle-resolved photoemission
H. Pfau, E. W. Rosenberg, P. Massat +5
We studied the electronic structure of the heavy fermion compound Yb(RuRh)Ge with and nominally using ARPES and LDA calculations. We find a va…
Amplitude mode oscillations in pump-probe photoemission spectra from a d-wave superconductor
B. Nosarzewski, B. Moritz, J. K. Freericks +2
Recent developments in the techniques of ultrafast pump-probe photoemission have made possible the search for collective modes in strongly correlated systems out of equilibrium. In…
Real-time manifestation of strongly coupled spin and charge order parameters in stripe-ordered nickelates via time-resolved resonant x-ray diffraction
Y. D. Chuang, W. S. Lee, Y. F. Kung +27
We investigate the order parameter dynamics of the stripe-ordered nickelate, LaSrNiO, using time-resolved resonant X-ray diffraction. In spite of distinct spi…
Superconductivity, Charge-Density-Waves, and Bipolarons in the Holstein model
B. Nosarzewski, E. W. Huang, Philip M. Dee +5
The electron-phonon (e-ph) interaction remains of great interest in condensed matter physics and plays a vital role in realizing superconductors, charge-density-waves (CDW), and po…
Direct observation of bulk charge modulations in optimally-doped BiPbSrCaCuO
M. Hashimoto, G. Ghiringhelli, W. -S. Lee +12
Bulk charge density modulations, recently observed in high critical-temperature () cuprate superconductors, coexist with the so-called pseudogap and compete with supe…
Numerical exploration of spontaneous broken symmetries in multi-orbital Hubbard models
Y. F. Kung, C. -C. Chen, B. Moritz +3
We study three proposals for broken symmetry in the cuprate pseudogap - oxygen antiferromagnetism, orbital loop currents, and circulating currents involving apex oxygens…
Web-Based Methods for X-ray and Photoelectron Spectroscopies
T. P. Devereaux, B. Moritz, C. Jia +2
We present a simplified web-based application for simulating x-ray and photoelectron spectra of transition metals, built around the notion that web-based applications lower the bar…
Temporal response of nonequilibrium correlated electrons
B. Moritz, T. P. Devereaux, J. K. Freericks
In this work we examine the time-resolved, instantaneous current response for the spinless Falicov-Kimball model at half-filling, on both sides of the Mott-Hubbard metal-insulator…
A Systematic Study of Electron-Phonon Coupling to Oxygen Modes Across the Cuprates
S. Johnston, F. Vernay, B. Moritz +4
The large variations of T across the cuprate families is one of the major unsolved puzzles in condensed matter physics, and is poorly understood. Although there appears to be a…
Theory of pump-probe photoemission in graphene: Ultrafast tuning of Floquet bands and local pseudospin textures
M. A. Sentef, M. Claassen, A. F. Kemper +4
The control of physical properties of solids with short laser pulses is an intriguing prospect of ultrafast materials science. Continuous-wave high-frequency laser driving with cir…
Doping-dependent nodal Fermi velocity in Bi-2212 revealed by high-resolution ARPES
I. M. Vishik, W. S. Lee, F. Schmitt +8
The improved resolution of laser-based angle-resolved photoemission spectroscopy (ARPES) allows reliable access to fine structures in the spectrum. We present a systematic, doping-…
Competition between antiferromagnetic and charge density wave order in the half filled Hubbard-Holstein model
E. A. Nowadnick, S. Johnston, B. Moritz +2
We present a determinant quantum Monte Carlo study of the competition between instantaneous on-site Coulomb repulsion and retarded phonon-mediated attraction between electrons, as…
Paradeisos: a perfect hashing algorithm for many-body eigenvalue problems
C. J. Jia, Y. Wang, C. B. Mendl +2
We describe an essentially perfect hashing algorithm for calculating the position of an element in an ordered list, appropriate for the construction and manipulation of many-body H…
Review of the theoretical description of time-resolved angle-resolved photoemission spectroscopy in electron-phonon mediated superconductors
