2026-09-23T07:21:13Z https://www.ideals.illinois.edu/oai-pmh

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Leburton, Jean-Pierre Mason, Nadya Schulten, Klaus J. Bashir, Rashid Girdhar, Anuj 2015-07-22T22:33:35Z 2015-07-22T22:33:35Z 2017-07-23T09:15:20Z 2015-05 2015-04-24 2015-5 Over the past decade, interest in using graphene in condensed-matter physics and materials science applications has exploded, owing to its unique electrical properties. Narrow strips of graphene, called graphene nanoribbons, also display exotic behavior. A nanoribbon’s edge geometry determines its electronic transport properties, and the rich behavior of conductance of nanoribbons in response to external potentials makes them ideal for use within transistors. In this thesis, we work towards creating an accurate model of graphene nanoribbon transistors, and we asses two possible applications which exploit their amazing potential. We begin by outlining the basic theoretical and computational framework for the model developed in this work. We then demonstrate the capability of graphene nanoribbon transistors, with nanopores, to electronically detect, characterize, and manipulate translocating DNA strands. Specifically, we explore the tunability of such devices, by examining the role of lattice geometry, such as a quantum point contact constriction, on their performance. We perform a demonstration of the ability to detect the passage of double and single-stranded DNA, through molecular dynamics simulations. The transistors presented are capable of sensing the helical shape of double-stranded DNA molecules, the unraveling of a DNA helix into a planar-zipper form, and the passage of individual nucleotides of a single strand of DNA through the nanopore. We outline a preliminary analysis on the proper design of a multilayer transistor stack to control both the electronic properties of the conducting membrane, as well as the motion of the DNA. Lastly, we present another type of nanoribbon device, an all-carbon spintronic transistor for use in cascaded logic circuits. A thorough analysis of the transport properties of zigzag nanoribbon transistors in magnetic fields, in addition to the design and construction of logic gate circuits containing these spintronic transistors, is presented. Submission published under a 24 month embargo labeled 'U of I only', the embargo will last until 2017-05-01 The student, Anuj Girdhar, accepted the attached license on 2015-04-18 at 16:01. The student, Anuj Girdhar, submitted this Dissertation for approval on 2015-04-18 at 16:02. This Dissertation was approved for publication on 2015-04-24 at 10:12. DSpace SAF Submission Ingestion Package generated from Vireo submission #7936 on 2015-07-22 at 14:18:16 Made available in DSpace on 2015-07-22T22:33:35Z (GMT). No. of bitstreams: 2 GIRDHAR-DISSERTATION-2015.pdf: 31622280 bytes, checksum: ab959d673849be0b7d88d6f28e7e70d5 (MD5) LICENSE.txt: 4209 bytes, checksum: cc7e311026a1b1b5c9c80e68db3cc924 (MD5) Previous issue date: 2015-04-24 Embargo set by: Seth Robbins for item 79875 Lift date: 2017-07-22T22:34:16Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system U of I Only Restriction Lifted for Item 79875 on 2017-07-23T09:15:20Z. application/pdf http://hdl.handle.net/2142/78634 en Copyright 2015 Anuj Girdhar graphene quantum transport nanoribbon Deoxyribonucleic Acid (DNA) sequencing transistor nanopore sensing genome monolayer gate Quantum transport in graphene nanotransistors text text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.