Arnab Bera
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View article: Signatures of emergent surface states across a displacive topological phase transition in Bi$_4$I$_4$
Signatures of emergent surface states across a displacive topological phase transition in Bi$_4$I$_4$ Open
Topological phase transitions involving crystalline symmetry breaking provide a fertile ground to explore the interplay between symmetry, topology, and emergent quantum phenomena. Recently discovered quasi-one-dimensional topological mater…
View article: Revisiting MnSe : a Magnetic Semiconductor with Spin-Phonon coupling
Revisiting MnSe : a Magnetic Semiconductor with Spin-Phonon coupling Open
Spin-phonon interactions in 2D magnetic materials are crucial in advancing next-generation spintronic devices. Therefore, identifying new materials with significant spin-phonon interactions is of great importance. In this context, MnSe, pr…
View article: Nonlinear Optical Properties of 2D vdW Ferromagnetic Nanoflakes for Magneto‐Optical Logic Applications
Nonlinear Optical Properties of 2D vdW Ferromagnetic Nanoflakes for Magneto‐Optical Logic Applications Open
2D magnetic materials are garnering significant interest due to their high carrier mobilities, valley pseudospins, tunable bandgaps, and novel spin textures enabling exciting opportunities to explore unique nonlinear optical phenomena and …
View article: Barrier height inhomogeneity and origin of 1/f-noise in topological insulator-based photo-detector
Barrier height inhomogeneity and origin of 1/f-noise in topological insulator-based photo-detector Open
Topological insulators (TIs) with symmetry-protected surface states, offer exciting opportunities for next-generation photonic and optoelectronic device applications. The heterojunctions of TIs and semiconductors (e.g. Si, Ge) have been ob…
View article: Exceptionally Slow, Long Range, and Non-Gaussian Critical Fluctuations Dominate the Charge Density Wave Transition
Exceptionally Slow, Long Range, and Non-Gaussian Critical Fluctuations Dominate the Charge Density Wave Transition Open
$(TaSe_4)_2I$ is a well-studied quasi-one-dimensional compound long-known to have a charge-density wave (CDW) transition around 263 K. We argue that the critical fluctuations of the pinned CDW order parameter near the transition can be inf…
View article: Anomalous Hall effect induced by Berry curvature in topological nodal-line van der Waals ferromagnet Fe$_4$GeTe$_2$
Anomalous Hall effect induced by Berry curvature in topological nodal-line van der Waals ferromagnet Fe$_4$GeTe$_2$ Open
The exploration of nontrivial transport phenomena associated with the interplay between magnetic order and spin-orbit coupling (SOC), particularly in van der Waals (vdW) systems has gained a resurgence of interest due to their easy exfolia…
View article: Raman signatures of lattice dynamics across inversion symmetry breaking phase transition in quasi-1D compound, (TaSe$_4$)$_3$I
Raman signatures of lattice dynamics across inversion symmetry breaking phase transition in quasi-1D compound, (TaSe$_4$)$_3$I Open
Structural phase transition can occur due to complex mechanisms other than simple dynamical instability, especially when the parent and daughter structure is of low dimension. This article reports such an inversion symmetry-breaking struct…
View article: Centrosymmetric-noncentrosymmetric Structural Phase Transition in Quasi one-dimensional compound, (TaSe$_4$)$_3$I
Centrosymmetric-noncentrosymmetric Structural Phase Transition in Quasi one-dimensional compound, (TaSe$_4$)$_3$I Open
(TaSe$_4$)$_3$I, a compound belonging to the family of quasi-one-dimensional transition-metal tetrachalcogenides, has drawn significant attention due to a recent report on possible coexistence of two antagonistic phenomena, superconductivi…
View article: Enhanced coercivity and emergence of spin cluster glass state in 2D ferromagnetic material Fe3GeTe2
Enhanced coercivity and emergence of spin cluster glass state in 2D ferromagnetic material Fe3GeTe2 Open