A. F. Kemper, M. A. Sentef, B. Moritz +2
We review recent work on the theory for pump/probe photoemission spectroscopy of electron-phonon mediated superconductors in both the normal and the superconducting states. We desc…
Determinant quantum Monte Carlo study of the two-dimensional single-band Hubbard-Holstein model
S. Johnston, E. A. Nowadnick, Y. F. Kung +3
We have performed numerical studies of the Hubbard-Holstein model in two dimensions using determinant quantum Monte Carlo (DQMC). Here we present details of the method, emphasizing…
Phase Fluctuations and the Absence of Topological Defects in Photo-excited Charge Ordered Nickelate
W. S. Lee, Y. D. Chuang, R. G. Moore +32
The dynamics of an order parameter's amplitude and phase determines the collective behaviour of novel states emerged in complex materials. Time- and momentum-resolved pump-probe sp…
A balancing act: Evidence for a strong subdominant d-wave pairing channel in
T. Böhm, A. F. Kemper, B. Moritz +7
We present an analysis of the Raman spectra of optimally doped based on LDA band structure calculations and the subsequent estimation of effective R…
Persistent spin excitations in doped antiferromagnets revealed by resonant inelastic light scattering
C. J. Jia, E. A. Nowadnick, K. Wohlfeld +6
How coherent quasiparticles emerge by doping quantum antiferromagnets is a key question in correlated electron systems, whose resolution is needed to elucidate the phase diagram of…
A momentum-dependent perspective on quasiparticle interference in Bi_{2}Sr_{2}CaCu_{2}O_{8+δ}
I. M. Vishik, B. Moritz, E. A. Nowadnick +6
Angle Resolved Photoemission Spectroscopy (ARPES) probes the momentum-space electronic structure of materials, and provides invaluable information about the high-temperature superc…
Unraveling the Nature of Charge Excitations in LaCuO with Momentum-Resolved Cu -edge Resonant Inelastic X-ray Scattering
C. -C. Chen, B. Moritz, F. Vernay +8
Results of model calculations using exact diagonalization reveal the orbital character of states associated with different Raman loss peaks in Cu -edge resonant inelastic X-ray…
Spectroscopic Evidence for Charge Order Melting via Quantum Fluctuations in a Cuprate
W. S. Lee, K. J. Zhou, M. Hepting +14
Copper-oxide high TC superconductors possess a number of exotic orders co-existing with or proximal to superconductivity, whose quantum fluctuations may account for the unusual beh…
Doping evolution of spin and charge excitations in the Hubbard model
Y. F. Kung, E. A. Nowadnick, C. J. Jia +4
To shed light on how electronic correlations vary across the phase diagram of the cuprate superconductors, we examine the doping evolution of spin and charge excitations in the sin…
Correlation tuned cross-over between thermal and nonthermal states following ultrafast transient pumping
B. Moritz, A. F. Kemper, M. Sentef +2
We examine electron-electron mediated relaxation following excitation of a correlated system by an ultrafast electric field pump pulse. The results reveal a dichotomy in the tempor…
Three dimensional collective charge excitations in electron-doped cuprate superconductors
M. Hepting, L. Chaix, E. W. Huang +17
High temperature cuprate superconductors consist of stacked CuO2 planes, with primarily two dimensional electronic band structures and magnetic excitations, while superconducting c…
Quasiparticle interference and the interplay between superconductivity and density wave order in the cuprates
E. A. Nowadnick, B. Moritz, T. P. Devereaux
Scanning tunneling spectroscopy (STS) is a useful probe for studying the cuprates in the superconducting and pseudogap states. Here we present a theoretical study of the Z-map, def…
Revealing the Coulomb interaction strength in a cuprate superconductor
S. -L. Yang, J. A. Sobota, Y. He +10
We study optimally doped BiSrCaYCuO (Bi2212) using angle-resolved two-photon photoemission spectroscopy. Three spectral features are re…
