Transport in nanoscale systems
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2003.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2007
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| Online Access: | http://hdl.handle.net/1721.1/39403 |
| _version_ | 1826213731816701952 |
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| author | Novikov, Dmitry S., 1976- |
| author2 | Leonid S. Levitov. |
| author_facet | Leonid S. Levitov. Novikov, Dmitry S., 1976- |
| author_sort | Novikov, Dmitry S., 1976- |
| collection | MIT |
| description | Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2003. |
| first_indexed | 2024-09-23T15:53:55Z |
| format | Thesis |
| id | mit-1721.1/39403 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T15:53:55Z |
| publishDate | 2007 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/394032019-04-12T09:30:08Z Transport in nanoscale systems Novikov, Dmitry S., 1976- Leonid S. Levitov. Massachusetts Institute of Technology. Dept. of Physics. Massachusetts Institute of Technology. Dept. of Physics. Physics. Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2003. Includes bibliographical references. In part I of the Thesis charge ordering and transport in arrays of coated semiconductor nanocrystals (quantum dot arrays) are studied. Charge ordering in dot arrays is considered by mapping the electrons on the dots onto the frustrated spin model on the triangular lattice. A number of phases is identified for this system. Phase diagram is studied by means of the height field order parameter. Novel correlated fluid phase is identified, in which transport of classical charges exhibits correlated behavior. Freezing transitions into commensurate ground state configurations are found to be of the first order. A novel model of transport in disordered systems is proposed to account for experimentally observed current transients in dot arrays at high bias. This transport model yields a non-stationary response in a stationary system. The model proposes a particular power law noise spectrum that is found to be consistent with experiments. In Part II of the Thesis novel effects in Carbon nanotubes are predicted. These effects can be manifest in transport measurements. First, it is shown that a strong electric field applied perpendicularly to the tube axis can fracture the Fermi surface of metallic nanotubes and significantly reduce excitation gap in semiconducting nanotubes. The depolarization problem is linked to the chiral anomaly of 1+1 dimensional Dirac fermions. Second, coupling between a surface acoustic wave and nanotube electrons is proposed as a means to realize an adiabatic charge pump. Incompressible states are identified in the single particle picture, and the corresponding minigaps are found. Conditions for pumping experiment are identified. (cont.) Third, electron properties of a nanotube in a periodic potential are considered. It is shown that when the electron density is commensurate with the potential period, incompressible electron states exist. Electron interactions are treated in the Luttinger liquid framework, and excitation gaps corresponding to incompressible states are found using the phase soliton approach. by Dmitry S. Novikov. Ph.D. 2007-10-22T17:50:00Z 2007-10-22T17:50:00Z 2003 2003 Thesis http://hdl.handle.net/1721.1/39403 54936187 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 225 p. application/pdf Massachusetts Institute of Technology |
| spellingShingle | Physics. Novikov, Dmitry S., 1976- Transport in nanoscale systems |
| title | Transport in nanoscale systems |
| title_full | Transport in nanoscale systems |
| title_fullStr | Transport in nanoscale systems |
| title_full_unstemmed | Transport in nanoscale systems |
| title_short | Transport in nanoscale systems |
| title_sort | transport in nanoscale systems |
| topic | Physics. |
| url | http://hdl.handle.net/1721.1/39403 |
| work_keys_str_mv | AT novikovdmitrys1976 transportinnanoscalesystems |