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Development of a Thulium Fiber Laser for an Atomic Spectroscopy Experiment
This article is a simplified analysis of a convenient thulium fiber laser source with 3 W of output power operating at a wavelength of 2059 nm with a slope efficiency of 49% with respect to input pump power and 60% with respect to absorbed pump power. The laser was applied in an atomic helium spectroscopy experiment to quench ³He (2058.63 nm) and ⁴He (2058.69 nm) meta-stable singlets (2¹S0), allowing for further investigation of the helium fine structure.
Date:
February 15, 2020
Creator:
Currey, Ronnie; Khademian, Ali & Shiner, David
System:
The UNT Digital Library
Generation of over 1000 Diffraction Spots from 2D Graded Photonic Super-Crystals
Discusses a project in which researchers were able to generate over 1000 diffraction spots from a graded photonic super-crystal with a unit super-cell size of 12a × 12a where a is the lattice constant and hole radii are gradually changed in dual directions.
Date:
April 10, 2020
Creator:
Hassan, Safaa; Jiang, Yan; Alnasser, Khadijah; Hurley, Noah; Zhang, Hualiang; Philipose, Usha et al.
System:
The UNT Digital Library
High-Throughput Computational Search for Half-Metallic Oxides
The article describes a high-throughput computational search for half-metallic compounds. The analysis of calculated electronic properties of thousands of materials from the inorganic crystal structure database allowed the authors to identify potential half metals. They found over two-hundred strong half-metallic oxides; several of them have never been reported before.
Date:
April 25, 2020
Creator:
Liyanage, Laalitha S. I.; Slawińska, Jagoda; Gopal, Priya; Curtarolo, Stefano; Fornari, Marco & Buongiorno Nardelli, Marco
System:
The UNT Digital Library
Topological View of Flows Inside the BOLD Spontaneous Activity of the Human Brain
Article describes study which found that persistent, recurring blood oxygen level dependent (BOLD) signals in triangulated rs-fMRI videoframes display previously undetected topological findings, i.e., vortex structures that cover brain activated regions.
Date:
April 22, 2020
Creator:
Don, Arjuna P. H.; Peters, James F.; Ramanna, Sheela & Tozzi, Arturo
System:
The UNT Digital Library
A resonant single frequency molecular detector with high sensitivity and selectivity for gas mixtures
Article theoretically demonstrates a single low frequency gas detector that can be used for sensing of gas mixtures with high selectivity, accuracy, and sensitivity.
Date:
January 30, 2020
Creator:
Branković, Zorica & Rostovtsev, Yuri V.
System:
The UNT Digital Library
Spin Hall effect in prototype Rashba ferroelectrics GeTe and SnTe
Article describes study investigating spin Hall effect (SHE) in two prototypical Ferroelectric Rashba semiconductors (FERSCs), GeTe and SnTe, and show that it can be large either in ferroelectric or paraelectric structure.
Date:
January 24, 2020
Creator:
Wang, Haihang; Gopal, Priya; Picozzi, Silvia; Curtarolo, Stefano; Buongiorno Nardelli, Marco & Sławińska, Jagoda
System:
The UNT Digital Library
Closed-form expressions for the magnetic fields of rectangular and circular finite-length solenoids and current loops
This article discusses closed-form expressions for the magnetic fields produced by rectangular- and circular-shaped finite-length solenoids and current loops. The closed-form expression for the magnetic field of a rectangular-shaped finite-length solenoid is derived using the Biot–Savart law. Closed-form expressions for the magnetic fields of solenoids and current loops can be used to avoid approximations in analytical models and may reduce computation time in computer simulations.
Date:
June 15, 2020
Creator:
Hampton, S.; Lane, R. A.; Hedlof, R. M.; Phillips, R. E. & Ordonez, Carlos A.
System:
The UNT Digital Library
A Review of Diagnostics Methodologies for Metal Additive Manufacturing Processes and Products
This article is a review summarizing and discussing various ex-situ inspections and in-situ monitoring methods, including electron-based methods, thermal methods, acoustic methods, laser breakdown, and mechanical methods, for metal additive manufacturing.
Date:
August 30, 2021
Creator:
Yang, Teng; Mazumder, Sangram; Jin, Yuqi; Squires, Brian; Sofield, Matthew; Pantawane, Mangesh V. et al.
System:
The UNT Digital Library
Advanced modeling of materials with PAOFLOW 2.0: New features and software design
This article describes the recent re-design of the code and the new features and improvements in performance of PAOFLOW, a software tool that constructs tight-binding Hamiltonians from self-consistent electronic wavefunctions by projecting onto a set of atomic orbitals.
