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Physics

Condensed matter

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Displaying 376 - 400 of 1253

High-density polyethylene - an inert additive with stabilizing effects on organic field-effect transistors

September 11, 2020
Author(s)
Alberto Scaccabarozzi, James Basham, Liyang Yu, Paul Westcott, Weimin Zhang, Aram Amassian, Iain McCulloch, Mario Caironi, David J. Gundlach, Natalie Stingelin
Organic electronics technologies have attracted considerable interest over the last decades and have become promising alternatives to conventional, inorganic platforms for specific applications. To fully exploit the touted potential of plastic electronics

Observation of Quantum Anomalous Hall Effect and Exchange Interaction in Topological Insulator/Antiferromagnet Heterostructure

August 27, 2020
Author(s)
Lei Pan, Alexander Grutter, Peng Zhang, Xiaoyu Che, Tomohiro Nozaki, Alex Stern, Mike Street, Bing Zhang, Brian Casas, Qing L. He, Eun S. Choi, Steven M. Disseler, Dustin Gilbert, Gen Yin, Qiming Shao, Peng Deng, Yingying Wu, Xiaoyang Liu, Xufeng Kou, Sahashi Masashi, Xiaodong Han, Christian Binek, Scott Chambers, Jing Xia, Kang L. Wang
Integration of a quantum anomalous Hall insulator with a magnetically ordered material provides an additional degree of freedom through which we may control the resulting exotic quantum states. Here, we report an experimental observation of the quantum

Evolution of the Structural Transition in Mo 1-x W x Te 2

August 24, 2020
Author(s)
John A. Schneeloch, Yu Tao, Chunruo Duan, Masaaki Matsuda, Adam A. Aczel, Jaime A. Fernandez-Baca, Guangyong Xu, Jorg C. Neuefeind, Junjie Yang, Despina Louca
The composition dependence of the structural transition between the monoclinic 1T′ and orthorhombic T d phases in the Mo 1-xW xTe 2 Weyl semimetal was investigated by elastic neutron scattering on single crystals up to x ≅ 0:54. First observed in MoTe 2

Synthesis and Characterization of Bulk Nd 1-x Sr x NiO 2 and Nd 1-x Sr x NiO 3

August 21, 2020
Author(s)
Bi-Xia Wang, Hong Zheng, E. Krivyakina, Omar Chmaissem, Pietro Papa Lopes, Jeffrey W. Lynn, Leighanne C. Gallington, Y. Ren, S. Rosenkranz, J. F. Mitchell, D. Phelan
The recent reports of superconductivity in Nd 1-xSr xNiO 2/SrTiO 3 heterostructures have reinvigorated interest in potential superconductivity of low-valence nickelates. Synthesis of Ni 1+ -containing compounds is notoriously difficult. In the current work

Feshbach resonances in p-wave three-body recombination within Fermi-Fermimixtures of open-shell 6-Li and closed-shell 173-Yb atoms

August 14, 2020
Author(s)
Aliana Green, Hui Li, Jun Hui See Toh, Xinxin Tang, Katherine McCormick, Ming Li, Eite Tiesinga, Svetlana Kotochigova, Subhadeep Gupta
We report on observations and modeling of interspecies magnetic Feshbach resonances in dilute ultracold mixtures of open-shell alkali-metal 6 Li and closed-shell 173 Yb atoms with temperatures just above quantum degeneracy for both fermionic species

Termination Switching of Antiferromagnetic Proximity Effect in Topological Insulator

August 12, 2020
Author(s)
Chao-Yao Yang, Lei Pan, Alexander Grutter, Haiying Wang, Xiaoyu Che, Qing L. He, Yingying Wu, Dustin A. Gilbert, Padraic Shafer, Elke Arenholz, Hao Wu, Gen Yin, Peng Deng, Julie Borchers, William D. Ratcliff, Kang L. Wang
The magnetic proximity effect (MPE) allows exchange-coupling of topological insulators (TIs) with magnetically ordered materials to break time-reversal-symmetry and open a gap in the Dirac-cone surface state, with the goal of realizing quantum anomalous

Towards fast screening of organic solar cell blends

August 5, 2020
Author(s)
Lee Richter, Artem Levistsky, Giovanni M. Matrone, Aditi Khirbat, Ilaria Bargigia, Xiaolei Chu, Oded Nahor, Tamar Segal-Perez, Adam Moule, Carlos Silva, Natalie Stingelin, Gitti L. Frey
The ever increasing library of materials systems developed for organic solar-cells, including highly promising non-fullerene acceptors and new, high-efficiency donor polymers, demands the development of methodologies that (i) allow fast screening of a

Antichiral Spin Order, its Soft Modes, and their Hybridization with Phonons in the Topological Semimetal Mn 3 Ge

