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Articles by John Singleton
AI Diffusion Gaps: Unequal Integration of AI Across K-12 Schools
Connor Fogal provided outstanding research assistance. Campos acknowledges support from the John E. Jeuck Faculty Fellowship. The views expressed herein are those of the authors and do not necessarily reflect the views of the National Bureau of Economic Research. Copy Citation Christopher Campos and John D. Singleton, "AI Diffusion Gaps: Unequal Integration of AI Across K-12 Schools," NBER Working Paper 35347 (2026), https://doi.org/10.3386/w35347. Download Citation MARC RIS BibTeΧ Related
Identity and Ideology in the School Boardroom
Ariel Gelrud and Meghna Baskar provided outstanding research assistance. We thank David Figlio, Brian Jacob, Vladimir Kogan and numerous seminar participants for their helpful comments. This research received financial support from The Broad Center at Yale SOM. Zimmerman discloses that he holds a volunteer position as a member of the Connecticut State Board of Education and that he has a financial stake in TetherEd, a firm that provides school choice support services to school systems.
Orphan high field superconductivity in non-superconducting uranium ditelluride - Nature Communications
Abstract Reentrant superconductivity is an uncommon phenomenon in which the destructive effects of magnetic field on superconductivity are mitigated, allowing a zero-resistance state to survive under conditions that would otherwise destroy it. Typically, the reentrant superconducting region derives from a zero-field parent superconducting phase.
Revealing Fermi surface evolution and Berry curvature in an ideal type-II Weyl semimetal - Nature Communications
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Abstract In type-II Weyl semimetals (WSMs), the tilting of the Weyl cones leads to the coexistence of electron and hole pockets that touch at the Weyl nodes. These electrons and holes experience the Berry curvature generated by the Weyl nodes, leading to an anomalous Hall effect that is highly sensitive to the Fermi level position. Here we have identified field-induced ferromagnetic MnBi2-xSbxTe4 as an ideal type-II WSM with a single pair of Weyl nodes.
By Qianni Jiang, Johanna Palmström, John Singleton, Shalinee Chikara, David Graf Verified, Chong Wang, Yue Shi, Aaron Wang, Di Xiao
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Nature
Verified
40 Years of School Choice: How American Education Is Being Reshaped
The 74 is partnering with Stanford University’s Hoover Institution to commemorate the 40th anniversary of the ‘A Nation At Risk’ report. Hoover’s A Nation At Risk +40 research initiative spotlights insights and analysis from experts, educators and policymakers as to what evidence shows about the broader impact of 40 years of education reform and how America’s school system has (and hasn’t) changed since the groundbreaking 1983 report.
40 Years After ‘A Nation At Risk,’ How School Choice Policies Are Reshaping American Education
Support The 74's year-end campaign. Make a tax-exempt donation now. The 74 is partnering with Stanford University’s Hoover Institution to commemorate the 40th anniversary of the ‘A Nation At Risk’ report.
40 Years of School Choice: How American Education Is Being Reshaped
The 74 is partnering with Stanford University’s Hoover Institution to commemorate the 40th anniversary of the ‘A Nation At Risk’ report. Hoover’s A Nation At Risk +40 research initiative spotlights insights and analysis from experts, educators and policymakers as to what evidence shows about the broader impact of 40 years of education reform and how America’s school system has (and hasn’t) changed since the groundbreaking 1983 report.
Large anomalous Hall effect and negative magnetoresistance in half-topological semimetals - Communications Physics
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Abstract Proposed mechanisms for large intrinsic anomalous Hall effect (AHE) in magnetic topological semimetals include diverging Berry curvatures of Weyl nodes, anticrossing nodal rings or points of non-trivial bands.
