We measure the temperature distribution in a biased single-layer graphene transistor using Raman scattering microscopy of the 2D-phonon band. Peak operating temperatures of 1050 K are reached in the middle of the graphene sheet at 210 kW cm(-2) of dissipated electric power. The metallic contacts act as heat sinks, but not in a dominant fashion. To explain the observed temperature profile and he...

The one-dimensional Hubbard model with different on-site interactions is investigated by renormalization group technique. In the case of a 1/4filled band the dynamical nonequivalence of sites leads to the appearance of Umklapp processes in the system and to the dynamical generation of a gap in the charge excitation spectrum for Ua 6= Ub, Ua > 0 or Ub > 0. The groundstate phase diagram is obtain...

The effect of a helicoidal magnetic field on the dispersion conduction electrons in one- and two-dimensional systems is investigated. In periodic field, there special symmetry with respect to reversal time, which leads peculiarities band structure. Using an example one-dimensional model system, topological properties structure effective corresponding 120 o -ordering are PdCrO 2 , ordering diele...

The out-of-plane thermal conductivity and elastic constant of epitaxial [100] $^{12}\mathrm{C}/^{13}\mathrm{C}$ superlattice diamonds with layer thicknesses 1, 30, 100 nm are evaluated by picosecond ultrasound spectroscopy. measured constants the superlattices equivalent to those single-layer diamond thin films. This result confirms our success in synthesizing specimens few defects at interface...

The atomic structure and electronic properties of monolayer graphene on a curved multi-nano-vicinal Pt (1 1 1) substrate are investigated with low-energy electron diffraction, scanning tunneling microscopy angle-resolved photoemission spectroscopy. Despite grows continuously over the terraces step bunching areas, spatial periodicity also varies by varying vicinal angle substrate. This superperi...

We revisit a phenomenological model of fermions coupled to fluctuating bosons that emerges from finite-momentum particle-particle pairs for describing the strange metal phase in cuprates. The incoherent dominate transport properties resistivity and optical conductivity non-Fermi liquid phase. Within Kubo formalism, is approximately linear temperature with Drude form conductivity, such lifetime ...

The combination of aberration correction and ultra high energy resolution with monochromators has made it possible to record images showing lattice in phonon modes, both a displaced collection aperture more recently an on –axis aperture. In practice the objective include Bragg reflections that correspond observed image spacings, specimen be sufficiently thick for adequate scattered intensity. T...