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Physics

Condensed matter

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Displaying 126 - 150 of 1260

Quantum Spin Ice Response to a Magnetic Field in the Dipole-Octupole Pyrochlore Ce2Zr2O7

August 28, 2023
Author(s)
E. Smith, J. Dudemaine, B. Placke, R. Schafer, D. Yahne, T. DeLazzer, A. Fitterman, J. Beare, Jonathan N. Gaudet, C.R.C. Buhariwalla, Andrey Podlesnyak, Guangyong Xu, J. Clancy, R. Movshovich, G. Luke, K. Ross, R. Moessner, O. Benton, A. Bianchi, B. Gaulin
The pyrochlore magnet Ce2Zr2O7 has attracted much attention as a quantum spin ice candidate whose novelty derives in part from the dipolar-octupolar nature of the Ce3+ pseudospin-1/2 degrees of freedom it possesses. We report heat capacity measurements on

Structural Origin of Recovered Ferroelectricity in BaTiO3 Nanoparticles

August 24, 2023
Author(s)
Bruce D. Ravel, Trevor Tyson, Han Zhang, Sizhan Liu, SANJIT GHOSE, U.J. Idehenre, Yury Barnakov, S.A. Basun, D.R. Evans
Nanoscale BaTiO3 particles (10 nm) prepared by ball-milling a mixture of oleic acid and heptane have been reported to have an electric polarization several times larger than that for bulk BaTiO3. In this work, detailed local, intermediate, and long-range

Three-Dimensional Neutron Far-Field Tomography of a Bulk Skyrmion Lattice

August 13, 2023
Author(s)
Melissa Henderson, Benjamin Heacock, Markus Bleuel, David Cory, Colin Heikes, Michael G. Huber, Jeffery Krzywon, Olivier Nahman-Levesque, Graeme Luke, M Pula, Dusan Sarenac, Kirill Zhernenkov, Dmitry Pushin
Magnetic skyrmions are localized non-collinear spin textures, characterized by an integer topo-logical charge. Their nanometric size and topological protection gives rise to unique dynamics and emergent electromagnetic phenomena, ideal for spintronic

Imaging local luminescence variations in CdSe0.1Te0.9 thin films grown by the colossal grain growth process.

August 4, 2023
Author(s)
Ganga Neupane, Andrew Winchester, Nicolas Marquez Peraca, David Albin, Joel Duenow, Matthew Reese, Sujitra Pookpanratana, Susanna Thon, Behrang Hamadani
Clear visualization and understanding of luminescence properties of grain interiors and grain boundaries in polycrystalline thin-film photovoltaic materials are crucial to achieving high-performance solar cells. Luminescence-based measurements, for example

Titanium and titanium oxides at the K- and L-edges: comparing theoretical calculations to X-ray absorption and X-ray emission measurements

August 2, 2023
Author(s)
Karina Bzheumikhova, John Vinson, Ranier Unterumsberger, Malte Wansleben, Claudia Zech, Kai Schuler, Yves Kayser, Philipp Honicke, Burkhard Beckhoff
Using well-calibrated experimental data we demonstrate the applicability of theoretical X-ray absorption spectroscopy (XAS) as well as X-ray emission spectroscopy (XES) calculations for titanium (Ti), titanium oxide (TiO), and titanium dioxide (TiO2) at

Disorder-Induced Excitation Continuum in a Spin-1/2 Cobaltate on a Triangular Lattice

July 31, 2023
Author(s)
Bin Gao, Tong Chen, Chien-Lung Huang, Yiming Qiu, Guangyong Xu, Jesse Liebman, Lebing Chen, Matthew B. Stone, Erxi Feng, Huibo Cao, Xiaoping Wang, Xianghan Xu, Sang-Wook Cheong, Stephen Winter, Pengcheng Dai
A spin-1/2 triangular-lattice antiferromagnet is a prototypical frustrated quantum magnet, which exhibits remarkable quantum many-body effects that arise from the synergy between geometric spin frustration and quantum fluctuations. It can host quantum