Two-dimensional (2D) van der Waals (vdW) magnetic materials with high coercivity and high $T_\text{C}$ are desired for spintronics and memory storage applications. Fe$_3$GeTe$_2$ (F3GT) is one such 2D vdW ferromagnet with a reasonably high…
View article: A Rare Case Mimicking Pleural Effusion
A Rare Case Mimicking Pleural Effusion Open
Congenital diaphragmatic eventration is a common condition in infancy but a rare anomaly in adults.The association of this condition with a wandering spleen in the thoracic cavity is even rare.Here we report a case of total congenital even…
View article: Nonlinear Coherent Light–Matter Interaction in 2D MoSe<sub>2</sub> Nanoflakes for All‐Optical Switching and Logic Applications
Nonlinear Coherent Light–Matter Interaction in 2D MoSe<sub>2</sub> Nanoflakes for All‐Optical Switching and Logic Applications Open
A strong nonlinear optical response of 2D MoSe 2 nanoflakes (NFs) through spatial self‐phase modulation (SSPM) and cross‐phase modulation (XPM) induced by nonlocal coherent light–matter interactions is reported. The coherent interaction of…
View article: Incidental diagnosis of medullary thyroid carcinoma due to persistently elevated procalcitonin in a patient with COVID-19 pneumonia: A case report
Incidental diagnosis of medullary thyroid carcinoma due to persistently elevated procalcitonin in a patient with COVID-19 pneumonia: A case report Open
Persistently elevated Pct levels can occur in any pro-inflammatory state including infections, sepsis, or acute respiratory distress syndrome. In the current setting, SARS-CoV-2 infection is one such clinical scenario, and in rare situatio…
View article: Revisiting the magnetic ordering through anisotropic magnetic entropy change in quasi-two-dimensional metallic ferromagnet, Fe$_4$GeTe$_2$
Revisiting the magnetic ordering through anisotropic magnetic entropy change in quasi-two-dimensional metallic ferromagnet, Fe$_4$GeTe$_2$ Open
We have investigated the nature of ferromagnetic order and phase transitions in two dimensional (2D) van der Waals (vdW) layered material, Fe$_4$GeTe$_2$ through measurements of magnetization, magneto-caloric Effect (MCE), and heat capacit…
View article: Superconductivity coexisting with ferromagnetism in a quasi-one dimensional non-centrosymmetric (TaSe4)3I
Superconductivity coexisting with ferromagnetism in a quasi-one dimensional non-centrosymmetric (TaSe4)3I Open
Low-dimensional materials with broken inversion symmetry and strong spin-orbit coupling can give rise to fascinating quantum phases and phase transitions. Here we report coexistence of superconductivity and ferromagnetism below 2.5 K in th…
View article: Superconductivity coexisting with ferromagnetism in a quasi-one dimensional non-centrosymmetric (TaSe$_4$)$_3$I
Superconductivity coexisting with ferromagnetism in a quasi-one dimensional non-centrosymmetric (TaSe$_4$)$_3$I Open
Low-dimensional materials with broken inversion symmetry and strong spin-orbit coupling can give rise to fascinating quantum phases and phase transitions. Here we report coexistence of superconductivity and ferromagnetism below 2.5\,K in t…
View article: Colossal electroresistance response accompanied by metal-insulator transition in a mixed-valent vanadate
Colossal electroresistance response accompanied by metal-insulator transition in a mixed-valent vanadate Open
Colossal electroresistance (CER) in manganites, i.e., a large change in\nelectrical resistance under the influence of either an applied electric field\nor an applied electric current, has often been described as complimentary to\nthe colos…
View article: Comparative Study on Outcome of Non-invasive Ventilation in Patients with Acute Exacerbation of COPD Admitted in General Ward vs. High Dependency Unit
Comparative Study on Outcome of Non-invasive Ventilation in Patients with Acute Exacerbation of COPD Admitted in General Ward vs. High Dependency Unit Open
Introduction: Non-Invasive Ventilation (NIV) is getting popularity in management of acute exacerbation of COPD with hypercapnic respiratory failure because of its effectiveness. However, there is still a dilemma regarding the site of initi…