August 3, 2020
Author(s)
Y. Chen, Jonathan Gaudet, S. Dasgupta, G. G. Marcus, J. Lin, T. Chen, T. Tomita, M. Ikhlas, Yang Zhao, Wangchun Chen, Matthew B. Stone, O. Tchernyshyov, S. Nakatsuji, Collin L. Broholm
Quantum materials with strong transport responses to disparate physical quantities are of great fundamental significance and may hold technological potentials. The interplay between interactions and topology drive such responses through the effects of

Distinct magneto-Raman signatures of spin-flip phase transitions in CrI3

August 3, 2020
Author(s)
Amber D. McCreary, Thuc T. Mai, Franz Utermohlen, Jeffrey R. Simpson, Kevin F. Garrity, Xiaozhou Feng, Dmitry Shcherbakov, Yanglin Zhu, Jin Hu, Daniel Weber, Kenji Watanabe, Takashi Taniguchi, Joshua Goldberger, Zhiqiang Mao, Chun Ning Lau, Yuanming Lu, Nandini Trivedi, Rolando Valdes Aguilar, Angela R. Hight Walker
The discovery of 2-dimensional (2D) materials, such as CrI3, that retain magnetic ordering down to monolayer thickness, and even more have layer-dependent magnetic properties has led to a plethora of research in 2D magnetism. Here, we report a magneto

Understanding Photovoltaic Energy Losses under Indoor Lighting Conditions

July 28, 2020
Author(s)
Behrang H. Hamadani
The external luminescence quantum yield as a function of the solar cell current density when exposed to low indoor light was estimated based on absolute electroluminescence measurements and a self-consistent use of the electro-optical reciprocity

The effect of strain on tunnel barrier height in silicon quantum devices

July 13, 2020
Author(s)
Ryan Stein, Michael Stewart
Semiconductor quantum dot (QD) devices experience a modulation of the band structure at the edge of lithographically defined gates due to mechanical strain. This modulation can play a prominent role in the device behavior at low temperatures, where QD

Localized Excitons in NbSe2-MoSe2 Heterostructures

July 8, 2020
Author(s)
Jaydeep Joshi, Tong Zhou, Sergiy Krylyuk, Albert Davydov, Igor Zutic, Patrick M. Vora
Neutral and charged excitons (trions) in atomically-thin materials offer important capabilities for photonics, from ultrafast photodetectors to highly-efficient lightemitting diodes and lasers. Recent studies of van der Waals (vdW) heterostructures

Magnetic Phase Transitions and Spin Density Distribution in the Molecular Multiferroic System GaV 4 S 8

July 6, 2020
Author(s)
Rebecca Dally, William Ratcliff, Lunyong Zhang, Heung-Sik Kim, Markus Bleuel, J. W. Kim, Kristjan Haule, David Vanderbilt, Sang-Wook Cheong, Jeffrey Lynn
We have carried out neutron diffraction and small angle neutron scattering measurements on a high quality single crystal of the cubic lacunar spinel multiferroic, GaV 4S 8, as a function of magnetic field and temperature to determine the magnetic form

Anomalous accelerated negative-bias- instability (NBI) at low drain bias

June 30, 2020
Author(s)
Kin P. Cheung
We observed at very low drain bias an anomalous acceleration of Negative-bias-instability at room temperature, as if the channel temperature has been raised significantly. The channel width and channel length dependent of this acceleration suggest that in

Cobalt Ferrite Nanoparticle Intercalated Carbon Nanotubes for a Nanomagnetic Ultrasensitive Sensor for Cr-VI in Water

June 24, 2020
Author(s)
Tassew Mekuria, Syed Khalid, Kathryn L. Krycka, Markus Bleuel, Himanshu Verma, Haiping Hong, Shashi P. Karna, Dereje Seifu
Nanocomposites of cobalt ferrite (CFO) magnetic nanoparticles intercalated on carbon nanotubes (CNTs) are evaluated as a nanomagnetic ultrasensitive sensor for the environmental toxin, hexavalent chromium (Cr-VI). Specifically, the structural and magnetic

Electronic and Magnetic Properties of Stoichiometric CeAuBi 2

June 18, 2020
Author(s)
M. M. Piva, R. Tartaglia, G. S. Freitas, J. C. Souza, D. S. Christovam, S. M. Thomas, Juscelino Leao, William D. Ratcliff, Jeffrey W. Lynn, C. Lane, J.-X Zhu, J. D. Thompson, P. F. S. Rosa, C. Adriano, E. Granado, P. G. Pagliuso
We report the electronic and magnetic properties of stoichiometric CeAuBi 2 single crystals. At ambient pressure, CeAuBi 2 orders antiferromagnetically below a Neel temperature (T N ) of 19 K. Neutron diffraction experiments revealed an antiferromagnetic

Magnetism and Superconductivity in Fe 1+y Te^1-x^Se x

June 18, 2020
Author(s)
J. M. Tranquada, Guangyong Xu, I. A. Zalizyak
Neutron scattering has played a significant role in characterizing magnetic and structural correlations in Fe 1+yTe^1-x^Se x and their connections with superconductivity. Here we review several key aspects of the physics of iorn chalcogenide
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