Symmetry breaking orbital anisotropy on detwinned Ba(Fe1-xCox)2As2 above the spin density wave transition
M. Yi, D. H. Lu, J. -H. Chu +12
Nematicity, defined as broken rotational symmetry, has recently been observed in competing phases proximate to the superconducting phase in the cuprate high temperature superconduc…
Fermi surface reconstruction in electron-doped cuprates without antiferromagnetic long-range order
J. -F. He, C. R. Rotundu, M. S. Scheurer +12
Fermi surface (FS) topology is a fundamental property of metals and superconductors. In electron-doped cuprate Nd2-xCexCuO4 (NCCO), an unexpected FS reconstruction has been observe…
Electronic structure of the parent compound of superconducting infinite-layer nickelates
M. Hepting, D. Li, C. J. Jia +22
The search for oxide materials with physical properties similar to the cuprate high Tc superconductors, but based on alternative transition metals such as nickel, has grown and evo…
Tailoring the nature and strength of electron-phonon interactions in the SrTiO(001) two-dimensional electron liquid
Z. Wang, S. McKeown Walker, A. Tamai +20
Surfaces and interfaces offer new possibilities for tailoring the many-body interactions that dominate the electrical and thermal properties of transition metal oxides. Here, we us…
Direct characterization of photo-induced lattice dynamics in BaFe2As2
S. Gerber, K. W. Kim, Y. Zhang +21
Ultrafast light pulses can modify the electronic properties of quantum materials by perturbing the underlying, intertwined degrees of freedom. In particular, iron-based superconduc…
Time-resolved photoemission of correlated electrons driven out of equilibrium
B. Moritz, T. P. Devereaux, J. K. Freericks
We describe the temporal evolution of the time-resolved photoemission response of the spinless Falicov-Kimball model driven out of equilibrium by strong applied fields. The model i…
Material and doping dependence of the nodal and anti-nodal dispersion renormalizations in single- and multi-layer cuprates
S. Johnston, W. S. Lee, Y. Chen +4
In this paper we present a review of bosonic renormalization effects on electronic carriers observed from angle-resolved photoemission spectra in the cuprates. We specifically disc…
Orbital Order and Spontaneous Orthorhombicity in Iron Pnictides
C. -C. Chen, J. Maciejko, A. P. Sorini +3
A growing list of experiments show orthorhombic electronic anisotropy in the iron pnictides, in some cases at temperatures well above the spin density wave transition. These experi…
Evidence for weak electronic correlations in Fe-pnictides
W. L. Yang, P. O. Velasco, J. D. Denlinger +17
Using x-ray absorption and resonant inelastic x-ray scattering, charge dynamics at and near the Fe edges is investigated in Fe pnictide materials, and contrasted to that measur…
Chiral electronic excitations and strong electron-phonon coupling to Weyl fermions in the Kagome semimetal CoSnS
G. He, M. Kute, Z. C. Xu +10
We present results of a Raman scattering study of the Kagome ferromagnet CoSnS, with a focus on electronic and phononic excitations and their interplay. We provide a th…
Strong energy-momentum dispersion of phonon-dressed carriers in the lightly doped band insulator SrTiO
W. Meevasana, X. J. Zhou, B. Moritz +12
Much progress has been made recently in the study of the effects of electron-phonon (el-ph) coupling in doped insulators using angle resolved photoemission (ARPES), yielding eviden…
Pressure Effects on the 4f Electronic Structure of Light Lanthanides
W. -T. Chiu, D. R. Mortensen, M. J. Lipp +7
Using the satellite structure of the line in non-resonant x-ray emission spectra, we probe the high-pressure evolution of the bare 4f signature of the early light lan…
The Role of Lattice Coupling in Establishing Electronic and Magnetic Properties in Quasi-One-Dimensional Cuprates
W. S. Lee, S. Johnston, B. Moritz +11
High resolution resonant inelastic x-ray scattering has been performed to reveal the role of lattice-coupling in a family of quasi-1D insulating cuprates, CaYCu$_…
