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Ashish Tripathi
Researcher at University of California, San Diego
Publications - 5
Citations - 439
Ashish Tripathi is an academic researcher from University of California, San Diego. The author has contributed to research in topics: Ptychography & Diffraction. The author has an hindex of 5, co-authored 5 publications receiving 391 citations. Previous affiliations of Ashish Tripathi include La Trobe University.
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Journal ArticleDOI
Dichroic coherent diffractive imaging
Ashish Tripathi,Jyoti Ranjan Mohanty,Sebastian Dietze,Oleg Shpyrko,Erik Shipton,Eric E. Fullerton,Sangsoo Kim,Ian McNulty +7 more
TL;DR: In this paper, a scanned series of dichroic coherent diffraction patterns is recorded and numerically inverted to map its magnetic domain configuration, which can be extended to nonmagnetic systems that exhibit circular or linear dichroism.
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Nanoscale imaging of the electronic and structural transitions in vanadium dioxide
M. Mumtaz Qazilbash,Ashish Tripathi,Alexander Schafgans,Bong-Jun Kim,Hyun-Tak Kim,Hyun-Tak Kim,Zhonghou Cai,Martin V. Holt,J. Maser,Fritz Keilmann,Oleg Shpyrko,Dimitri Basov +11 more
TL;DR: In this article, the electronic and structural changes at the nanoscale in vanadium dioxide (VO${}_{2}$) in the vicinity of its thermally driven phase transition were investigated.
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Ptychographic overlap constraint errors and the limits of their numerical recovery using conjugate gradient descent methods
TL;DR: How reconstruction quality degrades with uncertainties in the scan positions is explored, and it is shown experimentally that large errors in the assumed scan positions on the sample can be numerically determined and corrected using conjugate gradient descent methods.
Journal ArticleDOI
Quantitative Nanoscale Imaging of Lattice Distortions in Epitaxial Semiconductor Heterostructures Using Nanofocused X-ray Bragg Projection Ptychography
Stephan O. Hruszkewycz,Martin V. Holt,Conal E. Murray,John Bruley,Judson R. Holt,Ashish Tripathi,Oleg Shpyrko,Ian McNulty,Matthew J. Highland,Paul H. Fuoss +9 more
TL;DR: This work imaged nanoscale lattice strain in a multilayer semiconductor device prototype with a new X-ray technique, nanofocused Bragg projection ptychography, and demonstrated that its internal strain profile consisted of two competing lattice distortions.
Journal ArticleDOI
Imaging local polarization in ferroelectric thin films by coherent x-ray Bragg projection ptychography.
Stephan O. Hruszkewycz,Matthew J. Highland,Martin V. Holt,Dong Jin Kim,Dong Jin Kim,Chad M. Folkman,Carol Thompson,Ashish Tripathi,G. B. Stephenson,Seungbum Hong,Seungbum Hong,Paul H. Fuoss +11 more
TL;DR: In this article, the authors used x-ray Bragg projection ptychography (BPP) to map spatial variations of ferroelectric polarization in thin film PbTiO3.