Date:
September 2, 2021
Creator:
Cesaroli, Frank T.; Supka, Andrew; Jayaraj, Anooja; Costa, Marcio; Siloi, Ilaria; Sławińska, Jagoda et al.
System:
The UNT Digital Library
Crystallographic texture dependent bulk anisotropic elastic response of additively manufactured Ti6Al4V
This article identifies a bulk texture effect on elastic anisotropy in laser powder bed fused Ti6Al4V by employing an effective bulk modulus elastography technique coupled with ultrasound shear wave velocity measurement at a frequency of 20 MHz inside the material.
Date:
January 12, 2021
Creator:
Pantawane, Mangesh V.; Yang, Teng; Jin, Yuqi; Joshi, Sameehan; Dasari, Sriswaroop; Sharma, Abhishek et al.
System:
The UNT Digital Library
Simulation of the formation of antihydrogen via magnetobound positronium
This article simulates Antihydrogen formation involving magnetobound positronium by computing classical trajectories.
Date:
September 9, 2021
Creator:
Aguirre, F. F. & Ordonez, Carlos A.
System:
The UNT Digital Library
Resonance modes in moiré photonic patterns for twistoptics
Article studying twistoptics for manipulating optical properties in twisted moiré photonic patterns without physical rotations. The presented approach can lead toward the study of twistoptics for the manipulating of optical properties in moiré patterns with different twist angles.
Date:
April 12, 2021
Creator:
Alnasser, Khadijah; Kamau, Steve; Cui, Jingbiao & Lin, Yuankun
System:
The UNT Digital Library
Discovery of higher-order topological insulators using the spin Hall conductivity as a topology signature
This article shows a connection between spin Hall effect and HOTIs using a combination of ab initio calculations and tight-binding modeling. The model demonstrates how a non-zero bulk midgap spin Hall conductivity (SHC) emerges within the HOTI phase. This work guides novel experimental and theoretical advances towards higher-order topological insulator realization and applications.
Date:
April 12, 2021
Creator:
Costa, Marcio; Mera Acosta, Carlos; Padilha, Antonio C.M.; Cerasoli, Frank T.; Buongiorno Nardelli, Marco & Fazzio, Adalberto
System:
The UNT Digital Library
Topologically driven linear magnetoresistance in helimagnetic FeP
Article presenting a series of high magnetic field experiments on high-quality single crystals of FeP. The study shows that resistance not only increases without saturation by up to several hundred times its zero-field value by 35 T, but that it also exhibits an anomalously linear field dependence over the entire range when the field is aligned precisely along the crystallographic c-axis.
Date:
April 14, 2021
Creator:
Campbell, D.J.; Collini, J.; Sławińska, Jagoda; Autieri, C.; Wang, L.; Wang, K. et al.
System:
The UNT Digital Library
Acoustic Metasurface-Aided Broadband Noise Reduction in Automobile Induced by Tire-Pavement Interaction
Article demonstrating a technique utilizing acoustic metasurfaces (AMSes) with high reflective characteristics using relatively lightweight materials for noise reduction without any change in mechanical strength or weight of the tire. The proposed design can significantly reduce the noise arising from tire–pavement interaction over a broadband of acoustic frequencies under 1000 Hz and over a wide range of vehicle speeds using a negative effective dynamic mass density approach.
Date:
July 30, 2021
Creator:
Heo, Hyeonu; Sofield, Matthew; Ju, Jaehyung & Neogi, Arup
System:
The UNT Digital Library
Adaptation of Fluctuating Magnetoacoustic System to External Signals
Article studying the influence of microwave signals of different shapes on the magnetoacoustic wave system with a giant nonlinearity in canted antiferromagnet FeBO₃ at room temperature, which is close to its phase transition to the paramagnetic state. Results represent the first observation of the macroscopic quantum statistical phenomenon, Bose-Einstein condensation of magnetoacoustic wave quanta in a wave system with a high level of thermal fluctuations.
Date:
June 2, 2021
Creator:
Safonov, Vladimir L.; Bas, Derek A.; Berman, Diana; Rostovtsev, Yuri V.; Roberts, James A.; Mcconney, Michael E. et al.
System:
The UNT Digital Library
Broadband Absorption in Patterned Metal/Weakly-Absorbing-Spacer/Metal with Graded Photonic Super-Crystal
Article studying high light absorption in two devices: a stack of Au-pattern/insulator/Au-film and a stack of Au-pattern/weakly-absorbing-material/Au-film where the Au-pattern was structured in graded photonic super-crystal. Multiple-band absorption, including one near 1500 nm, in a stack of Au-pattern/spacer/Au-film was observed.
