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Publications

Realizing a tunable honeycomb lattice in ABBA-stacked twisted double bilayer WSe2

Cornell Affiliated Author(s)
Author
H. Pan
E.-A. Kim
C.-M. Jian
Abstract

The ideal honeycomb lattice, featuring sublattice and SU(2) spin rotation symmetries, is a fundamental model for investigating quantum matter with topology and correlations. With the rise of the moiré-based design of model systems, realizing a tunable and symmetric honeycomb lattice system with a narrow bandwidth can open access to new phases and insights. We propose the ABBA-stacked twisted double bilayer WSe2 as a realistic and tunable platform for reaching this goal. Adjusting the twist angle allows the bandwidth and the ratio between hopping parameters of different ranges to be tuned.

Journal
Physical Review Research
Date Published
Group (Lab)
Chao-Ming Jian Group

Considerations about future hard x-ray area detectors

Cornell Affiliated Author(s)
Author
S.M. Gruner
G. Carini
A. Miceli
Abstract

X-ray sources continue to advance in both intensity and temporal domains, thereby opening new ways to analyze the structure and properties of matter, provided that the resultant x-ray images can be efficiently and quantitatively recorded. In this perspective we focus on specific limitations of pixel area x-ray detectors. Although pixel area x-ray detectors have also advanced in recent years, many experiments are still detector limited.

Journal
Frontiers in Physics
Date Published
Group (Lab)
Sol M. Gruner Group

Polycrystallinity Enhances Stress Buildup around Ice

Cornell Affiliated Author(s)
Author
D. Gerber
L.A. Wilen
E.R. Dufresne
R.W. Style
Abstract

Damage caused by freezing wet, porous materials is a widespread problem but is hard to predict or control. Here, we show that polycrystallinity significantly speeds up the stress buildup process that underpins this damage. Unfrozen water in grain-boundary grooves feeds ice growth at temperatures below the freezing temperature, leading to fast stress buildup. These stresses can build up to levels that can easily break many brittle materials.

Journal
Physical Review Letters
Date Published
Group (Lab)
Eric Dufresne Group

Context affects student thinking about sources of uncertainty in classical and quantum mechanics

Cornell Affiliated Author(s)
Author
E.M. Stump
M. Dew
G. Passante
N.G. Holmes
Abstract

Measurement uncertainty is an important topic in the undergraduate laboratory curriculum. Previous research on student thinking about experimental measurement uncertainty has focused primarily on introductory-level students' procedural reasoning about data collection and interpretation. In this paper, we extended this prior work to study upper-level students' thinking about sources of measurement uncertainty across experimental contexts, with a particular focus on classical and quantum mechanics contexts.

Journal
Physical Review Physics Education Research
Date Published
Group (Lab)
Natasha Holmes Group

Unveiling the double-peak structure of quantum oscillations in the specific heat

Cornell Affiliated Author(s)
Author
Z. Yang
B. Fauqué
T. Nomura
T. Shitaokoshi
S. Kim
D. Chowdhury
Z. Pribulová
J. Kačmarčík
A. Pourret
G. Knebel
D. Aoki
T. Klein
D.K. Maude
C. Marcenat
Y. Kohama
Abstract

Quantum oscillation phenomenon is an essential tool to understand the electronic structure of quantum matter. Here we report a systematic study of quantum oscillations in the electronic specific heat C el in natural graphite. We show that the crossing of a single spin Landau level and the Fermi energy give rise to a double-peak structure, in striking contrast to the single peak expected from Lifshitz-Kosevich theory. Intriguingly, the double-peak structure is predicted by the kernel term for C el/T in the free electron theory.

Journal
Nature Communications
Date Published
Group (Lab)
Debanjan Chowdhury Group

BLAST: A Wafer-Scale Transfer Process for Heterogeneous Integration of Optics and Electronics

Cornell Affiliated Author(s)
Author
Y. Ji
A.J. Cortese
C.L. Smart
A.C. Molnar
P.L. McEuen
Abstract

A general transfer method is presented for the heterogeneous integration of different photonic and electronic materials systems and devices into a single substrate. Called BLAST, for Bond, Lift, Align, and Slide Transfer, the process works at wafer scale and offers precision alignment, high yield, varying topographies, and suitability for subsequent lithographic processing. BLAST's capabilities is demonstrated by integrating both GaAs and GaN µLEDs with silicon photovoltaics to fabricate optical wireless integrated circuits that up-convert photons from the red to the blue.

