Publications (58)
Indirect Probes of New Physics
J. L. Hewett, T. Takeuchi, S. Thomas
We summarize the indirect effects of new physics in a variety of processes. We consider precision electroweak measurements, the of the muon, rare decays, meson mixing, CP vio…
Surface Structures of Epitaxial B20 FeGe(-1-1-1) Thin Films via Scanning Tunneling Microscopy
J. P. Corbett, T. Zhu, A. S. Ahmed +5
We grew 20-100 nm thick films of B20 FeGe by molecular beam epitaxy and investigated the surface structures via scanning tunneling microscopy. We observed the atomic resolution of…
Evidence for suppressed metallicity on the surface of La2-xSrxCuO4 and Nd2-xCexCuO4
M. Taguchi, A. Chainani, K. Horiba +19
Hard X-ray Photoemission spectroscopy (PES) of copper core electronic states, with a probing depth of 60 Ã , is used to show that the Zhang-Rice singlet feature is present in…
Discovery of Small-Scale Spiral Structures in the Disk of SAO 206462 (HD 135344B): Implications for the Physical State of the Disk from Spiral Density Wave Theory
T. Muto, C. A. Grady, J. Hashimoto +59
We present high-resolution, H-band, imaging observations, collected with Subaru/HiCIAO, of the scattered light from the transitional disk around SAO 206462 (HD 135344B). Although p…
Charge density wave origin of cuprate checkerboard visualized by scanning tunneling microscopy
W. D. Wise, M. C. Boyer, Kamalesh Chatterjee +5
One of the main challenges in understanding high TC superconductivity is to disentangle the rich variety of states of matter that may coexist, cooperate, or compete with d-wave sup…
Incoherent transport across the strange metal regime of highly overdoped cuprates
J. Ayres, M. Berben, M. Culo +11
Strange metals possess highly unconventional transport characteristics, such as a linear-in-temperature () resistivity, an inverse Hall angle that varies as and a linear-i…
Theory of Neutrinos
R. N. Mohapatra, S. Antusch, K. S. Babu +29
After a brief overview of the present knowledge of neutrino masses and mixing, we summarize what can be learned about physics beyond the standard model from the various proposed ne…
Evidence for a correlated insulator to antiferromagnetic metal transition in CrN
P. A. Bhobe, A. Chainani, M. Taguchi +15
We investigate the electronic structure of Chromium Nitride (CrN) across the first-order magneto-structural transition at T_N ~ 286 K. Resonant photoemission spectroscopy shows a g…
Multiband Superconductivity in Heavy Fermion Compound CePt3Si without Inversion Symmetry: An NMR Study on a High-Quality Single Crystal
H. Mukuda, S. Nishide, A. Harada +11
We report on novel superconducting characteristics of the heavy fermion (HF) superconductor CePt3Si without inversion symmetry through 195Pt-NMR study on a single crystal with T_c=…
The influence of out-of-plane disorder on the formation of pseudogap and Fermi arc in Bi2Sr2-xRxCuOy (R=La and Eu)
Y. Okada, T. Takeuchi, A. Shimoyamada +2
We found that the length of the Fermi arc decreases with increasing out-of-plane disorder by performing angle resolved photoemission spectroscopy (ARPES) measurements in the superc…
Metallicities of Classical Cepheids in the Inner Galactic Disk
N. Matsunaga, D. Taniguchi, S. S. Elgueta +14
Metallicity gradients refer to the sloped radial profile of metallicities of gas and stars and are commonly seen in disk galaxies. A well-defined metallicity gradient of the Galact…
An evaluation of the analytic continuation by duality technique
T. Takeuchi, L. C. Goonetileke, S. R. Ignjatovic +1
In Nucl. Phys. B391 (1993) 127, the value of the oblique correction parameter S for walking technicolor theories was estimated using a technique called Analytic Continuation by Dua…
Light Sterile Neutrinos: A White Paper
K. N. Abazajian, M. A. Acero, S. K. Agarwalla +184
This white paper addresses the hypothesis of light sterile neutrinos based on recent anomalies observed in neutrino experiments and the latest astrophysical data.