Date:
April 8, 2021
Creator:
Kamau, Steve; Hassan, Safaa; Alnasser, Khadijah; Zhang, Hualiang; Cui, Jingbiao & Lin, Yuankun
System:
The UNT Digital Library
Chandra and Magellan/FIRE follow-up observations of PSO167–13: An X-ray weak QSO at z = 6.515
This article presents the results of follow-up observations of the z = 6.515 radio-quiet QSO PSO167–13, which is interacting with a close companion galaxy with the goal to confirm the existence of the X-ray source and to investigate the rest-frame UV properties of the QSO. The authors observed the PSO167–13 system with Chandra/ACIS-S (177 ks) and obtained new spectroscopic observations (7.2 h) with Magellan/FIRE.
Date:
May 27, 2021
Creator:
Vito, F.; Brandt, William Nielsen; Ricci, F.; Congui, E.; Connor, T.; Bañados, E. et al.
System:
The UNT Digital Library
Deep Minimum and a Vortex for Positronium Formation in Low-Energy Positron-Helium Collisions
This article finds a zero in the positronium formation scattering amplitude and a deep minimum in the logarithm of the corresponding differential cross section for positron–helium collisions for an energy just above the positronium formation threshold. Results show that there is a valley in the logarithm of the positronium formation differential cross section that includes the deep minimum and also a minimum in the forward direction.
Date:
August 6, 2021
Creator:
Alrowaily, Albandari W.; Quintanilla, Sandra J. & Van Reeth, Peter
System:
The UNT Digital Library
Disentangling Orbital and Valley Hall Effects in Bilayers of Transition Metal Dichalcogenides
This article shows that a bilayer of 2H-MoS₂ is an orbital Hall insulator that exhibits a sizeable orbital Hall effect in the absence of both spin and valley Hall effects. The results are based on density functional theory and low-energy effective model calculations and strongly suggest that bilayers of TMDs are highly suitable platforms for direct observation of the orbital Hall insulating phase in two-dimensional materials.
Date:
February 5, 2021
Creator:
Cysne, Tarik P.; Costa, Marcio; Canonico, Luis M.; Buongiorno Nardelli, Marco; Muniz, R. B. & Rappoport, Tatiana G.
System:
The UNT Digital Library
Do gene-environment interactions play a role in COVID-19 distribution? The case of Alpha-1 Antitrypsin, air pollution and COVID-19
This article evaluates the role that gene-environment interaction between air-pollution and Alpha-1 Antitrypsin (AAT) genes plays in the severity of COVID-19. Results find parallelism between the number of COVID deaths and the AAT*air pollution global risk in Europe.
Date:
May 7, 2021
Creator:
Murgia, Nicola; Corsico, Angelo Guido; D'Amato, Gennaro; Maesano, Cara Nichole; Tozzi, Arturo & Annesi-Maesano, Isabella
System:
The UNT Digital Library
Longitudinal Monostatic Acoustic Effective Bulk Modulus and Effective Density Evaluation of Underground Soil Quality: A Numerical Approach
This article introduces a novel method using longitudinal sound to detect underground soil voids to inspect underwater bed property in terms of effective bulk modulus and effective density of the material properties.
Date:
December 25, 2020
Creator:
Jin, Yuqi; Choi, Tae-Youl & Neogi, Arup
System:
The UNT Digital Library
Manufacturing and Characterization of Hybrid Bulk Voxelated Biomaterials Printed by Digital Anatomy 3D Printing
This article proposes non-destructive ultrasound effective density and bulk modulus imaging to evaluate 3D voxelated materials printed by J750 Digital Anatomy 3D Printer of Stratasys. This method provides the design map of voxelated materials and substantially broadens the applications of 3D digital printing in the clinical research area.
Date:
December 30, 2020
Creator:
Heo, Hyeonu; Jin, Yuqi; Yang, David; Wier, Christopher; Minard, Aaron; Dahotre, Narendra B. et al.
System:
The UNT Digital Library
Dielectric function of six elemental metals
This article presents an accurate first-principles study of the electronic structure and absorption spectrum of six elemental metals (aluminium, gold, silver, copper, palladium, platinum) using density functional theory in an all-electron full-potential framework.
Date:
December 2020
Creator:
Pogodaeva, Maria K.; Levchenko, Sergey; Drachev, Vladimir P. & Gabitov, Ildar R.
System:
The UNT Digital Library