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Leburton, Jean-Pierre Nagaraja, Satyadev Hulikal 2015-09-25T20:10:30Z 2015-09-25T20:10:30Z 10000-01-01 1999 1999 By expanding the model to incorporate electron spin under the Local Spin Density Approximation, the charging properties of the double quantum dot are investigated in terms of electron spin and interdot interaction. It is shown that both electrostatic and quantum mechanical coupling between the dots affect the charging properties. For weak interdot coupling, simultaneous or double charging of the two constituent dots occurs, as seen in recent experiments by Waugh and co-workers [2]. It is argued that the double charging model may be used to explain the phenomenon of pair tunneling in vertical dots observed by Ashoori et al. [3]. It is also shown that a spin polarized state can be realized for weak interdot coupling, with four electrons in each dot, a situation explained in terms of Hund's rules. Lastly, it is shown that a ferromagnetic-like state can be obtained for three electrons in the double-dot by varying the interdot coupling strength. As the interdot barrier is lowered, the pz states in the two dots couple to form a bonding state that is delocalized over both. For small energy spacing between the 1 s and the bonding states, the ground state for three electrons has an electron in the 1s state of each dot and the delocalized pz bonding state, with the spins of all the electrons aligned parallel. Made available in DSpace on 2015-09-25T20:10:30Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 9953098.pdf: 3677659 bytes, checksum: 628f38ca66c06eecdccd1b9ab83dfe71 (MD5) Previous issue date: 1999 Embargo set by: Seth Robbins for item 82592 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 67 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1999. http://hdl.handle.net/2142/81311 (MiAaPQ)AAI9953098 eng Physics, Condensed Matter Simulation of Single -Electron Charging Effects in Planar Nanoscale Devices text Electrical Engineering Electrical Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.