Publications by authors named "A Pasupathy"
A ferroelectric material often exhibits a soft transverse optical (TO) phonon mode which governs its phase transition. Charge coupling to this ferroelectric soft mode may further mediate emergent physical properties, including superconductivity and defect tolerance in semiconductors. However, direct experimental evidence for such coupling is scarce.
View Article and Find Full Text PDFGraphene is a privileged 2D platform for hosting confined light-matter excitations known as surface plasmon polaritons (SPPs), as it possesses low intrinsic losses and a high degree of optical confinement. However, the isotropic nature of graphene limits its ability to guide and focus SPPs, making it less suitable than anisotropic elliptical and hyperbolic materials for polaritonic lensing and canalization. Here, we present graphene/CrSBr as an engineered 2D interface that hosts highly anisotropic SPP propagation across mid-infrared and terahertz energies.
View Article and Find Full Text PDFThe discovery of superconductivity in twisted bilayer and trilayer graphene has generated tremendous interest. The key feature of these systems is an interplay between interlayer coupling and a moiré superlattice that gives rise to low-energy flat bands with strong correlations. Flat bands can also be induced by moiré patterns in lattice-mismatched and/or twisted heterostructures of other two-dimensional materials, such as transition metal dichalcogenides (TMDs).
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- Noncentrosymmetric two-dimensional superconductors like few-layer T_{d}-MoTe_{2} exhibit unique superconducting properties, including upper critical fields exceeding the Pauli limit by up to 600%.
- The enhancement of these properties is still debated, with theories suggesting influences from either spin-orbit parity coupling or tilted Ising spin-orbit coupling.
- In bilayer T_{d}-MoTe_{2}, experiments show superconductivity has a twofold symmetry influenced by magnetic and electric fields, and findings support tilted Ising spin-orbit coupling as the main mechanism.
Article Synopsis
- Researchers studied neuron organization in the macaque monkey's area V4, focusing on shape and texture selectivity using advanced Neuropixels probes on two awake monkeys.
- They found that about 20% of neurons formed clusters with similar tuning, but these clusters were limited to specific layers rather than showing a columnar structure throughout the cortex.
- The findings suggest that area V4's organization prioritizes broader stimulus categories and spatial scales, opposed to fine-tuned columnar arrangements seen in the primary visual cortex, highlighting the complexity of input integration in mid-level visual processing.