Scott Geraedts
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View article: Observing long-lived longwave contrail forcing
Observing long-lived longwave contrail forcing Open
Contrail microphysical simulations and climate simulations have indicated that contrail cirrus cause a substantial fraction of aviation’s climate impact. While the approximations and parameter selections in these simulations have been well…
View article: Benchmarking and improving algorithms for attributing satellite-observed contrails to flights
Benchmarking and improving algorithms for attributing satellite-observed contrails to flights Open
Condensation trail (contrail) cirrus clouds cause a substantial fraction of aviation's climate impact. One proposed method for the mitigation of this impact involves modifying flight paths to avoid particular regions of the atmosphere that…
View article: Benchmarking and improving algorithms for attributing satellite-observed contrails to flights
Benchmarking and improving algorithms for attributing satellite-observed contrails to flights Open
Contrail cirrus clouds persisting in ice-supersaturated air cause a substantial fraction of aviation's climate impact. One proposed method for the mitigation of this impact involves modifying flight paths to avoid particular regions of the…
View article: The effect of uncertainty in humidity and model parameters on the prediction of contrail energy forcing
The effect of uncertainty in humidity and model parameters on the prediction of contrail energy forcing Open
Previous work has shown that while the net effect of aircraft condensation trails (contrails) on the climate is warming, the exact magnitude of the energy forcing per meter of contrail remains uncertain. In this paper, we explore the skill…
View article: Contrail Detection on GOES-16 ABI With the OpenContrails Dataset
Contrail Detection on GOES-16 ABI With the OpenContrails Dataset Open
Contrails (condensation trails) are line-shaped ice clouds caused by aircraft and are a substantial contributor to aviation-induced climate change. Contrail avoidance is potentially an inexpensive way to significantly reduce the climate im…
View article: A scalable system to measure contrail formation on a per-flight basis
A scalable system to measure contrail formation on a per-flight basis Open
Persistent contrails make up a large fraction of aviation's contribution to global warming. We describe a scalable, automated detection and matching (ADM) system to determine from satellite data whether a flight has made a persistent contr…
View article: A scalable system to measure contrail formation on a per-flight basis
A scalable system to measure contrail formation on a per-flight basis Open
Persistent contrails make up a large fraction of aviation's contribution to global warming. We describe a scalable, automated detection and matching (ADM) system to determine from satellite data whether a flight has made a persistent contr…
View article: OpenContrails: Benchmarking Contrail Detection on GOES-16 ABI
OpenContrails: Benchmarking Contrail Detection on GOES-16 ABI Open
Contrails (condensation trails) are line-shaped ice clouds caused by aircraft and are likely the largest contributor of aviation-induced climate change. Contrail avoidance is potentially an inexpensive way to significantly reduce the clima…
View article: HAMILTONIAN MONTE CARLO IN INVERSE PROBLEMS. ILL-CONDITIONING AND MULTIMODALITY
HAMILTONIAN MONTE CARLO IN INVERSE PROBLEMS. ILL-CONDITIONING AND MULTIMODALITY Open
The Hamiltonian Monte Carlo (HMC) method allows sampling from continuous densities. Favorable scaling with dimension has led to wide adoption of HMC by the statistics community. Modern autodifferentiating software should allow more widespr…
View article: Hamiltonian Monte Carlo in Inverse Problems; Ill-Conditioning and Multi-Modality
Hamiltonian Monte Carlo in Inverse Problems; Ill-Conditioning and Multi-Modality Open
The Hamiltonian Monte Carlo (HMC) method allows sampling from continuous densities. Favorable scaling with dimension has led to wide adoption of HMC by the statistics community. Modern auto-differentiating software should allow more widesp…
View article: A Condition Number for Hamiltonian Monte Carlo
A Condition Number for Hamiltonian Monte Carlo Open
Hamiltonian Monte Carlo is a popular sampling technique for smooth target densities. The scale lengths of the target have long been known to influence integration error and sampling efficiency. However, quantitative measures intrinsic to t…
View article: Lattice Monte Carlo for quantum Hall states on a torus
Lattice Monte Carlo for quantum Hall states on a torus Open
The Monte Carlo method is very useful for studying various model states proposed for the fractional quantum Hall systems. In this paper, we introduce a lattice Monte Carlo method based on an exact lattice formalism for quantum Hall problem…
View article: Berry Phase and Model Wave Function in the Half-Filled Landau Level
Berry Phase and Model Wave Function in the Half-Filled Landau Level Open
We construct model wave functions for the half-filled Landau level parametrized by "composite fermion occupation-number configurations" in a two-dimensional momentum space, which correspond to a Fermi sea with particle-hole excitations. Wh…
View article: Evidence for a topological “exciton Fermi sea” in bilayer graphene
Evidence for a topological “exciton Fermi sea” in bilayer graphene Open
The quantum Hall physics of bilayer graphene is extremely rich due to the\ninterplay between a layer degree of freedom and delicate fractional states.\nRecent experiments show that when an electric field perpendicular to the\nbilayer cause…
View article: Publisher’s Note: Investigating Anisotropic Quantum Hall States with Bimetric Geometry [Phys. Rev. Lett. <b>119</b>, 146602 (2017)]
Publisher’s Note: Investigating Anisotropic Quantum Hall States with Bimetric Geometry [Phys. Rev. Lett. <b>119</b>, 146602 (2017)] Open
Received 6 February 2018DOI:https://doi.org/10.1103/PhysRevLett.120.089902© 2018 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasLandau levelsNematic orderQuantum Hall effectSemiconductorsTopological phases of matter…
View article: Integer quantum Hall transition in a fraction of a Landau level
Integer quantum Hall transition in a fraction of a Landau level Open
We investigate the quantum Hall problem in the lowest Landau level in two\ndimensions, in the presence of an arbitrary number of $\\delta$-function\npotentials arranged in different geometric configurations. When the number of\ndelta funct…
View article: Publisher’s Note: Investigating Anisotropic Quantum Hall States with Bimetric Geometry [Phys. Rev. Lett. <b>119</b>, 146602 (2017)]
Publisher’s Note: Investigating Anisotropic Quantum Hall States with Bimetric Geometry [Phys. Rev. Lett. <b>119</b>, 146602 (2017)] Open
This corrects the article DOI: 10.1103/PhysRevLett.119.146602.
