Sökning: "tunable resonances"

Visar resultat 1 - 5 av 8 avhandlingar innehållade orden tunable resonances.

  1. 1. Modeling a carbon-nanotube-based nanoelectromechanical relay

    Författare :Magnus Jonsson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; surface forces; NEMS; carbon nanotubes; dissipation; nanorelay; mechanical resonances; stiction; high frequency applications; Nanoelectromechanical systems; field emission; tunable resonances;

    Sammanfattning : We have theoretically investigated the properties of a three-terminal carbon-nanotube-based nanoelectromechanical relay. The system operationis based on an coupling between electrical and mechanical degrees of freedom which is a typical characteristic of a NEMS device. LÄS MER

  3. 2. Three-body Universality Controlled by a Feshbach Resonance

    Författare :Kajsa-My Tempest; Svante Jonsell; Doerte Blume; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Efimov states; few-body systems; ultracold atoms; van der Waals interaction; Feshbach resonances; universality; computational studies; Theoretical Physics; teoretisk fysik;

    Sammanfattning : The quantum Efimov effect manifests itself in the limit of resonant two-body interactions, where the scattering length diverges. In this scenario, an infinite number of shallow bound trimer states are formed with binding energies that obey a discrete geometric scaling law. LÄS MER

  4. 3. Microscopic Theory of Externally Tunable Exciton Signatures of Two-Dimensional Materials

    Författare :Maja Feierabend; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; localized states; density matrix formalism; magnetic field; transition metal dichalcogenides; Bloch equations; organic inorganic heterostructures; dark excitons; strain;

    Sammanfattning : Atomically thin transition metal dichalcogenides (TMDs) are in the focus of current research due to their efficient light-matter interaction and the remarkably strong Coulomb interaction that leads to tightly bound excitons. Due to their unique band structure, TMDs show a variety of bright and optically inaccessible dark excitonic states. LÄS MER

  5. 4. Theoretical studies of collective electronic excitations in low-dimensional structures

    Författare :Zhe Yuan; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; linear atomic chains; hydrogen storage; nanodisks; dielectric response; surface plasmon resonances; electron gas model; electronic excitation; metallic thin films; time-dependent density functional theory;

    Sammanfattning : During the past decade, nanoplasmonics and nanophotonicshas emerged as a new branch of nanosciences with many novelapplications. Central in this development is the localized surface plasmon resonance (LSPR) tunable by the sizes and shapes at nanometer scale. LÄS MER

  7. 5. Slow propagation line-based superconducting devices for quantum technology

    Författare :Astghik Adamyan; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; superconducting transmission line; electron spin resonance; parametric amplifier; near field scanning microwave microscopy; tunable microstrip resonator;

    Sammanfattning : In the field of circuit quantum electrodynamics (c-QED), the coherent interaction of two-level systems (TLSs) with photons, confined in a superconducting microwaveresonator, opens up new possibilities for quantum computing experiments.This thesis contributes to the expansion of c-QED tool-box with slow propagation line-based solutions for ubiquitous techniques, such as cryogenic Near Field Scanning Microwave Microscopy (NSMM), Electron Spin Resonance (ESR) spectroscopy and Traveling Wave Parametric Amplifier (TWPA). LÄS MER