By Yanglin Zhu, David Graf Verified, Seng Huat Lee, John Singleton, Lujin Min, Johanna Palmström, Arun Bansil, Bahadur Singh
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Nature
Verified
Dirac-fermion-assisted interfacial superconductivity in epitaxial topological-insulator/iron-chalcogenide heterostructures - Nature Communications
Abstract Over the last decade, the possibility of realizing topological superconductivity (TSC) has generated much excitement. TSC can be created in electronic systems where the topological and superconducting orders coexist, motivating the continued exploration of candidate material platforms to this end.
Raises for teachers, fewer charters when educators join the school board.
PUBLIC K-12 EDUCATION in the United States is distinctively a local affair: school districts are governed by local boards of education, composed of lay members typically elected in non-partisan elections. These boards have decision-making power over hundreds of billions of public dollars and oversee complex agencies that, in addition to preparing a community's children for the future, can be the biggest employer in town.
Evidence of magnetic fluctuation induced Weyl semimetal state in the antiferromagnetic topological insulator ${\mathrm{Mn}({\mathrm{Bi}}_{1\ensuremath{-}x}{\mathrm{Sb}}_{x})}_{2}{\mathrm{Te}}_{4}$
Abstract We report c-axis transport studies on magnetic topological insulators Mn(Bi1−xSbx)2Te4. We performed systematic c-axis magnetoresistivity measurements under high magnetic fields (up to 35 T) on several representative samples. We find that the lightly hole- and lightly electron-doped samples, while both having the same order of magnitude of carrier density and similar spin-flop transitions, exhibit sharp contrast in electronic anisotropy and transport mechanism.
Assessing School District Decision-Making: Evidence from the COVID-19 Pandemic
We thank Dr. Emily Oster and the COVID-19 School Data Hub team, the Ohio Department of Education, and the Ohio Department of Health for publicly posting data on COVID-19 and school district learning mode decisions that has made this research possible. We are grateful to Zach Halberstam and Gabija Saginaite for able research assistance and to Micah Baum and audiences at AEFP and Notre Dame for helpful comments.
Self-Interest in Public Service: Evidence from School Board Elections
We thank Leah Boustan, Jonathan Guryan, Jacob Krimmel, and participants at University of Rochester, the 2020 Urban Economics Association, and the 2021 European Urban Economics Association meetings for helpful comments and discussions. Data provided by Zillow through the Transaction and Assessment Dataset (ZTRAX). More information on accessing the data can be found at http://www.zillow.com/ztrax. The results and opinions are those of the author(s) and do not reflect the position of Zillow Group.
Today’s Real Systemic Injustice: COVID and Our Kids
Black Lives Matter. Believe All Women. Everybody wants to be on the right side of contentious civil rights issues — that’s why the debate over what that “right side” is becomes so intense. But the most quantifiable systemic injustice in our nation today is not black versus white, or male versus female. It’s old against young. During the coronavirus pandemic, abandonment of adult responsibility in respected institutions — medical, educational, and parental — is indicative of sweeping moral collapse.
Legislature Threatens To Defund Police In Public Schools
By John Singleton Elected representatives from Montgomery, Charles and Prince George’s counties have drafted legislation that could affect the safety and security of all Maryland children. Led by Montgomery County Democrats Gabriel Acevero and Jheanelle Wilkins, House Bill 1089, known as the Police Free Schools Act, is designed to prohibit school districts from contracting with local law enforcement agencies to employ school resource officers (SROs) in public schools.
Horizontal Differentiation and the Policy Effect of Charter Schools
Abstract While school choice may enhance competition, incentives for public schools to raise productivity may be muted if public education is imperfectly substitutable with alter- natives. This paper estimates the aggregate effect of charter school expansion on education quality while accounting for the horizontal differentiation of charter programs.
Non-monotonic pressure dependence of high-field nematicity and magnetism in CeRhIn5
Abstract CeRhIn5 provides a textbook example of quantum criticality in a heavy fermion system: Pressure suppresses local-moment antiferromagnetic (AFM) order and induces superconductivity in a dome around the associated quantum critical point (QCP) near pc ≈ 23 kbar. Strong magnetic fields also suppress the AFM order at a field-induced QCP at Bc ≈ 50 T. In its vicinity, a nematic phase at B* ≈ 28 T characterized by a large in-plane resistivity anisotropy emerges.
