Publications (61)
Searches for continuous gravitational waves from nine young supernova remnants
J. Aasi, B. P. Abbott, R. Abbott +887
We describe directed searches for continuous gravitational waves in data from the sixth LIGO science data run. The targets were nine young supernova remnants not associated with pu…
Kinetic Inductance and nonlinearity of MgB2 Films at 4K
J. Greenfield, C. Bell, F. Faramarzi +6
We report on the fabrication and characterization of superconducting magnesium diboride (MgB) thin films intended for quantum-limited devices based non-linear kinetic inductanc…
The NINJA-2 project: Detecting and characterizing gravitational waveforms modelled using numerical binary black hole simulations
The LIGO Scientific Collaboration, the Virgo Collaboration, 2 Collaboration +888
The Numerical INJection Analysis (NINJA) project is a collaborative effort between members of the numerical relativity and gravitational-wave astrophysics communities. The purpose…
DMRadio-Core: A new approach for GUT-scale axion searches
V. Ankel, C. Bartram, J. Begin +33
Searches for QCD axions with masses in the neV/ mass range are strongly motivated by new physics at the GUT scale and by well-motivated pre-inflationary axion symmetry breakin…
The characterization of Virgo data and its impact on gravitational-wave searches
J. Aasi, J. Abadie, B. P. Abbott +798
Between 2007 and 2010 Virgo collected data in coincidence with the LIGO and GEO gravitational-wave (GW) detectors. These data have been searched for GWs emitted by cataclysmic phen…
Tuneable Correlated Disorder in Alloys
D. Chaney, A. Castellano, A. Bosak +8
Understanding the role of disorder and the correlations that exist within it, is one of the defining challenges in contemporary materials science. However, there are few material s…
The potential profile at the LaAlO3/SrTiO3 (001) heterointerface in operando conditions
M. Minohara, Y. Hikita, C. Bell +7
We report measurements of the gate-bias dependent band alignment, especially the confining potential profile, at the conducting LaAlO3/SrTiO3 (001) heterointerface using soft and h…
Noise limits for dc SQUID readout of high- resonators below 300 MHz
V. Ankel, C. Bartram, J. Begin +38
We present the limits on noise for the readout of cryogenic high- resonators using dc Superconducting Quantum Interference Devices (SQUIDs) below 300 MHz. This analysis uses rea…
A First Search for coincident Gravitational Waves and High Energy Neutrinos using LIGO, Virgo and ANTARES data from 2007
The ANTARES Collaboration, the LIGO Scientific Collaboration, the Virgo Collaboration +959
We present the results of the first search for gravitational wave bursts associated with high energy neutrinos. Together, these messengers could reveal new, hidden sources that are…
Nonlinear Optical Response of SrTiO3/LaAlO3 Superlattices
N. Ogawa, K. Miyano, M. Hosoda +4
The electronic symmetry of the SrTiO3/LaAlO3 interface was investigated by optical second harmonic generation, using superlattices with varying periodicity to study the evolution o…
Thickness dependence of the mobility at the LaAlO_3 / SrTiO_3 interface
C. Bell, S. Harashima, Y. Hikita +1
The electronic transport properties of a series of LaAlO_3 / SrTiO_3 interfaces were investigated, and a systematic thickness dependence of the sheet resistance and magnetoresistan…
Characteristics of strong ferromagnetic Josephson junctions with epitaxial barriers
C. Bell, R. Loloee, G. Burnell +1
We present the measurement of superconductor / ferromagnetic Josephson junctions, based on an epitaxial Nb bottom electrode and epitaxial Fe20Ni80 barrier. Uniform junctions have b…
Transistor operation and mobility enhancement in top-gated LaAlO_3 / SrTiO_3 heterostructures
M. Hosoda, Y. Hikita, H. Y. Hwang +1
We report the operation of LaAlO_3 / SrTiO_3 depletion mode top-gated junction field-effect transistors using a range of LaAlO_3 thicknesses as the top gate insulator. Gated Hall b…
Common Origin of the Circular-dichroism Pattern in ARPES of SrTiO3 and CuxBi2Se3
Y. Ishida, H. Kanto, A. Kikkawa +15
Circular dichroism in the angular distribution (CDAD) of photoelectrons from SrTiO3:Nb and CuxBi2Se3 is investigated by 7-eV laser ARPES. In addition to the well-known node that oc…
United States Muon Collider Community White Paper for the European Strategy for Particle Physics Update
A. Abdelhamid, D. Acosta, P. Affleck +301
This document is being submitted to the 2024-2026 European Strategy for Particle Physics Update (ESPPU) process on behalf of the US Muon Collider community, with its preparation co…
Sudden Critical Current Drops Induced in S/F Structures
E. J. Patino, C. Bell, M. G. Blamire
