Publications by authors named "H Chakraborti"
Article Synopsis
- Graphene has become a key material for electron optical experiments, showing advantages over traditional two-dimensional electron gases, such as high mobility and precise electrostatic control for creating gap-less p-n interfaces.
- These interfaces can host unique particle states and are crucial for building complex electron devices like interferometers, leveraging features like the Dirac spectrum and Berry phase.
- The review covers the theoretical foundations, fabrication methods, and simulation techniques for graphene electron optics, along with analysis of ballistic transport experiments and current advancements in devices like Mach-Zender and Fabry-Perot interferometers.
Flying qubits encode quantum information in propagating modes instead of stationary discrete states. Although photonic flying qubits are available, the weak interaction between photons limits the efficiency of conditional quantum gates. Conversely, electronic flying qubits can use Coulomb interactions, but the weaker quantum coherence in conventional semiconductors has hindered their realization.
View Article and Find Full Text PDFWe report the development of a portable absorption (PortAbs)-based pathogen nucleic acid detection system using peptide nucleic acid (PNA) and a cyanine dye, DiSc(5). When the dye binds to the PNA-DNA hybrid, it results in a characteristic ∼110 nm shift in the dye absorbance, which we measure using PortAbs. The protocol involves amplification of the target DNA, PNA-DNA hybridization and dye complexing steps followed by absorption measurement.
View Article and Find Full Text PDFGiant first hyperpolarizabilities of donor-acceptor substituted graphyne: An ab initio study.
Spectrochim Acta A Mol Biomol Spectrosc
January 2016
Graphyne (Gy), a theoretically proposed material, has been utilized, for the first time, in a phenomenal donor-Gy-acceptor (D-Gy-A) structure to plan a superior nonlinear optical material. Owing to the extraordinary character of graphyne, this conjugate framework shows strikingly extensive static first hyperpolarizability (β(tot)) up to 128×10(-30) esu which is an enormous improvement than that of the bare graphyne. The donor-acceptor separation plays a key role in the change of β(tot) value.
View Article and Find Full Text PDFArticle Synopsis
- The study investigates how reduced graphene oxide (rGO) affects the fluorescence of 1-aminopyrene (1-Ap) using advanced spectroscopic techniques.
- Despite some unexpected trends in the data, the consistent absorption spectrum of 1-Ap and the decrease in its fluorescence lifetime suggest that the quenching is a dynamic process driven by electron transfer.
- Computational findings indicate that electron transfer occurs between 1-Ap and rGO, with minimal π-π stacking interactions, confirming the experimental results regarding their electronic interactions.