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Transport phenomena in molecular-sca...

Keane, Zachary.

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Transport phenomena in molecular-scale devices.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Transport phenomena in molecular-scale devices./
Author:	Keane, Zachary.
Description:	106 p.
Notes:	Source: Dissertation Abstracts International, Volume: 71-09, Section: B, page: 5530.
Contained By:	Dissertation Abstracts International71-09B.
Subject:	Condensed matter physics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3421152
ISBN:	9781124199719

Transport phenomena in molecular-scale devices.
Keane, Zachary.

Transport phenomena in molecular-scale devices. - 106 p.

Source: Dissertation Abstracts International, Volume: 71-09, Section: B, page: 5530.

Thesis (Ph.D.)--Rice University, 2009.

This item must not be sold to any third party vendors.

The physics of atomic-scale systems is a subject of considerable interest, from both a basic-science and an engineering standpoint. We discuss three sets of experiments, each designed to elucidate a particular aspect of nanoscale physics. The first of these aspects is spin-dependent transport in atomic-scale ferromagnetic wires. Early reports of large magnetoresistive effects in this type of device led to speculation about possible mechanisms for enhancing spin polarization in ferromagnetic constrictions, as well as excitement about the potential applications for such an effect. An experiment carefully designed to exclude other mechanisms for conductance changes, however, leads us to conclude that there is no evidence for a large magnetoresistive effect per se in constricted ferromagnetic wires.

ISBN: 9781124199719Subjects--Topical Terms:

3173567
Condensed matter physics.

Transport phenomena in molecular-scale devices.
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020 $a 9781124199719
035 $a (MiAaPQ)AAI3421152
035 $a AAI3421152
040 $a MiAaPQ $c MiAaPQ
100 1 $a Keane, Zachary. $3 3175361
245 1 0 $a Transport phenomena in molecular-scale devices.
300 $a 106 p.
500 $a Source: Dissertation Abstracts International, Volume: 71-09, Section: B, page: 5530.
500 $a Adviser: Douglas Natelson.
502 $a Thesis (Ph.D.)--Rice University, 2009.
506 $a This item must not be sold to any third party vendors.
506 $a This item must not be added to any third party search indexes.
520 $a The physics of atomic-scale systems is a subject of considerable interest, from both a basic-science and an engineering standpoint. We discuss three sets of experiments, each designed to elucidate a particular aspect of nanoscale physics. The first of these aspects is spin-dependent transport in atomic-scale ferromagnetic wires. Early reports of large magnetoresistive effects in this type of device led to speculation about possible mechanisms for enhancing spin polarization in ferromagnetic constrictions, as well as excitement about the potential applications for such an effect. An experiment carefully designed to exclude other mechanisms for conductance changes, however, leads us to conclude that there is no evidence for a large magnetoresistive effect per se in constricted ferromagnetic wires.
520 $a A second area of interest is hysteretic conductance switching in single-molecule transistors incorporating bipyridyl dinitro oligo(phenylene ethynylene) dithiol (BPDN-DT). An early hypothesis to explain the observed hysteresis involved strong electron-vibration coupling leading to shifts in molecular energy levels. A change in the charge state of the molecule could both lead to a change in the conductance across the molecule and tend to stabilize the charge on the molecule, leading to hysteretic switching behavior. To examine this hypothesis, we fabricated and measured three-terminal devices allowing us to control the charge on the molecule independent of the source-drain bias. We find that the evidence argues against a charge-transfer-based mechanism for the conductance switching; instead, it is more likely that a change in the molecule-electrode coupling is responsible for this behavior.
520 $a The final area addressed in this dissertation is that of current-dependent electronic noise in single molecules. In many nanoscale devices, the discrete nature of the carriers of electric current leads to fluctuations about the average current; these fluctuations are known as shot noise. Correlations between the charge carriers can change the dependence of the magnitude of this shot noise on the value of the average current. One of the best-known examples of a correlated-electron effect in single-molecule conductance is the Kondo effect. Theorists have predicted that a single-molecule transistor in the Kondo state would exhibit significantly enhanced shot noise. We discuss the experimental challenges in making single molecule noise measurements, as well as possible techniques to address these challenges.
590 $a School code: 0187.
650 4 $a Condensed matter physics. $3 3173567
650 4 $a Nanotechnology. $3 526235
690 $a 0611
690 $a 0652
710 2 $a Rice University. $3 960124
773 0 $t Dissertation Abstracts International $g 71-09B.
790 $a 0187
791 $a Ph.D.
792 $a 2009
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3421152