274 citations · 2.1k across the 64 of their papers we have counts for
29 papers · 1 filter
Charge-Density-Wave Phase Transitions in Monolayer 1T-TaS2 from Universal Machine Learning Molecular Dynamics
Valentina Nesterova, Tribhuwan Pandey, Tom Berlijn +3
Charge-density-wave (CDW) phases in 1T transition-metal dichalcogenides arise from strong electron-phonon coupling and accompanying lattice instabilities. Capturing their temperatu…
Angle-Resolved Cryogenic Brillouin-Mandelstam Spectroscopy of Surface and Bulk Acoustic Phonons in Diamond
Jordan Teeter, Dylan Wright, Nidhish Thiruthukkal Puthenveettil +2
We used angle-resolved Brillouin-Mandelstam light-scattering spectroscopy to monitor surface and bulk acoustic phonons in diamond along the <100> and <110> crystallographic directi…
Phonon Signatures of Near-Room-Temperature Phase Transition in Quasi-One-Dimensional Bi4I4 Topological van der Waals Material
Nidhish Thiruthukkal Puthenveettil, Topojit Debnath, Clayton Mantz +7
The quasi-one-dimensional material Bi4I4 hosts two crystallographically similar polymorphs that realize distinct topological insulating phases separated by a first-order structural…
Anomalous spin-lattice coupling in a 2D antiferromagnetic semiconductor revealed by surface acoustic Rayleigh waves
Zahra Ebrahim Nataj, Md. Sabbir Hossen Bijoy, Vladislav Korostelev +5
Magnetic order in van der Waals magnets can strongly influence their lattice dynamics, yet how this interaction manifests across different phonon length scales remains unclear. Opt…
Acoustic Phonon Characteristics of Gallium Oxide Single Crystals Investigated with Brillouin-Mandelstam Light Scattering Spectroscopy
Dylan Wright, Erick Guzman, Md. Sabbir Hossen Bijoy +5
We report an investigation of the bulk and surface acoustic phonons in gallium oxide ultra-wide bandgap single crystals along various crystallographic directions using Brillouin-Ma…
First-principles study of structural, electronic and optical properties of non-toxic RbBaX (X = F, Cl, Br, I) perovskites under hydrostatic pressure
Pranti Saha, In Jun Park, Protik Das +1
We have investigated the structural, mechanical, electronic and optical properties of Rb-based cubic perovskite RbBaX (X = F, Cl, Br, I) under hydrostatic pressure, using first…
Acoustic and Optical Phonon Frequencies and Acoustic Phonon Velocities in Silicon-Doped Aluminum Nitride Thin Films
Dylan Wright, Dinusha Herath Mudiyanselage, Erick Guzman +6
We report the results of the study of the acoustic and optical phonons in Si-doped AlN thin films grown by metalorganic chemical vapor deposition on sapphire substrates. The Brillo…
Solution-Processed Inks with Fillers of NbS Quasi-One-Dimensional Charge-Density-Wave Material
Tekwam Geremew, Maedeh Taheri, Nicholas Sesing +4
We report on the solution processing and testing of electronic ink comprised of quasi-one-dimensional NbS charge-density-wave fillers. The ink was prepared by liquid-phase exfo…
Acoustic and Optical Phonons in Quasi-Two-Dimensional MPX3 Van der Waals Semiconductors
Dylan Wright, Zahra Ebrahim Nataj, Erick Guzman +4
We report the results of the investigation of the acoustic and optical phonons in quasi-two-dimensional antiferromagnetic semiconductors of the transition metal phosphorus trisulfi…
Strong Temperature Dependence of Thermal Conductivity in High-Purity Cubic Boron Arsenide
Songrui Hou, Fengjiao Pan, Xinping Shi +11
Materials with high thermal conductivity are needed to conduct heat away from hot spots in high power electronics and optoelectronic devices. Cubic boron arsenide (c-BAs) has a hig…
Electronic Noise Spectroscopy of Quasi-2D van der Waals Antiferromagnetic Semiconductors
Subhajit Ghosh, Zahra Ebrahim Nataj, Fariborz Kargar +1
We investigated low-frequency current fluctuations, i.e. electronic noise, in FePS3 van der Waals, layered antiferromagnetic semiconductor. The noise measurements have been used as…
Phonon States in NbTe and TaTe Quasi-One-Dimensional van der Waals Crystals
Zahra Ebrahim Nataj, Fariborz Kargar, Sergiy Krylyuk +7
