Overview NTT I3 (pronounced "NTT I Cube") is an innovative enterprise with global aspirations that seeks to leverage its Silicon Valley location and core strengths in original cloud and security technologies. We asked newly appointed CEO Srini Koushik to tell us more about NTT I3's core strengths, and as someone who has had a long career in the IT industry, to talk about NTT Group's current standing in the world and NTT I3's outlook for the future.
Abstract Graphene, a two-dimensional sheet of carbon atoms, was experimentally discovered in 2004. Since then, graphene research has progressed exponentially from basic science to applications. NTT aims to make a large impact on the information society through the materials science of graphene and is therefore promoting a wide range of graphene research projects from theory to devices. In this Feature Article, the current status of graphene research underway at NTT laboratories is presented.
Abstract Graphene is a planar honeycomb network composed of carbon atoms. Even though graphene has a very simple structure, it has received considerable attention from researchers in various fields. This article explains the basic principles of Raman spectroscopy for use with graphene in order to provide insight into the unique properties of graphene.
Abstract Hexagonal boron nitride (h-BN), a structural analogue of graphene, is an insulating material with a large band gap. The combination of graphene and h-BN is expected to lead to a wide variety of applications. Thus, the demand for large-area and high-quality growth of h-BN is increasing. This article describes a novel and very simple method for growing a large-area and atomically thin h-BN film. In this method, an amorphous solid source is converted to crystalline h-BN through diffusion of boron and nitrogen atoms in metal foil followed by precipitation at the surface.
Abstract Graphene is a relatively new type of material whose charge carriers exhibit unique relativistic quantum behavior. Recent progress in graphene research has revealed that high-quality and large-scale epitaxial graphene can be obtained through thermal decomposition of SiC. This article describes electrical transport measurements of carrier-density-tunable epitaxial graphene devices that shed new light on graphene. For epitaxial monolayer graphene, we first report on the unusual quantum Hall effect derived from the relativistic nature of the charge carriers and further elucidate its associated physical features. For epitaxial bilayer graphene, we present a signature of a band-gap opening that can be induced by the field effect.
Abstract This article describes time-resolved measurements of plasmon transport in graphene. It is demonstrated that the plasmon velocity can be varied over two orders of magnitude by changing the magnetic field, carrier density, and the gate screening effect.
Abstract Raman scattering spectroscopy is a well-known optical tool for identifying the properties of graphene such as the number of layers, carrier concentration, and strain. Interaction between incident light and a metallic nanoparticle such as gold or silver enhances the intensity of light, which can be used in Raman scattering spectroscopy. This article describes our investigation of graphene properties by using surface-enhanced Raman scattering.
Abstract This article describes our recent research on a selective protein detection system built on a graphene oxide (GO) surface. Our original idea is to fix pieces of GO on a solid support. This enables direct observation of chemical reactions occurring on the GO surface and on-chip device fabrication. The basic principle can be applied to other proteins as well as other biological molecules simply by changing the molecules to be modified, which makes GO a versatile platform for integrated biosensing devices.
Abstract Quantum entanglement is an essential resource for quantum information processing technologies, including quantum communication and quantum computation. In this article, we present the world's first-ever monolithically integrated polarization-entangled photon pair source on a silicon chip.
Abstract The International Telecommunication Union (ITU) workshop on eHealth and the fourth meeting of the ITU-T (ITU-Telecommunication Standardization Sector) Focus Group on Disaster Relief Systems, Network Resilience and Recovery (FG-DR&NRR) were held in Shinjuku, Tokyo, February 4¡Ý8, 2013. These ITU events were held together in order to promote mutual understanding between working areas in healthcare and disaster response, and to increase NTT's presence in both fields. This article describes the main results of these events.
Practical Field Information about Telecommunication Technologies
Abstract In this article, we introduce failure cases in access facilities (aerial metallic communication facilities) and countermeasures to them. This is the eighteenth in a bimonthly series on the theme of practical field information on telecommunication technologies. This month's contribution is from the Access Engineering Group, Technical Assistance and Support Center, Maintenance and Service Operations Department, Network Business Headquarters, NTT EAST.