Time-Dependent Charge-Order and Spin-Order Recovery in Striped Systems
Y. F. Kung, W. -S. Lee, C. -C. Chen +4
Using time-dependent Ginzburg-Landau theory, we study the role of amplitude and phase fluctuations in the recovery of charge and spin stripe phases in response to a pump pulse that…
Magnetic excitations in infinite-layer nickelates
H. Lu, M. Rossi, A. Nag +14
The discovery of superconductivity in infinite-layer nickelates brings us tantalizingly close to a new material class that mirrors the cuprate superconductors. Here, we report on m…
Uncovering selective excitations using the resonant profile of indirect inelastic x-ray scattering in correlated materials: Observing two-magnon scattering and relation to the dynamical structure factor
C. J. Jia, C. -C. Chen, A. P. Sorini +2
Resonant inelastic x-ray scattering (RIXS) is a spectroscopic technique which has been widely used to study various elementary excitations in correlated and other condensed matter…
Dynamic competition between spin density wave order and superconductivity in underdoped
M. Yi, Y. Zhang, Z. -K. Liu +13
An intriguing aspect of unconventional superconductivity is that it always appears in the vicinity of other competing phases, whose suppression brings the full emergence of superco…
Directly characterizing the relative strength and momentum dependence of electron-phonon coupling using resonant inelastic x-ray scattering
T. P. Devereaux, A. M. Shvaika, K. Wu +9
The coupling between lattice and charge degrees of freedom in condensed matter materials is ubiquitous and can often result in interesting properties and ordered phases, including…
Light-Enhanced Spin Fluctuations and d-Wave Superconductivity at a Phase Boundary
Yao Wang, Cheng-Chien Chen, B. Moritz +1
Time-domain techniques have shown the potential of photo-manipulating existing orders and inducing new states of matter in strongly correlated materials. Using time-resolved exact…
Doping Evolution of Oxygen K-edge X-ray Absorption Spectra in Cuprate Superconductors
C. -C. Chen, M. Sentef, Y. F. Kung +5
We study oxygen K-edge x-ray absorption spectroscopy (XAS) and investigate the validity of the Zhang-Rice singlet (ZRS) picture in overdoped cuprate superconductors. Using large-sc…
Orbital and Spin Character of Doped Carriers in Infinite-Layer Nickelates
M. Rossi, H. Lu, A. Nag +13
The recent discovery of superconductivity in NdSrNiO has drawn significant attention in the field. A key open question regards the evolution of the electronic str…
Resonant Enhancement of Charge Density Wave Diffraction in the Rare-Earth Tritellurides
W. S. Lee, A. P. Sorini, M. Yi +10
We performed resonant soft X-ray diffraction on known charge density wave (CDW) compounds, rare earth tri-tellurides. Near the (3d - 4f) absorption edge of rare earth ions, a…
Mapping of the unoccupied states and relevant bosonic modes via the time dependent momentum distribution
A. F. Kemper, M. Sentef, B. Moritz +4
The unoccupied states of complex materials are difficult to measure, yet play a key role in determining their properties. We propose a technique that can measure the unoccupied sta…
Direct observation of Higgs mode oscillations in the pump-probe photoemission spectra of electron-phonon mediated superconductors
A. F. Kemper, M. A. Sentef, B. Moritz +2
Using the non-equilibrium Keldysh formalism, we solve the equations of motion for electron-phonon superconductivity, including an ultrafast pump field. We present results for time-…
Effect of strong correlations on the high energy anomaly in hole- and electron-doped high-Tc superconductors
B. Moritz, F. Schmitt, W. Meevasana +8
Recently, angle-resolved photoemission spectroscopy (ARPES) has been used to highlight an anomalously large band renormalization at high binding energies in cuprate superconductors…
Charge Density Wave Driven Ferromagnetism in the Periodic Anderson Model
M. A. Majidi, D. G. S. P. Doluweera, B. Moritz +3
