Bhupendra Karki
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View article: Scalable, Infiltration-Free Ceramic Matrix Composite Manufacturing
Scalable, Infiltration-Free Ceramic Matrix Composite Manufacturing Open
Manufacturing of ceramic matrix composites (CMCs) with carbon fiber and carbon matrix includes a time- and labor-intensive ceramic infiltration step that is responsible for more than half of the total manufacturing cost. To make CMCs cost-…
View article: Vapor-Phase Intercalation of Cesium into Black Phosphorous
Vapor-Phase Intercalation of Cesium into Black Phosphorous Open
Cesium vapors were charged into black phosphorous (BP) flakes at varied times and at a temperature gradient of 150 °C. The X-ray diffraction (XRD) measurements of these samples suggest a reduction in the strength of van der Waal interactio…
View article: Direct fabrication and characterization of vertically stacked Graphene/h-BN/Graphene tunnel junctions
Direct fabrication and characterization of vertically stacked Graphene/h-BN/Graphene tunnel junctions Open
We have used a lithography free technique for the direct fabrication of vertically stacked two-dimensional (2D) material-based tunnel junctions and characterized by Raman, AFM, XPS. We fabricated Graphene/h-BN/Graphene devices by direct de…
View article: Vibrational Properties of Pristine and Lithium‐Intercalated Black Phosphorous under High‐Pressure
Vibrational Properties of Pristine and Lithium‐Intercalated Black Phosphorous under High‐Pressure Open
Structural evolution of Li‐intercalated and pristine black phosphorous (BP) under high‐pressure (up to ≈8 GPa) is studied using in situ Raman spectroscopy. Even though both materials show a monotonic blueshift of the out‐of‐plane vibration…
View article: Nematic fluctuations in iron-oxychalcogenide Mott insulators
Nematic fluctuations in iron-oxychalcogenide Mott insulators Open
Nematic fluctuations occur in a wide range physical systems from biological molecules to cuprates and iron pnictide high- T c superconductors. It is unclear whether nematicity in pnictides arises from electronic spin or orbital degrees of …
View article: Spectroscopic Determination of Key Energy Scales for the Base Hamiltonian of Chromium Trihalides
Spectroscopic Determination of Key Energy Scales for the Base Hamiltonian of Chromium Trihalides Open
The van der Waals (vdW) chromium trihalides (CrX3) exhibit field-tunable, two-dimensional magnetic orders that vary with the halogen species and the number of layers. Their magnetic ground states with proximity in energies are sensitive to…
View article: Structural, vibrational and transport properties of novel complex systems.
Structural, vibrational and transport properties of novel complex systems. Open
Electron correlation effects in quantum materials are very strong. It is critical to investigate the structure of quantum materials to better understand and manipulate their physical properties. Quantum effects are prominent at the atomic …
View article: Structural and Thermoelectric Properties of Black Arsenic–Phosphorus
Structural and Thermoelectric Properties of Black Arsenic–Phosphorus Open
Here, we report the structural and temperature dependent transport properties of AsxP1-x (x = 0, 0.2, 0.5, 0.83, 1) alloys. It is observed that black phosphorous (BP)-related phonon modes in the alloy samples are red-shifted with increasin…
View article: Strain-induced vibrational properties of few layer black phosphorus and MoTe<sub>2</sub> via Raman spectroscopy
Strain-induced vibrational properties of few layer black phosphorus and MoTe<sub>2</sub> via Raman spectroscopy Open
We studied and compared the effect of tensile strain on the Raman spectra of black phosphorus (BP) and molybdenum ditelluride (MoTe 2 ) crystals by using a simple custom strain device. In-situ Raman spectroscopy on BP revealed clear red sh…
View article: Electrochemical Li Intercalation in Black Phosphorus: In Situ and Ex Situ Studies
Electrochemical Li Intercalation in Black Phosphorus: In Situ and Ex Situ Studies Open
A systematic study on electrochemical charge transfer in Li-doped black phosphorous (BP) was carried out by both in-situ and ex-situ Raman scattering. Galvanostatic discharge of dedicated in-situ electrochemical cell for Raman spectroscopy…
View article: Nematic Fluctuations in Iron-Oxychalcogenide Mott Insulators
Nematic Fluctuations in Iron-Oxychalcogenide Mott Insulators Open
Nematic fluctuations occur in a wide range of physical systems from liquid crystals to biological molecules to solids such as exotic magnets, cuprates and iron-based high-$T_c$ superconductors. Nematic fluctuations are thought to be closel…