Quantum Entropic Effects in the Liquid Viscosities of Hydrogen, Deuterium, and Neon

July 26, 2023
Author(s)
Ian Bell, Jacob Leachman, Albert Rigosi, Heather Hill
The extreme conditions have limited the availability and accuracy of experimental thermophys- ical property measurements for cryogens, particularly transport properties. Traditional scaling techniques such as corresponding states theory have long been

Single-Component Superconductivity in UTe2 at Ambient Pressure

July 21, 2023
Author(s)
Florian Theuss, Avi Shragai, Gael Grissonnanche, Ian Hayes, Shanta Saha, Yun Eo, Alonso Suaraz, Tatsuya Shishidou, Nicholas Butch, Johnpierre Paglione, B. Ramshaw
The microscopic mechanism of Cooper pairing in a superconductor leaves its fingerprint on the symmetry of the order parameter. UTe2 has been inferred to have a multi-component order parameter that entails exotic effects like time reversal symmetry breaking

Graphene-Based Star-Mesh Resistance Networks

July 12, 2023
Author(s)
Dean G. Jarrett, Ching-Chen Yeh, Shamith Payagala, Alireza Panna, Yanfei Yang, Linli Meng, Swapnil Mhatre, Ngoc Thanh Mai Tran, Heather Hill, Dipanjan Saha, Randolph Elmquist, David B. Newell, Albert Rigosi

Quantum Disordered Ground State in the Triangular-Lattice Magnet NaRuO 2

July 1, 2023
Author(s)
Brenden R. Ortiz, Paul M. Sarte, Alon H. Avidor, Aurland Hay, Eric Kenney, Alexander I. Kolesnikov, Daniel M. Pajerowski, Adam A. Aczel, Keith M. Taddei, Craig Brown, Chennan Wang, Michael J. Graf, Ram Seshadri, Leon Balents, Stephen Wilson
The realization of spin liquid states born from the near-critical regime of the triangular lattice Hubbard model in inorganic materials remains a long-standing challenge, where weak spin-orbit coupling and other small perturbations often induce

Infinite-randomness criticality in monitored quantum dynamics with static disorder

June 23, 2023
Author(s)
Aidan Zabalo, Justin Wilson, Michael Gullans, Romain Vasseur, Sarang Goplakrishnan, David Huse, Jed Pixley
We consider a model of monitored quantum dynamics with quenched spatial randomness: specifically, random quantum circuits with spatially varying measurement rates. These circuits undergo a measurement-induced phase transition (MIPT) in their entanglement

What limits the voltage of GaAs photovoltaic devices under low indoor light?

June 19, 2023
Author(s)
Behrang Hamadani, Margaret Stevens, Matthew Lumb, Kenneth Schmieder
The external radiative efficiency of a photovoltaic device is a useful metric to compare different photovoltaic technologies and material systems. However, under low-intensity indoor lighting, a particular open-circuit voltage dependence arises that cannot

A non-defect precursor gate oxide breakdown model

June 16, 2023
Author(s)
Kin (Charles) Cheung
Understanding defect creation is central to efforts to comprehend gate dielectric breakdown in metal-oxide-semiconductor-field-effect-transistors (MOSFETs). While gate dielectrics other than SiO2 are now popular, models develop for SiO2 breakdown are used

Melting of the Charge Density Wave by Generation of Pairs of Topological Defects in UTe2

June 14, 2023
Author(s)
Anuva Aishwarya, Julian May-Mann, Avior Almoalem, Sheng Ran, Shanta Saha, Johnpierre Paglione, Nicholas Butch, Eduardo Fradkin, Vidya Madhavan
Topological defects are singularities in an ordered phase that can have a profound effect on phase transitions and serve as a window into the order parameter. Examples of topological defects include dislocations in charge density waves and vortices in a

