Publications by authors named "Anudeep Mangu"
Hidden domain boundary dynamics toward crystalline perfection.
Proc Natl Acad Sci U S A
January 2025
A central paradigm of nonequilibrium physics concerns the dynamics of heterogeneity and disorder, impacting processes ranging from the behavior of glasses to the emergent functionality of active matter. Understanding these complex mesoscopic systems requires probing the microscopic trajectories associated with irreversible processes, the role of fluctuations and entropy growth, and the timescales on which nonequilibrium responses are ultimately maintained. Approaches that illuminate these processes in model systems may enable a more general understanding of other heterogeneous nonequilibrium phenomena, and potentially define ultimate speed and energy cost limits for information processing technologies.
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- Strong coupling between polarization and strain in ferroelectric complex oxides allows for significant tuning of their properties, particularly demonstrated in KNbO thin films.
- Applying biaxial strain can drastically increase the Curie temperature, with predictions indicating it could exceed 1325 K under certain conditions.
- Enhanced properties such as a 46% increase in remanent polarization and a 200% boost in optical second harmonic generation coefficients make lead-free KNbO a promising candidate for high-temperature ferroelectric memory and quantum computing applications.
Article Synopsis
- Ultrafast stimuli can create stable states of matter that can't be achieved under normal conditions, highlighting the need to understand the relationship between ultrafast processes and these states.
- The study uses advanced optical and X-ray techniques to observe how a polar vortex supercrystal forms in a specially designed material when it's excited by light, demonstrating various phases in just a few picoseconds.
- Over time, fluctuations in the structure of the supercrystal are gradually eliminated, leading to the stable formation of a single vortex supercrystal phase, with theoretical models supporting these observations.
The development of many quantum optical technologies depends on the availability of single quantum emitters with near-perfect coherence. Systematic improvement is limited by a lack of understanding of the microscopic energy flow at the single-emitter level and ultrafast timescales. Here we utilize a combination of fluorescence correlation spectroscopy and ultrafast spectroscopy to capture the sample-averaged dynamics of defects with single-particle sensitivity.
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