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Papers

Published research papers. Full listing also available on my Google Scholar profile.

Special-Character Adversarial Attacks on Open-Source Language Model

Ephraiem S. Sarabamoun

arXiv preprint, 2025

Examines how large language models can be compromised through character-level manipulations. Evaluates seven open-source models ranging from 3.8B to 32B parameters against over 4,000 attack attempts using unicode, homoglyph, structural, and textual encoding attacks aimed at bypassing safety mechanisms.

Photoluminescence Switching in Quantum Dots Connected with Carboxylic Acid and Thiocarboxylic Acid End-Group Diarylethene Molecules

Ephraiem S. Sarabamoun, Pramod Aryal, Jonathan M. Bietsch, Maurice Curran, Sugandha Verma, Grayson Johnson, Lucy U. Yoon, Amelia G. Reid, Esther H. R. Tsai, Charles W. Machan, Christopher Paolucci, Guijun Wang, Joshua J. Choi

The Journal of Physical Chemistry C, 128(48), 20599-20608, 2024

Demonstrates that quantum dots cross-linked with carboxylic acid end group molecules exhibit greater photoluminescence switching intensity compared to thiocarboxylic acid end group variants, with greater switching observed for smaller quantum dots.

Synthesis of Bis-Thioacid Derivatives of Diarylethene and Their Photochromic Properties

Pramod Aryal, Jonathan M. Bietsch, Gowri Sankar Grandhi, Richard Chen, Surya B. Adhikari, Ephraiem S. Sarabamoun, Joshua J. Choi, Guijun Wang

ACS Omega, 9(48), 47489-47499, 2024

Synthesizes four thioacid-functionalized diarylethene derivatives exhibiting reversible photoswitching and photochromic properties upon UV and visible light treatment, with demonstrated applications as colorimetric sensors in agarose hydrogels.

Photoluminescence switching in quantum dots connected with fluorinated and hydrogenated photochromic molecules

Ephraiem S. Sarabamoun, Jonathan M. Bietsch, Pramod Aryal, Amelia G. Reid, Maurice Curran, Grayson Johnson, Esther H. R. Tsai, Charles W. Machan, Guijun Wang, Joshua J. Choi

RSC Advances, 14, 424-432, 2024

Examines how photoluminescence in lead sulfide quantum dots can be switched using hydrogenated and fluorinated photochromic diarylethene bridge molecules, finding that hydrogenated molecules exhibit greater photoluminescence switching due to differences in energy level barriers.

Quantum-Dot-Doped Lead Halide Perovskites for Ionizing Radiation Detection

Ashley M. Conley, Ephraiem S. Sarabamoun, K. A. Dagnall, Lucy U. Yoon, H. S. Rajeev, Seung-Hun Lee, Joshua J. Choi

ACS Applied Optical Materials, 2023

Investigates the use of quantum-dot-doped lead halide perovskites as scintillators for ionizing radiation detection.

Exciton Dissociation in Quantum Dots Connected with Photochromic Molecule Bridges

Lucy U. Yoon, Surya B. Adhikari, Ephraiem S. Sarabamoun, Jonathan M. Bietsch, Esther H. R. Tsai, Guijun Wang, Joshua J. Choi

Journal of Materials Chemistry C, 9, 16006-16013, 2021

Demonstrates how photochromic molecules can be used as bridges connecting quantum dots to modulate exciton dissociation dynamics. Switching the configuration of photochromic molecules changes the inter-QD potential barrier height, affecting charge tunneling and exciton dissociation pathways.

Solitons in the Einstein universe

Eugene B. Kolomeisky, Ephraiem Sarabamoun

Physical Review D, 101, 043515, 2020

Shows that equations of Newtonian hydrodynamics and gravity with Einstein's cosmological constant admit gravitostatic wave solutions propagating in the background of Einstein's static Universe. Solitary wave solutions emerge at precisely the Einstein Universe density, with soliton lattices appearing at marginally higher densities.


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