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13 papers
Gas permeation through graphdiyne-based nanoporous membranes
Zhihua Zhou, Yongtao Tan, Qian Yang +20
Nanoporous membranes based on two dimensional materials are predicted to provide highly selective gas transport in combination with extreme permeability. Here we investigate membra…
Pressure-induced superconductivity in weak topological insulator BiSe
Pallavi Malavi, Arpita Paul, Achintya Bera +6
Quasi-two-dimensional layered BiSe, a natural super-lattice with Bi2Se3-Bi2-Bi2Se3 units, has recently been predicted to be a dual topological insulator, simultaneously weak topolo…
Can we use time-resolved measurements to get Steady-State Transport data for Halide perovskites?
Igal Levine, Satyajit Gupta, Achintya Bera +10
Time-resolved, pulsed excitation methods are widely used to deduce optoelectronic properties of semiconductors, including now also Halide Perovskites (HaPs), especially transport p…
Enhanced Raman and photoluminescence response in monolayer MoS due to laser healing of defects
Achintya Bera, D V S Muthu, A K Sood
Bound quasiparticles, negatively charged trions and neutral excitons, are associated with the direct optical transitions at the K-points of the Brillouin zone for monolayer MoS…
Pressure-dependent Semiconductor to Semimetal and Lifshitz transitions in 2H-MoTe: Raman and First-principles studies
Achintya Bera, Anjali Singh, D V S Muthu +2
High pressure Raman spectroscopy of bulk 2H-MoTe upto 29 GPa is shown to reveal two phase transitions (at 6 and 16.5 GPa), which are analyzed using first-principl…
Pressure-induced phase transition in BiSe at 3 GPa: electronic topological transition or not?
Achintya Bera, Koushik Pal, D V S Muthu +2
In recent years, a low pressure transition around P 3 GPa exhibited by the AB-type 3D topological insulators is attributed to an electronic topological transition (E…
Insights into vibrational and electronic properties of MoS using Raman, photoluminescence and transport studies
Achintya Bera, A. K. Sood
We review vibrational and electronic properties of single and a few layer MoS relevant to understand their resonant and non-resonant Raman scattering results. In particular, th…
Sharp Raman Anomalies and Broken Adiabaticity at a Pressure Induced Transition from Band to Topological Insulator in Sb2Se3
Achintya Bera, Koushik Pal, D. V. S. Muthu +4
The nontrivial electronic topology of a topological insulator is thus far known to display signatures in a robust metallic state at the surface. Here, we establish vibrational anom…
Symmetry-dependent phonon renormalization in monolayer MoS2 transistor
Biswanath Chakraborty, Achintya Bera, D. V. S. Muthu +3
Strong electron-phonon interaction which limits electronic mobility of semiconductors can also have significant effects on phonon frequencies. The latter is the key to the use of R…
Superconducting Fluctuations and Anomalous Phonon Renormalization much above superconducting transition temperature in Ca4Al2O5.7Fe2As2
Pradeep Kumar, A. Bera, D. V. S. Muthu +3
Raman studies on Ca4Al2O5.7Fe2As2 superconductor in the temperature range of 5 K to 300 K, covering the superconducting transition temperature Tc ~ 28.3 K, reveal that the Raman mo…
Coupled Phonons, Magnetic Excitations and Ferroelectricity in AlFeO3: Raman and First-principles Studies
Pradeep Kumar, A. Bera, D. V. S. Muthu +7
We determine the nature of coupled phonons and magnetic excitations in AlFeO3 using inelastic light scattering from 5 K to 315 K covering a spectral range from 100-2200 cm-1 and co…
Raman Evidence for Superconducting Gap and Spin-Phonon Coupling in Superconductor Ca(Fe0.95Co0.05)2As2
Pradeep Kumar, Achintya Bera, D. V. S. Muthu +8
Inelastic light scattering studies on single crystal of electron-doped Ca(Fe0.95Co0.05)2As2 superconductor, covering the tetragonal to orthorhombic structural transition as well as…
Raman signatures of pressure induced electronic topological and structural transitions in Bi2Te3
Gopal K. Pradhan, Achintya Bera, Pradeep Kumar +2
We report Raman signatures of electronic topological transition (ETT) at 3.6 GPa and rhombohedral (α-Bi2Te3) to monoclinic (β-Bi2Te3) structural transition at ~ 8 GPa. At the onset…