Journal
Advanced Electronic Materials
Date Published
Group (Lab)
Paul McEuen Group

Disorder Operator and Renyi Entanglement Entropy of Symmetric Mass Generation

Cornell Affiliated Author(s)
Author
Zi Liu
Yuan Da Liao
Gaopei Pan
Menghan Song
Jiarui Zhao
Weilun Jiang
Chao-Ming Jian
Yi-Zhuang You
Fakher Assaad
Zi Meng
Cenke Xu
Abstract

In recent years a consensus has gradually been reached that the previously proposed deconfined quantum critical point (DQCP) for spin-1/2 systems, an archetypal example of quantum phase transition beyond the classic Landau's paradigm, actually does not correspond to a true unitary conformal field theory (CFT). In this work we carefully investigate another type of quantum phase transition supposedly beyond the similar classic paradigm, the so called ``symmetric mass generation" (SMG) transition proposed in recent years.

Journal
arXiv e-prints
Date Published
Group (Lab)
Chao-Ming Jian Group

Multi-scale time-resolved electron diffraction: A case study in moiré materials

Cornell Affiliated Author(s)
Author
C.J.R. Duncan
M. Kaemingk
W.H. Li
M.B. Andorf
A.C. Bartnik
A. Galdi
M. Gordon
C.A. Pennington
I.V. Bazarov
H.J. Zeng
F. Liu
D. Luo
A. Sood
A.M. Lindenberg
M.W. Tate
D.A. Muller
J. Thom-Levy
S.M. Gruner
J.M. Maxson
Abstract

Ultrafast-optical-pump — structural-probe measurements, including ultrafast electron and x-ray scattering, provide direct experimental access to the fundamental timescales of atomic motion, and are thus foundational techniques for studying matter out of equilibrium. High-performance detectors are needed in scattering experiments to obtain maximum scientific value from every probe particle.

Journal
Elsevier
Date Published
Funding Source
DE-SC0020144
DE-SC0017631
PHY-1549132
DE-AC02-76SF00515
Group (Lab)
Sol M. Gruner Group

RELATIONSHIP BETWEEN MICROSCALE SHEAR MODULUS, COMPOSITION, AND STRUCTURE IN PORCINE, CANINE, AND HUMAN TEMPOROMANDIBULAR-JOINT CARTILAGE: RELEVANCE TO DISEASE AND DEGENERATION

Cornell Affiliated Author(s)
Author
D. Yoon
S. Peralta
N. Fiani
G.S. Reeve
I. Cohen
L.J. Bonassar
Abstract

Fully understanding the complex mechanical function of temporomandibular joint (TMJ) cartilage and the compositional and structural organization that underlie it is a persistent challenge. Changes to composition, structure, and mechanics take place in naturally occurring disease in humans and canines as well as in disease models, such as in pigs.

Journal
European Cells and Materials
Date Published
Research Area
Group (Lab)
Itai Cohen Group

Universal scaling of shear thickening transitions

Cornell Affiliated Author(s)
Author
M. Ramaswamy
I. Griniasty
D.B. Liarte
A. Shetty
E. Katifori
E. Del Gado
J.P. Sethna
B. Chakraborty
I. Cohen
Abstract

Nearly, all dense suspensions undergo dramatic and abrupt thickening transitions in their flow behavior when sheared at high stresses. Such transitions occur when the dominant interactions between the suspended particles shift from hydrodynamic to frictional. Here, we interpret abrupt shear thickening as a precursor to a rigidity transition and give a complete theory of the viscosity in terms of a universal crossover scaling function from the frictionless jamming point to a rigidity transition associated with friction, anisotropy, and shear.

Journal
Journal of Rheology
Date Published
Group (Lab)
Itai Cohen Group
James Sethna Group