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53. Two-photon magneto-optical transitions in quantum rings.

Author

Phuc, Huynh V.

Subjects
*QUANTUM rings, *QUANTUM transitions, *AHARONOV-Bohm effect, *QUANTUM numbers, *MAGNETIC flux
Abstract

We study the effect of the magnetic and Aharonov–Bohm (AB) flux fields on the two-photon absorption (2PA) in a quantum ring (QR) system. The expression of 2PA coefficient is expressed through the two-photon transition probability including both intraband and interband transitions. The effect of the polarization orientation of the incident light breaks the symmetry from the contribution between the AB flux field and the azimuthal quantum number. Magnetic and AB flux fields have a significant effect on the electronic properties of the QR. The 2PA spectra for intraband transitions are in the THz range and have a much higher magnitude compared to those for interband transitions, which are located in the near-infrared range. The increase in the magnetic field results in a blue-shift of the 2PA spectra for both intraband and interband transitions, whereas changes in the azimuthal quantum number only affect the spectra for interband transitions. [ABSTRACT FROM AUTHOR]

Published
2023
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74. PCDA™ SLAM-BASED TECHNOLOGY FOR POINT CLOUD AND TRAJECTORY OPTIMIZATION FOR AIRBORNE, LAND, AND INDOOR APPLICATIONS IN GNSS-DENIED ENVIRONMENTS

Author

Mostafa, M. M. R., Sever, M., Huynh, V., Jaeger, N., Jarvis, A., Hutton, J., and Kurz, S.

Abstract

This paper presents the results of assessing the performance of Trimble Applanix PCDA™ SLAM-based technology to simultaneously optimize any mobile mapping system trajectory and LiDAR point cloud data in a GNSS-denied environment. The simultaneous use of inertially-aided GNSS data along with LiDAR point clouds to optimally correct shifts and/or drifts in the trajectory in GNSS-denied environments is addressed in detail in this paper. A number of Trimble MX50 Mobile Mapping System data sets were acquired in Germany particularly to assess the performance of PCDA™. The land mobile mapping data sets were acquired in deep urban canyons which were purposely acquired that way to reach the most challenging land mobile mapping data sets in a GNSS-denied environment. The PCDA™ technology assessment results are presented in detail. In summary, the results show how LiDAR data can successfully be used to correct the trajectory shifts and drifts due to GNSS outages by simultaneously optimizing both point cloud and trajectory data.

Published
2023

89. Two-dimensional Janus MGeSiP4 (M = Ti, Zr, and Hf) with an indirect band gap and high carrier mobilities: first-principles calculations

Author

Nguyen T. Hiep, Nguyen P. Q. Anh, Huynh V. Phuc, Cuong Q. Nguyen, Nguyen N. Hieu, and Vo T. T. Vi

Subjects
General Physics and Astronomy, Physical and Theoretical Chemistry
Abstract

New 2D Janus MGeSiP4 (M = Ti, Zr or Hf) monolayers are successfully designed and their crystal lattices, stabilities, and electronic and transport properties are systematically investigated via first-principles calculations based on density functional theory.

Published
2023

99. Reconstitution of the 30-nm chromatin fiber

Author

Huynh, V.

Subjects
572.8
Abstract

This thesis describes the production of folded and regular 30-nm chromatin fibers reconstituted from purified components of DNA tandem repeats, histone octamer, and H5. Obtaining evenly spaced nucleosome arrays saturated with H5 is feasible with the use an artificially derived sequence with a high affinity for histone octamer. This artificial "sequence 601" positions the nucleosome specifically and uniquely. Folding of the 30-nm chromatin fiber requires that each DNA repeat (200 bp) be found or saturated with exactly one histone octamer and one H5. The basis of the reconstitution system presented in this thesis is the addition of mixed sequence competitor (or carrier) DNA which allows the reconstitution to be fully controlled. A combination of techniques including bandshift assays, restriction enzyme digestion, and electron microscopy are used to analyze the regularity and fully saturated nature of the reconstituted chromatin. The reconstituted chromatin arrays are shown to fold to form compact 30-nm chromatin particles as visualized by electron microscopy. The results suggest that a DNA fragment containing at least 19 tandem 200 bp 601 repeats (200-19mer) is required to produce stably folded particles as 200-12mer DNA repeats did not show sufficient stability. Analysis by cryoelectron microscopy showed that the reconstitution of 200-19mer DNA repeats resulted in both single chromatin particles and oligomerized chromatin fibers. Furthermore, the reconstituted chromatin fibers have a morphology similar to that of native chromatin fibers with the exception of appearing to be more regular (as desired). The production of regular chromatin fibers is a critical step towards the structural determination of the 30-nm chromatin fiber. Furthermore, these folded and reconstituted chromatin fibers provide the ideal substrate to address future questions of the role of higher order chromatin structure in biological processes.

Published
2002

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