Dynamical symmetry breaking under core excitation in graphite: Polarization correlation in soft X-ray recombination emission
Y. Harada, T. Tokushima, Y. Takata +5
A recombination emission spectrum is applied to study the local lattice distortion due to core excitation in graphite. The recombination emission spectrum reveals a long low-energy…
Spontaneous magnetic field and disorder effects in BaPtAs_1-x_Sb_x_ with honeycomb network
T. Adachi, T. Ogawa, Y. Komiyama +21
Chiral superconductivity exhibits the formation of novel electron pairs that breaks the time-reversal symmetry and has been actively studied in various quantum materials in recent…
Longitudinal SDW order in a quasi-1D Ising-like quantum antiferromagnet
S. Kimura, M. Matsuda, T. Masuda +10
From neutron diffraction measurements on a quasi-1D Ising-like Co spin compound BaCoVO, we observed an appearance of a novel type of incomm…
The minimum value function for the Tikhonov regularization and its applications
K. Ito, T. Takeuchi
The minimum value function appearing in Tikhonov regularization technique is very useful in determining the regularization parameter, both theoretically and numerically. In this pa…
Effect of magnetic field in heavy-fermion compound YbCoZn
K. Kaneko, S. Yoshiuchi, T. Takeuchi +3
Inelastic neutron scattering experiments on poly crystalline sample of heavy-fermion compound YbCoZn were carried out in order to obtain microscopic insights on the grou…
Electronic Spectra and Their Relation to the (pi,pi) Collective Mode in High-Tc Superconductors
J. C. Campuzano, H. Ding, M. R. Norman +15
Photoemission spectra of Bi2Sr2CaCu2O8 reveal that the high energy feature near (pi,0), the "hump", scales with the superconducting gap and persists above Tc in the pseudogap phase…
Destruction of the Fermi Surface in Underdoped High Tc Superconductors
M. R. Norman, H. Ding, M. Randeria +8
The Fermi surface is a central concept in the theory of metals. Even though the optimally doped high temperature superconductors exhibit an anomalous normal state, angle resolved p…
High-Resolution Near-Infrared Polarimetry of a Circumstellar Disk around UX Tau A
Ryoko Tanii, Yoichi Itoh, Tomoyuki Kudo +65
We present H-band polarimetric imagery of UX Tau A taken with HiCIAO/AO188 on the Subaru Telescope. UX Tau A has been classified as a pre-transitional disk object, with a gap struc…
Imaging the Two Gaps of the High-TC Superconductor Pb-Bi2Sr2CuO6+x
M. C. Boyer, W. D. Wise, Kamalesh Chatterjee +5
The nature of the pseudogap state, observed above the superconducting transition temperature TC in many high temperature superconductors, is the center of much debate. Recently, th…
Recoil Effect of Photoelectrons in the Fermi-Edge of Simple Metals
Y. Takata, Y. Kayanuma, S. Oshima +13
High energy resolution photoelectron spectroscopy of conduction electrons in the vicinity of the Fermi-edge in Al and Au at the excitation energy of 880 and 7940 eV was carried out…
The Herschel ATLAS
S. Eales, L. Dunne, D. Clements +94
The Herschel ATLAS is the largest open-time key project that will be carried out on the Herschel Space Observatory. It will survey 510 square degrees of the extragalactic sky, four…
Theory of Neutrinos: A White Paper
R. N. Mohapatra, S. Antusch, K. S. Babu +29
During 2004, four divisions of the American Physical Society commissioned a study of neutrino physics to take stock of where the field is at the moment and where it is going in the…
Probing electronic order via coupling to low energy phonons in superconducting BiSrLaCuO
C. J. Bonnoit, D. R. Gardner, R. Chisnell +7
We report high-resolution inelastic x-ray scattering measurements of the acoustic phonons in the single-layer cuprate $Bi_{2}Sr_{2-x)La_{x}CuO_{6+δ}$. These measurements reveal an…
Terascale Physics Opportunities at a High Statistics, High Energy Neutrino Scattering Experiment: NuSOnG
T. Adams, P. Batra, L. Bugel +33
This article presents the physics case for a new high-energy, ultra-high statistics neutrino scattering experiment, NuSOnG (Neutrino Scattering on Glass). This experiment uses a Te…
The globular cluster VVV CL002 falling down to the hazardous Galactic centre
D. Minniti, N. Matsunaga, J. G. Fernandez-Trincado +15
Context. The Galactic centre is hazardous for stellar clusters because of the strong tidal force. Supposedly, many clusters were destroyed and contributed stars to the crowded stel…
QCD Precision Measurements and Structure Function Extraction at a High Statistics, High Energy Neutrino Scattering Experiment: NuSOnG
