Blar i Institutt for fysikk på utgivelsesdato
Viser treff 161-180 av 2677
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Spin and Charge Transport in Two-dimensional Electron Gases
(Doktoravhandlinger ved NTNU, 1503-8181; 2010:200, Doctoral thesis, 2010)With the continuing demand for miniaturisation from the electronics industry, it becomes increasingly important to understand the physical behaviour of nanometre sized conductors. State-of-the-art transistors have typical ... -
Femtosecond Operation and Random Quasi-Phase-Matched Self-Doubling of Ceramic Cr:ZnSe Laser
(Chapter, 2010)A 100-fs Cr:ZnSe laser, based on a ceramic active medium, generates 100 mW at 215 MHz repetition rate around 2450 nm. Co-propagating second-harmonic pulse at 1225 nm is simultaneously generated due to random quasi-phase-matching ... -
Soliton absorption spectroscopy in normal-dispersion lasers
(Chapter, 2010)An all-normal-dispersion oscillator with narrowband intracavity absorption acquires spectral features which follow the index of refraction of the absorber, as confirmed by experimental obsevation. Compared to the conventional ... -
Triplet supercurrent due to spin-active zones in a Josephson junction
(Journal article; Peer reviewed, 2010)Motivated by a recent experiment evidencing triplet superconductivity in a ferromagnetic Josephson junction with a Cu2MnAl-Heusler barrier, we construct a theoretical model accounting for this observation. The key ingredients ... -
Ultrabroad Continuous-Wave Tuning of Ceramic Cr:ZnSe and Cr:ZnS Lasers
(Chapter, 2010)Using a single set of optics, we demonstrate ultrabroad tuning over more than 1300 nm from 1973 to 3349 nm in Cr:ZnSe and from 1962 to 3195 nm in Cr:ZnS at <10 GHz linewidth. -
Mid-infrared dual-comb spectroscopy with 2.4 mu m Cr2+:ZnSe femtosecond lasers
(Journal article, 2010)The mid-infrared part of the electromagnetic spectrum is the so-called molecular fingerprint region because gases have tell-tale absorption features associated with molecular rovibrations. This region can be for instance ... -
Theoretical studies of the intermidiate band solar cell
(Doktoravhandlinger ved NTNU, 1503-8181; 2010:94, Doctoral thesis, 2010)This thesis presents theoretical work on the intermediate band solar cell (IBCS). It is divided into two main parts: The first part is an introduction to basic solar cell physics and a presentation of central parts of the ... -
Competition on the Rocks: Community Growth and Tessellation
(Journal article; Peer reviewed, 2010)Crustose lichen communities on rocks exhibit fascinating spatial mosaics resembling political maps of nations or municipalities. Although the establishment and development of biological populations are important themes in ... -
Spin-polarized Josephson current in superconductor/ferromagnet/superconductor junctions with inhomogeneous magnetization
(Journal article; Peer reviewed, 2010)We study numerically the properties of spin transport and charge transport in a current-biased nanoscale diffusive superconductor/ferromagnet/superconductor junction when the magnetization texture is nonuniform. Specifically, ... -
En studie av samspillet mellom YouTube-videoer og samarbeidslæring
(Master thesis, 2010)I denne oppgaven har jeg sett på hvordan bruk av YouTube-videoer i samspill medsamarbeidslæring kan benyttes i fysikkundervisningen, og hvilken betydning det kan ha for elevenes læringsutbytte. Jeg argumenterer for at ... -
Phase-controlled proximity effect in ferromagnetic Josephson junctions: Calculation of the density of states and the electronic specific heat
(Journal article; Peer reviewed, 2010)We study the thermodynamic properties of a dirty ferromagnetic S|F|S Josephson junction with s-wave superconducting leads in the low-temperature regime. We employ a full numerical solution with a set of realistic parameters ... -
Pure spin current generated by reflection at a normal metal/two-dimensional electron gas interface
(Journal article; Peer reviewed, 2010)The concept of a spin current is a useful tool in understanding spin transport in hybrid systems but its very definition is problematic in systems where spin-orbit coupling effects are strong. In the absence of spin-dependent ... -
Majorana fermions manifested as interface states in semiconductor hybrid structures
(Journal article; Peer reviewed, 2010)Motivated by recent proposals for the generation of Majorana fermions in semiconducting hybrid structures, we examine possible experimental fingerprints of such excitations. Whereas previous works mainly have focused on ... -
2.4 μm dual-comb spectroscopy
(Chapter, 2010)A proof-of-principle experiment of mid-infrared frequency comb Fourier transform spectroscopy is carried out with two interfering Cr2+:ZnSe femtosecond oscillators, emitting around 2400 nm. Spectra of acetylene are measured ... -
Pore-scale modelling of two-phase flow: dynamic effects and electrical response
(Doktoravhandlinger ved NTNU, 1503-8181; 2010:222, Doctoral thesis, 2010) -
Faceted interfacial structure of {1011} twins in Ti formed during equal channel angular pressing
(Journal article; Peer reviewed, 2010)The boundary structure of {1011} deformation twins formed in commercial pure titanium (CP-Ti) during the initial pass ECAP processing has been studied by TEM and HRTEM. A new twining mode with twinning dislocation of b3/3, ... -
Signature of odd-frequency pairing correlations induced by a magnetic interface
(Journal article; Peer reviewed, 2010)We investigate the mutual proximity effect in a normal metal contacted to a superconductor through a magnetic interface. Analytical and self-consistent numerical results are presented, and we consider both the diffusive ... -
Electronic structure of thermoelectric and ferro-electric materials: - Advanced transmission electronmicroscopy studies
(Doktoravhandlinger ved NTNU, 1503-8181; 2010:158, Doctoral thesis, 2010)This thesis describes TEM studies related to the electronic structure of thermoelectric and ferroelectric materials. Compounds within the thermoelectric skutterudite class of materials were examined using Electron ... -
Dark matter candidates and their indirect detection
(Doktoravhandlinger ved NTNU, 1503-8181; 2010:152, Doctoral thesis, 2010)