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Josephson junction devices: Model q...

Chen, Josephine.

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Josephson junction devices: Model quantum mechanical systems and medical applications.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Josephson junction devices: Model quantum mechanical systems and medical applications./
Author:	Chen, Josephine.
Description:	134 p.
Notes:	Source: Dissertation Abstracts International, Volume: 64-09, Section: B, page: 4429.
Contained By:	Dissertation Abstracts International64-09B.
Subject:	Physics, Electricity and Magnetism. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3105182
ISBN:	0496527492

Josephson junction devices: Model quantum mechanical systems and medical applications.
Chen, Josephine.

Josephson junction devices: Model quantum mechanical systems and medical applications. - 134 p.

Source: Dissertation Abstracts International, Volume: 64-09, Section: B, page: 4429.

Thesis (Ph.D.)--University of California, Berkeley, 2003.

In this dissertation, three experiments using Josephson junction devices are described. In Part I, the effect of dissipation on tunneling between charge states in a superconducting single-electron transistor (sSET) was studied. The sSET was fabricated on top of a semi-conductor heterostructure with a two-dimensional electron gas (2DEG) imbedded beneath the surface. The 2DEG acted as a dissipative ground plane. The sheet resistance of the 2DEG could be varied in situ by applying a large voltage to a gate on the back of the substrate. The zero-bias conductance of the sSET was observed to increase with increasing temperature and 2DEG resistance. Some qualitative but not quantitative agreement was found with theoretical calculations of the functional dependence of the conductance on temperature and 2DEG resistance.

ISBN: 0496527492Subjects--Topical Terms:

1019535
Physics, Electricity and Magnetism.

Josephson junction devices: Model quantum mechanical systems and medical applications.
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020 $a 0496527492
035 $a (UnM)AAI3105182
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040 $a UnM $c UnM
100 1 $a Chen, Josephine. $3 1926304
245 1 0 $a Josephson junction devices: Model quantum mechanical systems and medical applications.
300 $a 134 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-09, Section: B, page: 4429.
500 $a Chair: John Clarke.
502 $a Thesis (Ph.D.)--University of California, Berkeley, 2003.
520 $a In this dissertation, three experiments using Josephson junction devices are described. In Part I, the effect of dissipation on tunneling between charge states in a superconducting single-electron transistor (sSET) was studied. The sSET was fabricated on top of a semi-conductor heterostructure with a two-dimensional electron gas (2DEG) imbedded beneath the surface. The 2DEG acted as a dissipative ground plane. The sheet resistance of the 2DEG could be varied in situ by applying a large voltage to a gate on the back of the substrate. The zero-bias conductance of the sSET was observed to increase with increasing temperature and 2DEG resistance. Some qualitative but not quantitative agreement was found with theoretical calculations of the functional dependence of the conductance on temperature and 2DEG resistance.
520 $a Part II describes a series of experiments performed on magnesium diboride point-contact junctions. The pressure between the MgB2 tip and base pieces could be adjusted to form junctions with different characteristics. With light pressure applied between the two pieces, quasiparticle tunneling in superconductor-insulator-superconductor junctions was measured. From these data, a superconducting gap of approximately 2 meV and a critical temperature of 29 K were estimated. Increasing the pressure between the MgB2 pieces formed junctions with superconductor-normal metal-superconductor characteristics. We used these junctions to form MgB2 superconducting quantum interference devices (SQUIDS). Noise levels as low as 35 fT/Hz1/2 and 4 muphi 0/Hz1/2 at 1 kHz were measured.
520 $a In Part III, we used a SQUID-based instrument to acquire magnetocardiograms (MCG), the magnetic field signal measured from the human heart. We measured 51 healthy volunteers and 11 cardiac patients both at rest and after treadmill exercise. We found age and sex related differences in the MCG of the healthy volunteers that suggest that these factors should be considered when evaluating the MCG for disease. We also defined a spatio-temporal MCG parameter, the repolarization stabilization interval, which successfully discriminated our patients from our healthy controls.
590 $a School code: 0028.
650 4 $a Physics, Electricity and Magnetism. $3 1019535
650 4 $a Engineering, Biomedical. $3 1017684
650 4 $a Biophysics, Medical. $3 1017681
690 $a 0607
690 $a 0541
690 $a 0760
710 2 0 $a University of California, Berkeley. $3 687832
773 0 $t Dissertation Abstracts International $g 64-09B.
790 1 0 $a Clarke, John, $e advisor
790 $a 0028
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3105182