search query: @keyword non-equiblirium / total: 1
reference: 1 / 1
« previous | next »
Author:Kauppila, Ville
Title:Temperature and Quasiparticle Fluctuations in Superconductors
Lämpötila- ja kvasihiukkasfluktuaatiot suprajohteissa
Publication type:Master's thesis
Publication year:2012
Pages:ii + 48      Language:   eng
Department/School:Teknillisen fysiikan laitos
Main subject:Fysiikka   (Tfy-3)
Supervisor:Pelkola, Jukka
Instructor:Heikkilä, Tero
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
Instructions

Reading digital theses in the closed network of the Aalto University Harald Herlin Learning Centre

In the closed network of Learning Centre you can read digital and digitized theses not available in the open network.

The Learning Centre contact details and opening hours: https://learningcentre.aalto.fi/en/harald-herlin-learning-centre/

You can read theses on the Learning Centre customer computers, which are available on all floors.

Logging on to the customer computers

  • Aalto University staff members log on to the customer computer using the Aalto username and password.
  • Other customers log on using a shared username and password.

Opening a thesis

  • On the desktop of the customer computers, you will find an icon titled:

    Aalto Thesis Database

  • Click on the icon to search for and open the thesis you are looking for from Aaltodoc database. You can find the thesis file by clicking the link on the OEV or OEVS field.

Reading the thesis

  • You can either print the thesis or read it on the customer computer screen.
  • You cannot save the thesis file on a flash drive or email it.
  • You cannot copy text or images from the file.
  • You cannot edit the file.

Printing the thesis

  • You can print the thesis for your personal study or research use.
  • Aalto University students and staff members may print black-and-white prints on the PrintingPoint devices when using the computer with personal Aalto username and password. Color printing is possible using the printer u90203-psc3, which is located near the customer service. Color printing is subject to a charge to Aalto University students and staff members.
  • Other customers can use the printer u90203-psc3. All printing is subject to a charge to non-University members.
Location:P1 Ark Aalto  17   | Archive
Keywords:nanoelectronics
temperature
fluctuations
non-equiblirium
superconductor
heat transport
lämpötila
nanoelektroniikka
fluktuaatiot
epätasapaino
suprajohde
lämmönkuljetus
Abstract (eng): The field of nanoelectronics has gained significant interest in the past decades.
Now that the field has matured, new questions such as the role of heat transport and fluctuations in these nanostructures have become interesting.

Superconducting materials are often used as building blocks in nanoelectronic systems.
Examples include superconducting qubits, ultrasensitive radiation detectors, nanosized thermometers and single-electron transistors.
In all of these applications, stochastic fluctuations of physical observables such as electric and heat current, temperature and number of quasiparticles play a mostly harmful role since they inhibit the desired behaviour of these devices.

In this thesis, I extend previous work done on out of equilibrium thermodynamic fluctuations in different kinds of nanoelectronic devices.
I study the temperature, energy, and quasiparticle fluctuations in a superconductor coupled to an environment which can either be phonons of the lattice or a normal metal electric circuit.
I review the theory used in the calculations and apply it to this system.
I study different limits such as the ones where the environment is at a very low temperature or close to the transition temperature of the superconductor.
Abstract (fin): Nanoelektroniikka tieteenalana on viime vuosikymmeninä saavuttanut valtavan suosion.
Nyt kun ala on kypsynyt, uudenlaiset kysymykset kuten lämmönsiirto ja fluktuaatiot nanorakenteissa ovat tulleet kiinnostaviksi.

Suprajohtavia materiaaleja käytetään usein rakennuspalikoina nanoelektroniikan laitteissa.
Esimerkkejä ovat suprajohtavat kubitit, herkät säteilynilmaisimet, nanokokoiset lämpömittarit ja yksielektronitransistorit.
Kaikissa näissä sovelluksissa fysikaalisten suureiden, kuten virran, lämpötilan ja kvasihiukkaslukumäärän fluktuaatiot ovat merkittävässä osassa sillä ne rajoittavat laitteiden toimintaa.

Tässä työssä laajennan aiempaa tutkimusta termodynaamisista fluktuaatioista erilaisissa nanoelektroniikan laitteissa epätasapainotilassa.
Tutkin lämpötilan, energian ja kvasihiukkaslukumäärän fluktuaatioita suprajohteessa, joka on kytketty ympäristöön.
Ympäristönä toimivat joko fononit tai normaalista, ei-suprajohtavasta metallista tehdyt johtimet osana piiriä.
Käyn läpi aiheeseen kuuluvan teorian ja sovellan sitä näiden systeemien tutkimiseen.
Tutkin fluktuaatioita eri parametrialueilla, erityisesti matalassa lämpötilassa ja kriittistä lämpötilaa lähellä olevassa lämpötilassa.
ED:2012-12-19
INSSI record number: 45725
+ add basket
« previous | next »
INSSI