In the search for new physical properties of S/F structures, we have found that the superconductor critical current can be controlled by the domain state of the neighboring ferroma…
A review of uranium-based thin films
R. Springell, E. Lawrence Bright, D. A. Chaney +4
Thin films based on silicon and transition-metal elements dominate the semiconducting industry and are ubiquitous in all modern devices. Films have also been produced in the rare-e…
Stoichiometry control of the electronic properties of the LaAlO_3/SrTiO_3 heterointerface
H. K. Sato, C. Bell, Y. Hikita +1
We investigate the effect of the laser parameters of pulsed laser deposition on the film stoichiometry and electronic properties of LaAlO_3/SrTiO_3 (001) heterostructures. The La/A…
Materials for Quantum Technologies: a Roadmap for Spin and Topology
N. Banerjee, C. Bell, C. Ciccarelli +22
In this Perspective article, we explore some of the promising spin and topology material platforms (e.g. spins in semi- and superconductors, skyrmionic, topological and 2D material…
Swift follow-up observations of candidate gravitational-wave transient events
P. A. Evans, J. K. Fridriksson, N. Gehrels +813
We present the first multi-wavelength follow-up observations of two candidate gravitational-wave (GW) transient events recorded by LIGO and Virgo in their 2009-2010 science run. Th…
Proximity and Josephson effects in superconductor - antiferromagnetic Nb / γ-Fe50Mn50 heterostructures
C. Bell, E. J. Tarte, G. Burnell +3
We study the proximity effect in superconductor (S), antiferromagnetic (AF) bilayers, and report the fabrication and measurement of the first trilayer S/AF/S Josephson junctions. T…
Critical Current Oscillations in Strong Ferromagnetic Pi-Junctions
J. W. A. Robinson, S. Piano, G. Burnell +2
We report magnetic and electrical measurements of Nb Josephson junctions with strongly ferromagnetic barriers of Co, Ni and Ni80Fe20 (Py). All these materials show multiple oscilla…
Magnetic anisotropy in Fe/U and Ni/U bilayers
E. R. Gilroy, M. -H. Wu, M. Gradhand +2
Magnetometry measurements of Fe/U and Ni/U bilayer systems reveal a non-monotonic dependence of the magnetic anisotropy for U thicknesses in the range 0 nm - 8 nm, with the Fe/U bi…
Controllable Josephson current through a pseudo-spin-valve structure
C. Bell, G. Burnell, C. W. Leung +3
A thin Co/Cu/Permalloy (NiFe) pseudo-spin-valve structure is sandwiched between superconducting Nb contacts. When the current is passed perpendicular to the plane of…
A directed search for gravitational waves from Scorpius X-1 with initial LIGO
The LIGO Scientific Collaboration, the Virgo Collaboration, J. Aasi +891
We present results of a search for continuously-emitted gravitational radiation, directed at the brightest low-mass X-ray binary, Scorpius X-1. Our semi-coherent analysis covers 10…
Dramatic Mobility Enhancements in Doped SrTiO3 Thin Films by Defect Management
Y. Kozuka, Y. Hikita, C. Bell +1
We report bulk-quality n-type SrTiO3 (n-SrTiO3) thin films fabricated by pulsed laser deposition, with electron mobility as high as 6600 cm2 V-1 s-1 at 2 K and carrier density as l…
A directed search for continuous Gravitational Waves from the Galactic Center
The LIGO Scientific Collaboration, The Virgo Collaboration, J. Aasi +871
We present the results of a directed search for continuous gravitational waves from unknown, isolated neutron stars in the Galactic Center region, performed on two years of data fr…
Methods and results of a search for gravitational waves associated with gamma-ray bursts using the GEO600, LIGO, and Virgo detectors
The LIGO Scientific Collaboration, the Virgo Collaboration, J. Aasi +889
In this paper we report on a search for short-duration gravitational wave bursts in the frequency range 64 Hz-1792 Hz associated with gamma-ray bursts (GRBs), using data from GEO60…
Narrow-band search of continuous gravitational-wave signals from Crab and Vela pulsars in Virgo VSR4 data
The LIGO Scientific Collaboration, the Virgo Collaboration, J. Aasi +894
In this paper we present the results of a coherent narrow-band search for continuous gravitational-wave signals from the Crab and Vela pulsars conducted on Virgo VSR4 data. In orde…
Application of a Hough search for continuous gravitational waves on data from the 5th LIGO science run
The LIGO Scientific Collaboration, The Virgo Collaboration, J. Aasi +876
We report on an all-sky search for periodic gravitational waves in the frequency range with the first derivative of frequency in the range $-8.9 \times 10^{-1…
Scanning SQUID Susceptometry of a paramagnetic superconductor
J. R. Kirtley, B. Kalisky, J. A. Bert +8
Scanning SQUID susceptometry images the local magnetization and susceptibility of a sample. By accurately modeling the SQUID signal we can determine the physical properties such as…