Multi-k Magnetic Structure and Large Anomalous Hall Effect in Candidate Magnetic Weyl Semimetal NdAlGe

June 13, 2023
Author(s)
C. Dhital, Rebecca Dally, R. Ruvalcaba, R. Gonzalez-Hernandez, J. Guerrero-Sanchez, Huibo Cao, Q. Zhang, W. Tian, Y. Wu, M. Frontzek, S. K. Karna, A. Meads, B. Wilson, R. Chapai, D. Graf, J. Bacsa, R. Jin, J. DiTusa
The magnetic structure, magnetoresistance, and Hall effect of non-centrosymmetric magnetic semimetal NdAlGe are investigated revealing an unusual magnetic state and anomalous transport properties that are associated with the electronic structure of this

The growth of self-intercalated Nb1+xSe2 by molecular beam epitaxy: The effect of processing conditions on the structure and electrical resistivity

June 8, 2023
Author(s)
Peter Litwin, Samantha Jaszewski, Wendy Sarney, Asher Leff, Sergiy Krylyuk, Albert Davydov, Jon Ihlefeld, Stephen McDonnell
We report on the synthesis of self-intercalated Nb1+xSe2 thin films by molecular beam epitaxy. Nb1+xSe2 is a metal-rich phase of NbSe2 where additional Nb atoms populate the van der Waals gap. The grown thin films are studied as a function of the Se to Nb

Magnetic Ground State of the Kitaev Na 2 Co 2 TeO 6 Spin Liquid Candidate

June 2, 2023
Author(s)
Weiliang Yao, Yang Zhao, Yiming Qiu, Christian Balz, Ross Stewart, Jeffrey Lynn, Yuan Li
As a candidate Kitaev material, Na 2Co 2TeO 6 exhibits intriguing magnetism on a honeycomb lattice that is believed to be C 3-symmetric. Here we report a neutron diffraction study of its high-quality single crystals under a-axis magnetic fields. While

pH response of sequence-controlled polyampholyte brushes

May 31, 2023
Author(s)
Xin Yuan, Harold Hatch, Jacinta Conrad, Amanda Marciel, Jeremy Palmer
We use molecular simulation to investigate the pH response of sequence-controlled polyampholyte brushes (PABs) with polymer chains consisting of alternating blocks of weakly acidic and basic monomers. Changes in the ionization state, height, lateral

Exchange-Biased Quantum Anomalous Hall Effect

May 19, 2023
Author(s)
Peng Zhang, Purnima P. Balakrishnan, Christopher Eckberg, Peng Deng, Tomohiro Nozaki, Sukong Chong, Patrick Quarterman, Megan Holtz, Brian B. Maranville, Gang Qiu, Lei Pan, Eve Emmanouilidou, Ni Ni, Masashi Sahashi, Alexander Grutter, Kang L. Wang
The quantum anomalous Hall (QAH) effect is characterized by a dissipationless chiral edge state with a quantized Hall resistance at zero magnetic field. Manipulating the QAH state is of great importance in both the understanding of topological quantum

The Nature of Dynamic Local Order in CH 3 NH 3 Pbl 3 and CH 3 NH 3 PbBr 3

May 17, 2023
Author(s)
Nicholas Weadock, Tyler C. Sterling, Julian A. Vigil, Aryeh Gold-Parker, Ian C. Smith, Ballal Ahammed, Matthew Krogstad, Feng Ye, David Voneshen, Peter M. Gehring, Andrew M. Rappe, Hans-Georg Steinruck, Elif Ertekin, Hemamala I. Karunadasa, Dmitry Reznik, Michael F. Toney
Hybrid lead halide perovskites (LHPs) are a class of semiconductor with novel physical properties and impressive optoelectronic performance that are distinctively governed by structural fluctuations. [1, 2] Diffraction experiments sensitive to average
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