We demonstrate the existence of ferromagnetism in the Periodic Anderson Model (PAM) at conduction-band filling near a quarter. We show that this ferromagnetism is not supported by…
Raman and fluorescence characteristics of resonant inelastic X-ray scattering from doped superconducting cuprates
H. Y. Huang, C. J. Jia, Z. Y. Chen +14
Measurements of spin excitations are essential for an understanding of spin-mediated pairing for superconductivity; and resonant inelastic X-ray scattering (RIXS) provides a consid…
An Investigation of Particle-Hole Asymmetry in the Cuprates via Electronic Raman Scattering
B. Moritz, S. Johnston, T. P. Devereaux +7
In this paper we examine the effects of electron-hole asymmetry as a consequence of strong correlations on the electronic Raman scattering in the normal state of copper oxide high…
Universal orbital and magnetic structures in infinite-layer nickelates
M. Rossi, H. Lu, K. Lee +17
We conducted a comparative study of the rare-earth infinite-layer nickelates films, RNiO2 (R = La, Pr, and Nd) using resonant inelastic X-ray scattering (RIXS). We found that the g…
Theoretical description of high-order harmonic generation in solids
A. F. Kemper, B. Moritz, J. K. Freericks +1
We consider several aspects of high-order harmonic generation in solids: the effects of elastic and inelastic scattering; varying pulse characteristics; and inclusion of material-s…
Cu -edge Resonant Inelastic X-Ray Scattering in Edge-Sharing Cuprates
F. Vernay, B. Moritz, I. Elfimov +4
We present calculations for resonant inelastic x-ray scattering (RIXS) in edge-shared copper oxide systems, such as CuGeO and LiCuO, appropriate for hard x-ray sc…
Intertwined states at finite temperatures in the Hubbard model
E. W. Huang, W. O. Wang, J. K. Ding +5
Significant advances in numerical techniques have enabled recent breakthroughs in the study of various properties of the Hubbard model - a seemingly simple, yet complex model of co…
A Fidelity Study of the Superconducting Phase Diagram in the 2D Single-band Hubbard Model
C. J. Jia, B. Moritz, C. -C. Chen +2
Extensive numerical studies have demonstrated that the two-dimensional single-band Hubbard model contains much of the key physics in cuprate high-temperature superconductors. Howev…
Characterizing the three-orbital Hubbard model with determinant quantum Monte Carlo
Y. F. Kung, C. -C. Chen, Yao Wang +6
We characterize the three-orbital Hubbard model using state-of-the-art determinant quantum Monte Carlo (DQMC) simulations with parameters relevant to the cuprate high-temperature s…
Charge-orbital-lattice coupling effects in the dd-excitation profile of one dimensional cuprates
J. J. Lee, B. Moritz, W. S. Lee +12
We identify dd-excitations in the quasi-one dimensional compound CaYCuO using resonant inelastic x-ray scattering. By tuning across the Cu L-edge, we observe…
Finite temperature spin-dynamics and phase transitions in spin-orbital models
C. -C. Chen, B. Moritz, J. van den Brink +2
We study finite temperature properties of a generic spin-orbital model relevant to transition metal compounds, having coupled quantum Heisenberg-spin and Ising-orbital degrees of f…
Dispersion, damping, and intensity of spin excitations in the single-layer (Bi,Pb)(Sr,La)CuO cuprate superconductor family
Y. Y. Peng, E. W. Huang, R. Fumagalli +11
Using Cu- edge resonant inelastic x-ray scattering (RIXS) we measured the dispersion and damping of spin excitations (magnons and paramagnons) in the high- super…
On the Question of Coincidence Between Energy Gaps and Kohn Anomalies
S. Johnston, A. P. Sorini, B. Moritz +2
Recently, neutron scattering spin echo measurements have provided high resolution data on the temperature dependence of the linewidth of acoustic phonons in convent…
Revealing the degree of magnetic frustration by non-magnetic impurities
C. -C. Chen, R. Applegate, B. Moritz +2
Imaging the magnetic fields around a non-magnetic impurity can provide a clear benchmark for quantifying the degree of magnetic frustration. Focusing on the strongly frustrated $J_…