Search for long-lived gravitational-wave transients coincident with long gamma-ray bursts
The LIGO Scientific Collaboration, the Virgo Collaboration, J. Aasi +875
Long gamma-ray bursts (GRBs) have been linked to extreme core-collapse supernovae from massive stars. Gravitational waves (GW) offer a probe of the physics behind long GRBs. We inv…
Direct imaging of the coexistence of ferromagnetism and superconductivity at the LaAlO3/SrTiO3 interface
J. A. Bert, B. Kalisky, C. Bell +4
LaAlO3 and SrTiO3 are insulating, nonmagnetic oxides, yet the interface between them exhibits a two-dimensional electron system with high electron mobility,1 superconductivity at l…
Coexistence of two- and three-dimensional Shubnikov-de Haas oscillations in Ar^+ -irradiated KTaO_3
S. Harashima, C. Bell, M. Kim +3
We report the electron doping in the surface vicinity of KTaO_3 by inducing oxygen-vacancies via Ar^+ -irradiation. The doped electrons have high mobility (> 10^4 cm^2/Vs) at low t…
Searching for stochastic gravitational waves using data from the two co-located LIGO Hanford detectors
The LIGO Scientific Collaboration, the Virgo Collaboration, J. Aasi +873
Searches for a stochastic gravitational-wave background (SGWB) using terrestrial detectors typically involve cross-correlating data from pairs of detectors. The sensitivity of such…
Enhancing the electron mobility via delta-doping in SrTiO3
Y. Kozuka, M. Kim, H. Ohta +3
We fabricated high-mobility δ-doped structures in SrTiO3 thin films in order to investigate the low temperature electronic transport properties of confined carriers in this system…
Multimessenger Search for Sources of Gravitational Waves and High-Energy Neutrinos: Results for Initial LIGO-Virgo and IceCube
The IceCube Collaboration, The LIGO Scientific Collaboration, The Virgo Collaboration +1185
We report the results of a multimessenger search for coincident signals from the LIGO and Virgo gravitational-wave observatories and the partially completed IceCube high-energy neu…
Fermi surface and superconductivity in low-density high-mobility δ-doped SrTiO3
M. Kim, C. Bell, Y. Kozuka +3
The electronic structure of low-density n-type SrTiO3 delta-doped heterostructures is investigated by angular dependent Shubnikov-de Haas oscillations. In addition to a controllabl…
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…
Improved Upper Limits on the Stochastic Gravitational-Wave Background from 2009-2010 LIGO and Virgo Data
The LIGO Scientific Collaboration, the Virgo Collaboration, J. Aasi +846
Gravitational waves from a variety of sources are predicted to superpose to create a stochastic background. This background is expected to contain unique information from throughou…
Search for gravitational radiation from intermediate mass black hole binaries in data from the second LIGO-Virgo joint science run
The LIGO Scientific Collaboration, the Virgo Collaboration, J. Aasi +847
This paper reports on an unmodeled, all-sky search for gravitational waves from merging intermediate mass black hole binaries (IMBHB). The search was performed on data from the sec…
First Searches for Optical Counterparts to Gravitational-wave Candidate Events
The LIGO Scientific Collaboration, the Virgo Collaboration, J. Aasi +904
During the LIGO and Virgo joint science runs in 2009-2010, gravitational wave (GW) data from three interferometer detectors were analyzed within minutes to select GW candidate even…
Dominant mobility modulation by the electric field effect at the LaAlO_3 / SrTiO_3 interface
C. Bell, S. Harashima, Y. Kozuka +4
Caviglia et al. [Nature (London) 456, 624 (2008)] have found that the superconducting LaAlO_3 / SrTiO_3 interface can be gate modulated. A central issue is to determine the princip…
Structural properties of epitaxial α-U thin films on Ti, Zr, W and Nb
R. Nicholls, D. A. Chaney, G. H. Lander +2
Thin layers of orthorhombic uranium (α-U) have been grown onto buffered sapphire substrates by d.c. magnetron sputtering, resulting in the discovery of new epitaxial matches to Ti…
Search for gravitational wave ringdowns from perturbed intermediate mass black holes in LIGO-Virgo data from 2005-2010
The LIGO Scientific Collaboration, the Virgo Collaboration, J. Aasi +849
We report results from a search for gravitational waves produced by perturbed intermediate mass black holes (IMBH) in data collected by LIGO and Virgo between 2005 and 2010. The se…
Intrinsic spin-orbit coupling in superconducting δ-doped SrTiO3 heterostructures
M. Kim, Y. Kozuka, C. Bell +2
We report the violation of the Pauli limit due to intrinsic spin-orbit coupling in SrTiO3 heterostructures. Via selective doping down to a few nanometers, a two-dimensional superco…