Spin–lattice and electron–phonon coupling in 3d/5d hybrid Sr3NiIrO6
Abstract While 3d-containing materials display strong electron correlations, narrow band widths, and robust magnetism, 5d systems are recognized for strong spin–orbit coupling, increased hybridization, and more diffuse orbitals. Combining these properties leads to novel behavior. Sr3NiIrO6, for example, displays complex magnetism and ultra-high coercive fields—up to an incredible 55 T.
American Economic Association
« Back to Results Paper Session Saturday, Jan.
Incentives and the Supply of Effective Charter Schools
Abstract Charter school funding is typically set by formulas that provide the same amount for students regardless of advantage or need. I present evidence that this policy skews the distribution of students served by charters toward low-cost populations by influencing where charter schools open and whether they survive. To do this, I develop and estimate an equilibrium model of charter school supply and competition to evaluate the effects of funding policies that aim to correct these incentives.
Fair starts Monday
The Nelson County Fair will return for its 44th year next week at the Nelson County Fairgrounds. “We are excited,” said Melissa Filiatreau, who has been working with the fair for more than 30 years. “We just hope everyone comes out, because it’ll be fun.” The fair will run Monday through Saturday, and will feature a variety of events including contests, live entertainment, games and rides. Admission is $10 Monday through Thursday, and Friday and Saturday’s admission fee will cost $15.
Letters: Would Jesus spend money on chapel renovation?
The Lewis Memorial Chapel at the Episcopal School Wednesday Feb. 13, 2019, in Baton Rouge, La. More than 40 years after its construction, the Lewis Memorial Chapel at the Episcopal School has been renovated. The most visually obvious work is outside, where a breezeway and covered entrance (narthex) have been added, and an antique iron cross at the peak of the narthex. Inside, new but traditional lighting fixtures are probably the most visual element.
Locals protest firing of U.S. attorney general
Activists lined up on the steps of the Warren County Justice Center to protest the firing of Attorney General Jeff Sessions Thursday evening. The protesters on the corner of Center Street chanted phrases such as “Racist, Sexist, Anti-Gay, Donald Trump: Go Away,” “Just Because You Fire the Cop, Investigations Don’t Stop” and “This is What Democracy Looks Like.” The protest began at the Warren County Justice Center, but the march took to the streets of downtown Bowling Green.
ROTC program hosts 9th Annual Eric D. Yates Memorial Run
WKU Army ROTC program hosted an annual run to raise money for students’ education and remember an alumnus and fallen soldier.The Ninth Annual Eric D. Yates Memorial Run was held on Wednesday at Chaney’s Dairy Barn, 9191 Nashville Rd. Participants could register for a two-mile walk or a 5K Run.Eric D. Yates, a 2008 WKU graduate from Rineyville, was killed in action Sept. 17, 2010 after an explosive device detonated near his patrol in Afghanistan.
Donatos owner and WKU alumnus talks about hard work on road to success
Success doesn’t always equal making a lot of money.
Delta Tau Delta returns to campus after four-year hiatus
Delta Tau Delta fraternity has returned to WKU’s campus after a four-and-a-half-year-long absence with the intention to build better men and improve the community, a chapter consultant said.Ben Grothe, a chapter leadership consultant for Delta Tau Delta, said the chapter closed down in the spring of 2014 because of poor operations.“There wasn’t any major issue or any major event that caused them to close down,” Grothe said.
Cage the Elephant makes appearance to kick off the football season
Last Saturday was a game day to remember for the students, alumni, faculty and staff of WKU.
