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Novel techniques towards nuclear spi...

Houck, Andrew A.

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Novel techniques towards nuclear spin detection.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Novel techniques towards nuclear spin detection./
作者:	Houck, Andrew A.
面頁冊數:	204 p.
附註:	Source: Dissertation Abstracts International, Volume: 66-05, Section: B, page: 2642.
Contained By:	Dissertation Abstracts International66-05B.
標題:	Physics, Condensed Matter. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3173928
ISBN:	0542113759

Novel techniques towards nuclear spin detection.
Houck, Andrew A.

Novel techniques towards nuclear spin detection. - 204 p.

Source: Dissertation Abstracts International, Volume: 66-05, Section: B, page: 2642.

Thesis (Ph.D.)--Harvard University, 2005.

Measurement of small numbers of nuclear spins remains an important scientific problem, with potential applications in medical imaging and quantum computation. Significant progress will likely require novel techniques rather than incremental improvements of existing technology. Two possibilities are explored in this thesis: using materials with a negative index of refraction (NIM) to image nuclear spins, and using molecular electronics to probe single nuclear spins.

ISBN: 0542113759Subjects--Topical Terms:

1018743
Physics, Condensed Matter.

Novel techniques towards nuclear spin detection.
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245 1 0 $a Novel techniques towards nuclear spin detection.
300 $a 204 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-05, Section: B, page: 2642.
500 $a Advisers: Charles M. Marcus; Isaac L. Chuang.
502 $a Thesis (Ph.D.)--Harvard University, 2005.
520 $a Measurement of small numbers of nuclear spins remains an important scientific problem, with potential applications in medical imaging and quantum computation. Significant progress will likely require novel techniques rather than incremental improvements of existing technology. Two possibilities are explored in this thesis: using materials with a negative index of refraction (NIM) to image nuclear spins, and using molecular electronics to probe single nuclear spins.
520 $a The first approach was to use NIM lenses for non-local detection of a nuclear magnetic resonance signal. Two experiments were used to confirm the existence of artificially-structured NIM at X-band microwave frequencies. First, a Snell's Law refraction experiment measured the deflection of a microwave beam at an air-NIM interface. Second, direct phase measurements indicated a negative phase velocity inside the material.
520 $a Flat slab NIM lenses were used to focus radiation from a point source. Frequency and size dependence were consistent with theoretical predictions, and qualitative features of the transmission profile were consistent with numerical simulations. However, sub-wavelength resolution was not attained, due to material loss and inhomogeneity; significant engineering challenges must be overcome before these materials are useful for spin detection.
520 $a The second approach to spin detection used electronic transport through single molecules; for an electron tightly bound to an atom with strong hyperfine coupling, Coulomb blockade spectroscopy could resolve nuclear spin levels. However, fabrication of single molecule transistors remains beyond the limit of conventional lithography. In this thesis, an actively-controlled electromigration process was developed for generating electrode pairs with atomic-scale separation with 70% yield.
520 $a Transport measurements on bare gold junctions revealed a surprising result: localized states that gave rise to the Kondo effect exist even in the absence of deposited molecules. Atomic-scale gold grains are the most likely source of these states. Controls for single molecule experiments are therefore inconclusive, making spin detection difficult. However, this system is well-suited for studying the Kondo effect in the presence of competing spin effects; for example, dilute magnetic impurities were introduced in the leads, splitting the Kondo resonance at zero magnetic field.
590 $a School code: 0084.
650 4 $a Physics, Condensed Matter. $3 1018743
650 4 $a Physics, Electricity and Magnetism. $3 1019535
650 4 $a Physics, Molecular. $3 1018648
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710 2 0 $a Harvard University. $3 528741
773 0 $t Dissertation Abstracts International $g 66-05B.
790 1 0 $a Marcus, Charles M., $e advisor
790 1 0 $a Chuang, Isaac L., $e advisor
790 $a 0084
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3173928