T. Adams, P. Batra, L. Bugel +33
We extend the physics case for a new high-energy, ultra-high statistics neutrino scattering experiment, NuSOnG (Neutrino Scattering On Glass) to address a variety of issues includi…
Shadow bands in single-layered Bi_2Sr_2CuO_6 studied by angle-resolved photoemission spectroscopy
K. Nakayama, T. Sato, T. Dobashi +13
We have performed systematic angle-resolved photoemission spectroscopy (ARPES) on single-layered cuprate superconductor Bi2Sr2CuO6 to elucidate the origin of shadow band. We found…
Imaging nanoscale Fermi surface variations in an inhomogeneous superconductor
W. D. Wise, Kamalesh Chatterjee, M. C. Boyer +8
Particle-wave duality suggests we think of electrons as waves stretched across a sample, with wavevector k proportional to their momentum. Their arrangement in "k-space," and in pa…
Bosonic Mode Mixing in the Superconducting State Spectral Function of Bi_2Sr_2CaCu_2O_{8+delta}
M. R. Norman, H. Ding, J. C. Campuzano +6
Photoemission spectra of Bi_2Sr_2CaCu_2O_{8+delta} below T_c show two features near the (pi,0) point of the zone: a sharp peak at low energy and a higher binding energy hump. We fi…
On the determination of the Fermi surface in high-Tc superconductors by angle-resolved photoemission spectroscopy
J. Mesot, M. Randeria, M. R. Norman +13
We study the normal state electronic excitations probed by angle resolved photoemission spectroscopy (ARPES) in Bi2201 and Bi2212. Our main goal is to establish explicit criteria f…
Fundamental Physics at the Intensity Frontier
J. L. Hewett, H. Weerts, R. Brock +465
The Proceedings of the 2011 workshop on Fundamental Physics at the Intensity Frontier. Science opportunities at the intensity frontier are identified and described in the areas of…
Superconducting Gap Anisotropy and Quasiparticle Interactions: a Doping Dependent ARPES Study
J. Mesot, M. R. Norman, H. Ding +11
Comparing ARPES measurements on Bi2212 with penetration depth data, we show that a description of the nodal excitations of the d-wave superconducting state in terms of non-interact…
ARPES study of the superconducting gap and pseudogap in Bi2Sr2CaCu2O8+x
H. Ding, J. C. Campuzano, M. R. Norman +8
In this paper, we review some of our ARPES results on the superconducting and pseudo gaps in Bi2Sr2CaCu2O8+x. We find that optimally and overdoped samples exhibit a d-wave gap, whi…
The origin of the anomalously strong influence of out-of-plane disorder on high-Tc superconductivity
Y. Okada, T. Takeuchi, T. Baba +2
The electronic structure of Bi2Sr2-xRxCuOy(R=La, Eu) near the (pi,0) point of the first Brillouin zone was studied by means of angle-resolved photoemission spectroscopy (ARPES). Th…
Magnetic-field enhanced aniferromagnetism in non-centrosymmetric heavy-fermion superconductor CePtSi
K. Kaneko, O. Stockert, B. FÃ¥k +4
The effect of magnetic field on the static and dynamic spin correlations in the non-centrosymmetric heavy-fermion superconductor CePtSi was investigated by neutron scattering.…
Density wave probes cuprate quantum phase transition
Tatiana A. Webb, Michael C. Boyer, Yi Yin +8
In cuprates, the strong correlations in proximity to the antiferromagnetic Mott insulating state give rise to an array of unconventional phenomena beyond high temperature supercond…
Evolution of the Fermi surface with carrier concentration in Bi_2Sr_2CaCu_2O_{8+δ}
H. Ding, M. R. Norman, T. Yokoya +6
We show, by use of angle-resolved photoemission spectroscopy, that underdoped Bi_2Sr_2CaCu_2O_{8+δ} appears to have a large Fermi surface centered at (Ï,Ï), even for samples wit…
Universal quasiparticle decoherence in hole- and electron-doped high-Tc cuprates
Z. -H. Pan, P. Richard, A. V. Fedorov +8
We use angle-resolved photoemission to unravel the quasiparticle decoherence process in the high- cuprates. The coherent band is highly renormalized, and the incoherent part m…
Three energy scales characterizing the competing pseudogap state, the incoherent, and the coherent superconducting state in high-Tc cuprates
Y. Okada, T. Kawaguchi, M. Ohkawa +4
We have studied the momentum dependence of the energy gap of Bi2(Sr,R)2CuOy by angleresolved photoemission spectroscopy (ARPES), particularly focusing on the difference between R=L…
Distribution of Blue Galaxies in a Merging Cluster of Galaxies Abell 168
A. Tomita, F. E. Nakamura, T. Takata +4
The fraction of star-forming galaxies in rich clusters of galaxies increases rapidly with the redshift. This is interpreted as the result of a rapid evolution of cluster galaxies,…
