Mika Oksanen

Stamp Transferred Suspended Graphene Mechanical Resonators for Radio Frequency Electrical Readout

We present a simple micromanipulation technique to transfer suspended graphene flakes onto any substrate and to assemble them with small localized gates into mechanical resonators. The mechanical motion of the graphene is detected using an electrical, radio frequency (RF) reflection readout scheme where the time-varying graphene capacitor reflects a RF carrier at f = 5-6 GHz producing modulation sidebands at f ± f(m). A mechanical resonance frequency up to f(m) = 178 MHz is demonstrated. We find both hardening/softening Duffing effects on different samples and obtain a critical amplitude of ~40 pm for the onset of nonlinearity in graphene mechanical resonators. Measurements of the quality factor of the mechanical resonance as a function of dc bias voltage V(dc) indicates that dissipation due to motion-induced displacement currents in graphene electrode is important at high frequencies and large V(dc).

Contact doping, Klein tunneling, and asymmetry of shot noise in suspended graphene

The inherent asymmetry of the electric transport in graphene is attributed to Klein tunneling across barriers defined by

Buckled diamond-like carbon nanomechanical resonators.

\textit{pn}

Terahertz detection using mechanical resonators based on 2D materials

-interfaces between positively and negatively charged regions. By combining conductance and shot noise experiments we determine the main characteristics of the tunneling barrier (height and slope) in a high-quality suspended sample with Au/Cr/Au contacts. We observe an asymmetric resistance

Electron–Phonon Coupling in Suspended Graphene: Supercollisions by Ripples

R_{\textrm{odd}}=100-70

Single-mode and multimode Fabry-Pérot interference in suspended graphene

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Coupling between electrons and optical phonons in suspended bilayer graphene

across the Dirac point of the suspended graphene at carrier density

Päällystettävien betonirakenteiden kuivumiskyky vaihtelevissa olosuhteissa, rakentamistavoissa ja rakenneratkaisuissa

|n_{\rm G}|=0.3-4 \cdot 10^{11}

Electronic transport and mechanical resonance modes in graphene

cm