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As an application of cryo-CMOS technology for use in future quantum computing, we have explored low-frequency noise reduction in a two-dimensional (2D) system consisting of a molybdenum disulfide (MoS2) channel sandwiched by hexagonal boron nitride (hBN) layers. Due to the passivation effect of hBN layers, low-frequency noise in hBN/MoS2/hBN channel devices exhibited substantial reduction compared to the case of MoS2 channel directly on a silicon dioxide substrate and also silicon devices, suggesting that the clean interface of substrate and gate dielectric layers, as well as the protected surface of the MoS2 channel by hBN passivation from the damage by the fabrication process, contribute to the strong reduction in low-frequency noise. The results indicated that 2D materials are suitable for cryo-CMOS technology in terms of low-frequency noise since they will bring about mitigation of one of the most serious causes of quantum phase decoherence of qubits in future large-scale integrated quantum computers. [ABSTRACT FROM AUTHOR]

A practical wide bandgap was induced in bilayer graphene using a perpendicular electric field. A self-assembled gate insulator was used to apply a large electric field. The wide bandgap allows the operation of fundamental logic gates composed of bilayer graphene transistors. The results reviewed here indicate the potential for graphene electronics to be realized as emerging transistors with an atomically thin semiconductor. [ABSTRACT FROM AUTHOR]

The vortex state under a magnetic field applied nearly parallel to the superconducting plane has been studied by means of an ac susceptibility measurement around 2 MHz in the organic superconductors κ-(ET)2Cu[N(CN)2]Br and κ-(ET)2Cu(NCS)2. The diamagnetic response, due to pinning of the staircase vortices for the inclined field, was suppressed by the increase in the magnetic field. This finding indicates that the parallel vortices become freely movable as a result of either decoupling between layers or depinning of Abrikosov vortices in the layer plane. We found that the suppression of the diamagnetic response was promoted by the parallel field component. [ABSTRACT FROM AUTHOR]