Momentum-dependent scaling exponents of nodal self-energies measured in strange metal cuprates and modelled using semi-holography
S. Smit, E. Mauri, L. Bawden +13
The anomalous strange metal phase found in high- cuprates does not follow the conventional condensed-matter principles enshrined in the Fermi liquid and presents a great chall…
Fermi Surface and Pseudogap Evolution in a Cuprate Superconductor
Yang He, Yi Yin, M. Zech +16
The unclear relationship between cuprate superconductivity and the pseudogap state remains an impediment to understanding the high transition temperature (Tc) superconducting mecha…
Low-Energy Excitations and Ground State Selection in Quantum Breathing Pyrochlore Antiferromagnet BaYbZnO
T. Haku, K. Kimura, Y. Matsumoto +10
We study low energy excitations in the quantum breathing pyrochlore antiferromagnet BaYbZnO by combination of inelastic neutron scattering (INS) and thermodynami…
STM imaging of symmetry-breaking structural distortion in the Bi-based cuprate superconductors
Ilija Zeljkovic, Elizabeth J. Main, Tess L. Williams +14
A complicating factor in unraveling the theory of high-temperature (high-Tc) superconductivity is the presence of a "pseudogap" in the density of states, whose origin has been deba…
Decoding the IRX-β dust attenuation relation in star-forming galaxies at intermediate redshift
M. Hamed, F. Pistis, M. Figueira +11
We aim to understand what drives the IRX-βdust attenuation relation at intermediate redshift (0.5 < z < 0.8) in star-forming galaxies. We investigate the role of various galaxy pr…
Square Kilometre Array Science Data Challenge 3a: foreground removal for an EoR experiment
A. Bonaldi, P. Hartley, R. Braun +179
We present and analyse the results of the Science data challenge 3a (SDC3a, https://sdc3.skao.int/challenges/foregrounds), an EoR foreground-removal community-wide exercise organis…
ACD estimation of the S parameter revisited
S. R. Ignjatovic, L. C. R. Wijewardhana, T. Takeuchi
The analytic continuation by duality (ACD) technique has been used to estimate the electroweak S parameter in technicolor models. In this letter, we investigate the reliability of…
ARPES on NaCoO: Fermi surface, extended flat dispersion, and unusual band splitting
H. -B. Yang, S. -C. Wang, A. K. P. Sekharan +11
The electronic structure of single crystals NaCoO, which are closely related to the superconducting NaCoO.HO (), is studied by angle-res…
Doping Dependent Changes in Nitrogen 2 States in the Diluted Magnetic Semiconductor GaCrN
T. Takeuchi, Y. Harada, T. Tokushima +10
We study the electronic structure of the recently discovered diluted magnetic semiconductor GaCrN ( = 0.01-0.10). A systematic study of the changes in the $occupie…
Novel ordering of an S = 1/2 quasi one-dimensional Ising-like anitiferromagnet in magnetic field
S. Kimura, T. Takeuchi, K. Okunishi +5
High-field specific heat measurements on BaCo2V2O8, which is a good realization of an S = 1/2 quasi one-dimensional Ising-like antifferomagnet, have been performed in magnetic fiel…
Compartmentalizing the cuprate strange metal
M. Berben, J. Ayres, C. Duffy +14
It has long been recognized that the key to unlocking the mystery of cuprate high-Tc superconductivity lies in understanding the anomalous normal state from which pairs form and co…
Observation of Modulated Quadrupolar Structures in PrPb3
T. Onimaru, T. Sakakibara, N. Aso +3
Neutron diffraction measurements have been performed on the cubic compound PrPb3 in a [001] magnetic field to examine the quadrupolar ordering. Antiferromagnetic components with q=…
Constraints on Flavor-Diagonal Non-Standard Neutrino Interactions from Borexino Phase-II
S. K. Agarwalla, M. Agostini, K. Altenmüller +103
The Borexino detector measures solar neutrino fluxes via neutrino-electron elastic scattering. Observed spectra are determined by the solar- survival probability $P_{ee}(E)…
The Cosmic Dawn and Epoch of Reionization with the Square Kilometre Array
L. V. E. Koopmans, J. Pritchard, G. Mellema +42
Concerted effort is currently ongoing to open up the Epoch of Reionization (EoR) (15-6) for studies with IR and radio telescopes. Whereas IR detections have been made of sou…
Direct observation of heterogeneous valence state in Yb-based quasicrystalline approximants
M. Matsunami, M. Oura, K. Tamasaku +10
We study the electronic structure of Tsai-type cluster-based quasicrystalline approximants, AuGeYb (AGY-I), AuGeYb (AGY-II), and Zn$_{…