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Physics

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Displaying 601 - 625 of 2291

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

Electron-electron interactions in low-dimensional Si:P delta layers

June 15, 2020
Author(s)
Joseph Hagmann, Xiqiao Wang, Ranjit Kashid, Pradeep Namboodiri, Jonathan Wyrick, Scott W. Schmucker, Michael Stewart, Richard M. Silver, Curt A. Richter
Key to producing quantum computing devices based on the atomistic placement of dopants in silicon by scanning tunneling microscope (STM) lithography is the formation of embedded highly doped Si:P delta layers (δ-layers). This study investigates the

Structural, Magnetic, and Electronic Evolution of the Spin-Ladder System BaFe 2 S 3-x Se x with Isoelectronic Substitution

June 12, 2020
Author(s)
Jia Yu, Meng Wang, Benjamin A. Frandsen, Hualei Sun, Junjie Yin, Zengjia Liu, Shan Wu, Ming Yi, Zhijun Xu, Arani Acharya, Qingzhen Huang, Edith Bourret-Courchesne, Jeffrey W. Lynn, Robert J. Birgeneau
We report experimental studies of a series of BaFe 2S 3-xSe x (0less than or equal to}xless than or equal to}3) single crystals and powder specimens using x-ray diffraction, neutron diffraction, muon spin relaxation, and electrical transport measurements

Ferromagnetism in van der Waals Compound MnSb 1.8 Bi 0.2 Te 4

June 11, 2020
Author(s)
Yangyang Chen, Ya-Wen Chuang, Seng Huat Lee, Yanglin Zhu, Kevin Honz, Yingdong Guan, Yu Wang, Ke Wang, Zhiqiang Mao, Jun Zhu, Colin A. Heikes, Patrick Quarterman, P. Zajdel, Julie Borchers, William D. Ratcliff
The intersection of topology and magnetism represent a new playground to discover novel quantum phenomena and new device concepts. In this work, we show that a van der Waals compound MnSb 1.8 Bi 0.2Te 4 exhibits a ferromagnetic ground state with a Curie

Topological Singularity Induced Chiral Kohn Anomaly in a Weyl Semimetal

June 11, 2020
Author(s)
Thanh Nguyen, Fei Han, Nina Andrejevic, Ricardo Pablo-Pedro, Anju Apte, Yoichiro Tsurimaki, Zhiwei Ding, Kunyan Zhang, Ahmet Alatas, Ercan E. Alp, Songxue Chi, Jaime Fernandez-Baca, Masaaki Matsuda, David Alan Tennant, Yang Zhao, Zhijun Xu, Jeffrey W. Lynn, Shengxi Huang, Mingda Li
The electron-phonon interaction (EPI) is instrumental in a wide variety of phenomena in solid state physics, such as electrical resistivity in metals [1], carrier mobility, optical transition and polaron effects in semiconductors [2,3], lifetime of hot
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