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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…
Ideal charge density wave order in the high-field state of superconducting YBCO
H. Jang, W. -S. Lee, H. Nojiri +20
The existence of charge density wave (CDW) correlations in cuprate superconductors has now been established. However, the nature of the ground state order has remained uncertain be…
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…
Three-Dimensional Charge Density Wave Order in YBa2Cu3O6.67 at High Magnetic Fields
S. Gerber, H. Jang, H. Nojiri +18
Charge density wave (CDW) correlations have recently been shown to universally exist in cuprate superconductors. However, their nature at high fields inferred from nuclear magnetic…
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…
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…
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…
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$_…
Formation and consequences of heavy d-electron quasiparticles in Sr3Ru2O7
M. P. Allan, A. Tamai, E. Rozbicki +18
We report angle-resolved photoelectron spectroscopy measurements of the quantum critical metal Sr3Ru2O7 revealing itinerant Ru 4d-states confined over large parts of the Brillouin…
Orbital-dependent electron correlation effect on the two- and three-dimensional Fermi surfaces in KFe2As2 revealed by angle-resolved photoemission spectroscopy
T. Yoshida, S. Ideta, I. Nishi +14
We have performed an angle-resolved photoemission study of the hole-overdoped iron pnictide superconductor KFe2As2, which shows a low Tc of ~4 K. Most of the observed Fermi surface…
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…
Subband structure of a two-dimensional electron gas formed at the polar surface of the strong spin-orbit perovskite KTaO
P. D. C. King, R. H. He, T. Eknapakul +13
We demonstrate the formation of a two-dimensional electron gas (2DEG) at the surface of the transition-metal oxide KTaO. From angle-resolved photoemission, we find…
Polaronic metal in lightly doped high-Tc cuprates
A. S. Mishchenko, N. Nagaosa, K. M. Shen +3
We present a combined study of the angle-resolved-photoemission spectroscopy (ARPES) and quantum Monte Carlo simulations to propose a novel polaronic metallic state in underdoped c…
Femtosecond dynamics of the collinear-to-spiral antiferromagnetic phase transition in CuO
S. L. Johnson, R. A. de Souza, U. Staub +22
We report on the ultrafast dynamics of magnetic order in a single crystal of CuO at a temperature of 207 K in response to strong optical excitation using femtosecond resonant x-ray…
Zn-impurity effects on quasi-particle scattering in La2-xSrxCuO4 studied by angle-resolved photoemission spectroscopy
T. Yoshida, Seiki Komiya, X. J. Zhou +7
Angle-resolved photoemission measurements were performed on Zn-doped La2-xSrxCuO4 (LSCO) to investigate the effects of Zn impurities on the low energy electronic structure. The Zn-…
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…
STM imaging of electronic waves on the surface of BiTe: topologically protected surface states and hexagonal warping effects
Zhanybek Alpichshev, J. G. Analytis, J. -H. Chu +5
Scanning tunneling spectroscopy studies on high-quality BiTe crystals exhibit perfect correspondence to ARPES data, hence enabling identification of different regimes measu…
Universal versus Material-Dependent Two-Gap Behaviors in the High-Tc Cuprates: Angle-Resolved Photoemission Study of La2-xSrxCuO4
T. Yoshida, M. Hashimoto, S. Ideta +11
We have investigated the doping and temperature dependences of the pseudogap/superconducting gap in the single-layer cuprate LaSrCuO by angle-resolved photoemission…
Universality of the Electronic Structure from a Half Filled CuO_2 Plane
F. Ronning, C. Kim, K. M. Shen +9
We present angle resolved photoemission (ARPES) data from insulating A_2CuO_2X_2 (A=Sr, Ca; X=Cl, Br), Sr_2Cu_3O_4Cl_2, and Bi_2Sr_2MCu_2O_8 (M=Er, Dy) single crystals which illust…
Nodal metallic behavior of lightly-doped LaSrCuO
T. Yoshida, X. J. Zhou, T. Sasagawa +10
Lightly-doped LaSrCuO in the so-called "insulating" spin-glass/diagonal-stripe phase has been studied by angle-resolved photoemission spectroscopy. A quasi-particle…
Doping dependence of an n-type cuprate superconductor investigated by ARPES
N. P. Armitage, F. Ronning, D. H. Lu +12
We present an angle resolved photoemission (ARPES) doping dependence study of the n-type cuprate superconductor Nd_2-xCe_xCuO_4, from the half-filled Mott-insulator to the T_c=24K…
Momentum-Resolved Inelastic X-ray Scattering as a Novel Tool to Study Charge Gap in Complex Insulators
M. Z. Hasan, E. D. Isaacs, Z-X. Shen +1
We report particle-hole pair excitations in a cuprate insulator in the intermediate regimes of momentum-transfers using high energy inelastic x-ray scattering. The excitation spect…
Angle-resolved photoemission study of insulating and metallic Cu-O chains in PrBaCuO and PrBaCuO
T. Mizokawa, C. Kim, Z. -X. Shen +17
We compare the angle-resolved photoemission spectra of the hole-doped Cu-O chains in PrBaCuO (Pr123) and in PrBaCuO (Pr124). While, in Pr123, a dispersive f…
Angle resolved photoemission spectroscopy of Sr_2CuO_2Cl_2 - a revisit
C. Duerr, S. Legner, R. Hayn +16
We have investigated the lowest binding-energy electronic structure of the model cuprate Sr_2CuO_2Cl_2 using angle resolved photoemission spectroscopy (ARPES). Our data from about…