WKU launches International Year of Cuba
WKU aims to celebrate and explore the country of Cuba through this year’s International Year Of (IYO) program by embedding Cuban culture and topics into curriculum and various events on campus.The IYO is a year-long celebration of a single country that helps provide a global context to the WKU experience.
The Fiscal Externalities of Charter Schools: Evidence from North Carolina
A significant criticism of the charter school movement is that funding for charter schools diverts money away from traditional public schools. The magnitude of such adverse fiscal externalities depends in part on the nature of state and local funding policies. In this paper, we examine the fiscal effects of charter schools on both urban and nonurban school districts in North Carolina.
CHILD CARE CRISIS: Finding workers for facilities challenging at times
SHEPHERDSVILLE -- There is a list of children looking for child care in Bullitt County. There are some day cares with a waiting list. So, why are you seeing several daycares in the community closing their doors? One reason is a lack of qualified workers. Little Sweetheart’s Child Development Center, LLC in Mount Washington marked the third day care center to be closed down due to staffing in Bullitt County on May 25, 2018, according to the owner, Tammy Klumb.
Charter Growth Puts Pressure on Traditional Schools
Policy debates about the net effects of charter schools on students and on the delivery of K-12 education are ongoing and remain highly contentious. In a recent paper, we contribute to the policy discussion by drawing attention to the fiscal externalities of charter schools, a finance topic that deserves more attention in the overall discussion.
From a nation at risk to a democracy at risk: Educating students for democratic renewal
Public schools were invented to prepare people for self-governance, and to work with others towards the improvement of their communities and for the betterment of society. These were the arguments Horace Mann used, in the 1830s, when he led a successful advocacy campaign to launch public education in Massachusetts.
Charter school growth puts fiscal pressure on traditional public schools
Policy debates about the net effects of charter schools on students and on the delivery of K-12 education are ongoing and remain highly contentious. In a recent paper, we contribute to the policy discussion by drawing attention to the fiscal externalities of charter schools, a finance topic that deserves more attention in the overall discussion.
Incentives and the Supply of Effective Charter Schools
Abdulkadiroglu, A., Angrist, J. D., Dynarski, S. M., Kane, T. J., and Pathak, P. A. (2011). Accountability and Flexibility in Public Schools: Evidence from Boston's Charters And Pilots. The Quarterly Journal of Economics, 126(2):699-748. Altonji, J. G., Elder, T. E., and Taber, C. R. (2005). Selection on Observed and Unobserved Variables: Assessing the Effectiveness of Catholic Schools. Journal of Political Economy, 113(1):151-184. Angrist, J., Bettinger, E., Bloom, E., King, E., and Kremer, M. (2002).
In celebration of Ilya Lifshitz
as a young man. Their parents were Mikhail Lifshitz, a physician, and Berta. Mikhail was from a poor Jewish family that lived in the Pale of Settlement in tsarist Russia. He received his medical education in Heidelberg, Germany, where he won a gold medal for student research and, according to family legend, was presented to Queen Victoria as one of the best European medical students. As was traditional in such families, Evgeny and Ilya received a sound early education at home.
Slaves or Mercenaries? Milton Friedman and the Institution of the All-Volunteer Military
Friedman was the leading public proponent for an all-volunteer military. This chapter traces his influence upon the national debate over conscription, which culminated in Friedman’s service on the Gates Commission. Friedman’s argument relied on economic reasoning and appeal to cost-benefit analysis. Central was his conjecture that the social cost of the military draft, which imposed an “implicit tax” on draftees, exceeded that of the all-volunteer military.
The way we were in 1984
Between 1938 and 1984 New Zealand's economy was tightly regulated with a view to ensuring full employment. Robert Muldoon, pictured above, was prime minister from 1975 to 1984. During his tenure he attempted to maintain New Zealand's 'cradle to grave' welfare state in a climate of deteriorating economic conditions. His efforts to stimulate the economy were based on wage and price controls, and huge, expensive industrial and energy projects, labelled 'think big'.
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