Constraints on cosmic strings from the LIGO-Virgo gravitational-wave detectors
J. Aasi, J. Abadie, B. P. Abbott +873
Cosmic strings can give rise to a large variety of interesting astrophysical phenomena. Among them, powerful bursts of gravitational waves (GWs) produced by cusps are a promising o…
Magnetotransport effects in polar versus non-polar SrTiO3 based heterostructures
E. Flekser, M. Ben Shalom, M. Kim +4
Anisotropic magnetoresistance and negative magnetoresistance for in-plane fields are compared for the LaAlO3 /SrTiO3 interface and the symmetric Nb-doped SrTiO3 heterostructure. Bo…
Characterization of the LIGO detectors during their sixth science run
The LIGO Scientific Collaboration, The Virgo Collaboration, J. Aasi +867
In 2009-2010, the Laser Interferometer Gravitational-wave Observa- tory (LIGO) operated together with international partners Virgo and GEO600 as a network to search for gravitation…
Implementation of an F-statistic all-sky search for continuous gravitational waves in Virgo VSR1 data
J. Aasi, B. P. Abbott, R. Abbott +848
We present an implementation of the -statistic to carry out the first search in data from the Virgo laser interferometric gravitational wave detector for periodic grav…
The Cryogenic System of DMRadio-50L
V. Ankel, C. Bartram, J. Begin +36
The DMRadio-50L experiment is designed to search for axion dark matter in the 5 kHz - 5 MHz frequency range using a lumped-element LC resonator and a toroidal magnet and to serve a…
Search for Gravitational Waves from Binary Black Hole Inspiral, Merger and Ringdown in LIGO-Virgo Data from 2009-2010
The LIGO Scientific Collaboration, the Virgo Collaboration, J. Aasi +800
We report a search for gravitational waves from the inspiral, merger and ringdown of binary black holes (BBH) with total mass between 25 and 100 solar masses, in data taken at the…
Gravitational waves from known pulsars: results from the initial detector era
J. Aasi, J. Abadie, B. P. Abbott +892
We present the results of searches for gravitational waves from a large selection of pulsars using data from the most recent science runs (S6, VSR2 and VSR4) of the initial generat…
Einstein@Home all-sky search for periodic gravitational waves in LIGO S5 data
J. Aasi, J. Abadie, B. P. Abbott +794
This paper presents results of an all-sky searches for periodic gravitational waves in the frequency range [50, 1190] Hz and with frequency derivative ranges of [-2 x 10^-9, 1.1 x…
Parameter estimation for compact binary coalescence signals with the first generation gravitational-wave detector network
the LIGO Scientific Collaboration, the Virgo Collaboration, J. Aasi +801
Compact binary systems with neutron stars or black holes are one of the most promising sources for ground-based gravitational wave detectors. Gravitational radiation encodes rich i…
Flux-flow induced giant magnetoresistance in all-amorphous superconductor-ferromagnet hybrids
C. Bell, S. Tursucu, J. Aarts
We present magnetoresistance measurements on all-amorphous ferromagnet (F) / superconductor (S) heterostructures. The F/S/F trilayers show large magnetoresistance peaks in a small…
Spin dynamics in a superconductor / ferromagnet proximity system
C. Bell, S. Milikisyants, M. Huber +1
The ferromagnetic resonance of thin sputtered Ni80Fe20 films grown on Nb is measured. By varying the temperature and thickness of the Nb the role of the superconductivity on the wh…
Electromagnetic modeling and science reach of DMRadio-m
DMRadio Collaboration, A. AlShirawi, V. Ankel +45
DMRadio-m is an experiment that is designed to be sensitive to KSVZ and DFSZ QCD axion models in the 10--200\,MHz (41 neV -- 0.83 eV/) range. The experiment uses…
Search for gravitational waves associated with gamma-ray bursts detected by the InterPlanetary Network
The LIGO Scientific Collaboration, the Virgo Collaboration, J. Aasi +901
We present the results of a search for gravitational waves associated with 223 gamma-ray bursts (GRBs) detected by the InterPlanetary Network (IPN) in 2005-2010 during LIGO's fifth…
First all-sky search for continuous gravitational waves from unknown sources in binary systems
The LIGO Scientific Collaboration, the Virgo Collaboration, J. Aasi +849
We present the first results of an all-sky search for continuous gravitational waves from unknown spinning neutron stars in binary systems using LIGO and Virgo data. Using a specia…
Metal-to-insulator transition in anatase TiO2 thin films induced by growth rate modulation
T. Tachikawa, M. Minohara, Y. Nakanishi +5
We demonstrate control of the carrier density of single phase anatase TiO2 thin films by nearly two orders of magnitude by modulating the growth kinetics during pulsed laser deposi…