We report the results of polarization-dependent Raman spectroscopy of phonon states in single-crystalline quasi-one-dimensional NbTe and TaTe van der Waals materials. The m…
Optical and Acoustic Phonons in Turbostratic and Cubic Boron Nitride Thin Films on Diamond Substrates
Erick Guzman, Fariborz Kargar, Avani Patel +6
We report an investigation of the bulk optical, bulk acoustic, and surface acoustic phonons in thin films of turbostratic boron nitride (t-BN) and cubic boron nitride (c-BN) grown…
Quantum Composites with the Functionality Defined by the Charge-Density-Wave Phase Transitions
Zahra Barani, Tekwam Geremew, Megan Stokey +7
We demonstrate a unique class of advanced materials - quantum composites based on polymers with fillers comprised of a van der Waals quantum material that reveals multiple charge-d…
Cryogenic Characteristics of Graphene Composites -- Evolution from Thermal Conductors to Thermal Insulators
Zahra Ebrahim Nataj, Youming Xu, Jonas Brown +4
The development of cryogenic semiconductor electronics and superconducting quantum computing requires composite materials that can provide both thermal conduction and thermal insul…
The Effects of Boron Doping on the Bulk and Surface Acoustic Phonons in Single-Crystal Diamond
Erick Guzman, Fariborz Kargar, Frank Angeles +7
We report the results of the investigation of bulk and surface acoustic phonons in the undoped and boron-doped single-crystal diamond films using the Brillouin-Mandelstam light sca…
Charge-Density-Wave Devices Printed with the Ink of Chemically Exfoliated 1T-TaS Fillers
Saba Baraghani, Zahra Barani, Yassamin Ghafouri +5
We report on the preparation of inks containing fillers derived from quasi-two-dimensional charge-density-wave materials, their application for inkjet printing, and the evaluation…
Low-Frequency Noise Characteristics of GaN Vertical PIN Diodes -- Effects of Current and Temperature
Subhajit Ghosh, Kai Fu, Fariborz Kargar +3
We report low-frequency noise characteristics of vertical GaN PIN diodes, focusing on the effects of the diode design, current and temperature. The as-grown and regrown diodes, wit…
Metallic vs. Semiconducting Properties of Quasi-One-Dimensional Tantalum Selenide van der Waals Nanoribbons
Fariborz Kargar, Andrey Krayev, Michelle Wurch +7
We conducted a tip-enhanced Raman scattering spectroscopy (TERS) and photoluminescence (PL) study of quasi-1D TaSe3 nanoribbons exfoliated onto gold substrates. At a selenium defic…
Phonon modes and Raman signatures of MnBi2nTe3n+1 (n=1,2,3,4) magnetic topological heterostructures
Yujin Cho, Jin Ho Kang, Liangbo Liang +8
An intrinsic antiferromagnetic topological insulator can be realized by intercalating Mn-Te bilayer chain in a topological insulator, . $\m…
Low-Frequency Electronic Noise Spectroscopy of Quasi-2D van der Waals Antiferromagnetic Semiconductors
Subhajit Ghosh, Fariborz Kargar, Amirmahdi Mohammadzadeh +2
We investigated low-frequency current fluctuations, i.e. noise, in the quasi-two-dimensional (2D) van der Waals antiferromagnetic semiconductor FePS3 with the electronic bandgap of…
Electromagnetic-Polarization Selective Composites with Quasi-1D van der Waals Metallic Fillers
Zahra Barani, Fariborz Kargar, Yassamin Ghafouri +5
We report on the preparation of flexible polymer composite films with aligned metallic fillers comprised of atomic chain bundles of the quasi-one-dimensional (1D) van der Waals mat…
Phonon and Thermal Properties of Quasi-Two-Dimensional FePS3 and MnPS3 Antiferromagnetic Semiconductor Materials
Fariborz Kargar, Ece Aytan, Subhajit Ghosh +9
We report results of investigation of the phonon and thermal properties of the exfoliated films of layered single crystals of antiferromagnetic FePS3 and MnPS3 semiconductors. The…
Brillouin-Mandelstam Spectroscopy of Stress-Modulated Spatially Confined Spin Waves in Ni Thin Films on Piezoelectric Heterostructures
Fariborz Kargar, Michael Balinskiy, Howard Chiang +5
We report results of micro-Brillouin-Mandelstam light scattering spectroscopy of thermal magnons in the two-phase synthetic multiferroic structure consisting of a piezoelectric (PM…