View article: Investigating Anisotropic Quantum Hall States with Bimetric Geometry
Investigating Anisotropic Quantum Hall States with Bimetric Geometry Open
We construct a low energy effective theory of anisotropic fractional quantum Hall (FQH) states. We develop a formalism similar to that used in the bimetric approach to massive gravity, and apply it to describe Abelian anisotropic FQH state…
View article: Composite fermions in bands with <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>N</mml:mi></mml:math>-fold rotational symmetry
Composite fermions in bands with -fold rotational symmetry Open
We study the effect of band anisotropy with discrete rotational symmetry\n$C_N$ (where $N\\ge 2$) in the quantum Hall regime of two-dimensional electron\nsystems. We focus on the composite Fermi liquid (CFL) at half filling of the\nlowest …
View article: Lattice realization of a bosonic integer quantum Hall state–trivial insulator transition and relation to the self-dual line in the easy-plane NCCP1 model
Lattice realization of a bosonic integer quantum Hall state–trivial insulator transition and relation to the self-dual line in the easy-plane NCCP1 model Open
We provide an explicit lattice model of bosons with two separately conserved boson species [U(1)×U(1) global symmetry] realizing a direct transition between an integer quantum Hall effect of bosons and a trivial phase, where any intermedia…
View article: Emergent particle-hole symmetry in spinful bosonic quantum Hall systems
Emergent particle-hole symmetry in spinful bosonic quantum Hall systems Open
When a fermionic quantum Hall system is projected into the lowest Landau\nlevel, there is an exact particle-hole symmetry between filling fractions $\\nu$\nand $1-\\nu$. We investigate whether a similar symmetry can emerge in bosonic\nquan…
View article: Connection between Fermi contours of zero-field electrons and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>ν</mml:mi><mml:mo>=</mml:mo><mml:mfrac><mml:mn>1</mml:mn><mml:mn>2</mml:mn></mml:mfrac></mml:mrow></mml:math> composite fermions in two-dimensional systems
Connection between Fermi contours of zero-field electrons and composite fermions in two-dimensional systems Open
We investigate the relation between the Fermi sea (FS) of zero-field carriers\nin two-dimensional systems and the FS of the corresponding composite fermions\nwhich emerge in a high magnetic field at filling $\\nu = \\frac{1}{2}$, as the\nk…
View article: Numerical study of anisotropy in a composite Fermi liquid
Numerical study of anisotropy in a composite Fermi liquid Open
We perform density-matrix renormalization group studies of a two-dimensional\nelectron gas in a high magnetic field and with an anisotropic band mass. At\nhalf-filling in the lowest Landau level, such a system is a Fermi liquid of\ncomposi…
View article: Emergent local integrals of motion without a complete set of localized eigenstates
Emergent local integrals of motion without a complete set of localized eigenstates Open
Systems where all energy eigenstates are localized are known to display an\nemergent local integrability, in the sense that one can construct an extensive\nnumber of operators that commute with the Hamiltonian and are localized in real\nsp…
View article: Many-body localization and thermalization: Insights from the entanglement spectrum
Many-body localization and thermalization: Insights from the entanglement spectrum Open
We study the entanglement spectrum in the many body localizing and\nthermalizing phases of one and two dimensional Hamiltonian systems, and\nperiodically driven `Floquet' systems. We focus on the level statistics of the\nentanglement spect…
View article: The half-filled Landau level: The case for Dirac composite fermions
The half-filled Landau level: The case for Dirac composite fermions Open
All is well with particle-hole symmetry In an external magnetic field, the energy of an electron in a two-dimensional system takes discrete values, called Landau levels. At high enough fields, all electrons in a solid can fit in the lowest…
View article: Monte Carlo study of phase transitions out of symmetry-enriched topological phases of bosons in two dimensions
Monte Carlo study of phase transitions out of symmetry-enriched topological phases of bosons in two dimensions Open
We study a statistical mechanics model of two species of bosons with mutual statistics θ=2π/n in (2+1) dimensions. This model realizes a fractionalized topological phase of bosons, which is a fractionalized version of the boson integer qua…
View article: Monte Carlo study of phase transitions out of Symmetry-Enriched Topological phases of bosons in two dimensions
Monte Carlo study of phase transitions out of Symmetry-Enriched Topological phases of bosons in two dimensions Open
We study a statistical mechanics model of two species of bosons with mutual statistics $θ=2π/n$ in (2+1) dimensions. This model realizes a fractionalized topological phase of bosons, which is a fractionalized version of the boson integer q…
View article: Competing Abelian and non-Abelian topological orders in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>ν</mml:mi><mml:mo>=</mml:mo><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mn>3</mml:mn><mml:mo>+</mml:mo><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mn>3</mml:mn></mml:mrow></mml:math>quantum Hall bilayers
Competing Abelian and non-Abelian topological orders inquantum Hall bilayers Open
Bilayer quantum Hall systems, realized either in two separated wells or in the lowest two subbands of a wide quantum well, provide an experimentally realizable way to tune between competing quantum orders at the same filling fraction. Usin…