Phase transition is a natural phenomenon happened around our daily life, represented by the process from ice to water. While melting and solidifying at a certain temperature, a high heat of fusion is accompanied, classified as the latent heat. Phase change material (PCM) has been widely applied to store and release large amount of energy attributed to the distinctive thermal behavior. Here, wit...

We evidence by numerical calculations that optically pumped graphene is suitable for compensating inherent loss in terahertz (THz) metamaterials. We calculate the complex conductivity of graphene under optical pumping and determine the proper conditions for terahertz amplification in single layer graphene. It is shown that amplification in graphene occurs up to room temperature for moderate pum...

We used large area, monolayer graphene epitaxially grown on SiC (0001) as contact electrodes for polymer nanofiber devices. Our fabrication process, which avoids polymer resist residues on the graphene surface, results in graphene-polyaniline nanofiber devices with Ohmic contacts and electrical conductivity comparable to that of Au-nanofiber devices. We further checked the thermal stability of ...

Using transient absorption (TA) microscopy as a hot electron thermometer, we show that disorder-assisted acoustic-phonon supercollisions (SCs) best describe the rate-limiting relaxation step in graphene over a wide range of lattice temperatures (Tl = 5-300 K), Fermi energies (E(F) = ± 0.35 eV), and optical probe energies (~0.3-1.1 eV). Comparison with simultaneously collected transient photocur...

The quantum transport of a gated polythiophene nanodevice is analyzed using density functional theory and nonequilibrium Green's function approach. For this typical molecular field effect transistor, we prove the existence of two main features of electronic components, i.e., negative differential resistance and good switching. Ab initio based explanations of these features are provided by disti...

The growth of graphene on Ni using a photo-thermal chemical vapour deposition (PT-CVD) technique is reported. The non-thermal equilibrium nature of the PT-CVD process resulted in a much shorter duration of the overall growth time for graphene in both the heating up and cooling down stages, thus allowing for the reduction. Despite the reduced time for synthesis compared to standard thermal chemi...

In utilizing nanodevice development research papers to assist in experimental planning and design, it is useful to identify and annotate characteristic categories of information contained in those papers such as source material, evaluation parameter, etc. In order to support this annotation process, we have been working to construct a nanodevice development corpus and a complementary automatic ...

We present an idea for a nanodevice in which an arbitrary sequence of three basic quantum single qubit gates-negation, Hadamard, and phase shift-can be performed on a single electron spin. The spin state is manipulated using the Dresselhaus spin-orbit coupling intrinsically present in zinc blende materials. The electron trajectory within the device is controlled by voltages applied to a multipl...

A Redfield-like Liouville equation for an open system that couples to one or more leads and exchanges particles with them is derived. The equation is presented for a general case. A case study of time-dependent transport through a single quantum level for varying electrostatic and chemical potentials in the leads is presented. For the case of varying electrostatic potentials the proposed equati...