Science Daily September 26, 2019 Researchers in Japan have developed a highly sensitive rectifying element in the form of a nanowire backward diode, which can covert low-power microwaves into electricity. Equipment they used consists of a radio wave power generating element. The technology can efficiently convert 100nW-class low-power radio waves into electricity, enabling the conversion of microwaves emitted into the environment from mobile phone base stations in an area that is over 10 times greater than was previously possible. The researchers expect that the nanowire backward diode will be applied in using plentiful ambient radio wave energy in 5G communications, […]
Tag Archives: S&T Japan
Scientists develop DNA microcapsules with built-in ion channels
Science Daily September 18, 2019 By utilising DNA nanotechnology, a team of researchers in Japan designed DNA nanoplates as a nanopore device for ion transportation and stabilised the oil–water interface. Microscopic examination revealed the microcapsule formed by the accumulation of amphiphilic DNA nanoplates at the oil–water interface. Ion current measurements revealed the nanoplate pores functioned as channel to transport ions. These findings provide a general strategy for the programmable design of microcapsules to engineer artificial cells and molecular robots. Such systems could be used to develop artificial neural networks…read more. TECHINCAL ARTICLE
Every transistor has a unique quantum fingerprint—but can it be used as a form of ID?
Phys.org July 26, 2019 In nanoelectronics the single-electron effect caused by traps are randomly distributed and not controllable therefore, different current–voltage characteristics are observed through traps even in silicon transistors having the same device parameters. Researchers in Japan analyzed the single-electron effect of traps in conventional silicon transistors. At sufficiently low temperatures at which single-electron effects can be observed (in this case, 1.54 K), they showed that current–voltage characteristics can be used as fingerprints of chips through image recognition algorithms. These results show that single-electron effects can provide a quantum version of a physically unclonable function (PUF). They retain their key […]
Mechanical vibration generated by electron spins
EurekAlert July 2, 2019 Researchers in Japan fabricated a micro cantilever structure made of magnetic insulator yttrium iron garnet (YIG: Y3Fe5O12). A metallic thin wire was put on the root of the cantilever as a heater. When electrical current flows in the wire, the wire works as a generator of spin current by spin Seebeck effect and the spin current propagates into the micro cantilever. By measuring the vibration of the cantilever while injecting the spin current modulated near the resonant frequency of the micro cantilever, they confirmed that only the spin current injection of appropriate spin orientation can excite […]
A new ‘golden’ age for electronics?
Science Daily June 25, 2019 One way that heat damages electronic equipment is by making components expand at different rates, resulting in forces that cause micro-cracking and distortion. The valence fluctuations of Sm in samarium monosulfide (SmS) are known to induce possible large isotropic negative thermal expansion (NTE). Researchers in Japan prepared Ce-doped and Nd-doped SmS polycrystalline samples using a simpler method with much lower reaction temperature than the existing method. Typically, Sm0.80Ce0.20S exhibits giant NTE with total volume change of 2.6% in the wide temperature range from 330 K to 100 K, the lowest covered here. This research opens a new […]
Researchers teleport information within a diamond
EurekAlert June 28, 2019 Researchers in Japan have demonstrated quantum state transfer of photon polarization into a carbon isotope nuclear spin coupled to a nitrogen-vacancy center in diamond based on photon-electron Bell state measurement by photon absorption. The carbon spin is first entangled with the electron spin, which is then permitted to absorb a photon into a spin-orbit correlated eigenstate. Detection of the electron after relaxation into the spin ground state allows post-selected transfer of arbitrary photon polarization into the carbon memory. The study has big implications for quantum information technology…read more. Open Access TECHNICAL ARTICLE
Plumbene, graphene’s latest cousin, realized on the ‘nano water cube’
EurekAlert May 23, 2019 Plumbene is a lead-based 2D honeycomb material that has the largest spin-orbit interaction, due to lead’s orbital electron structure and therefore the largest energy band gap, potentially making it a robust 2D topological insulator in which the Quantum Spin Hall Effect might occur even above room temperature. An international team of researchers (Japan, France) created plumbene by annealing an ultrathin lead (Pb) film on palladium Pd(111). The resulting surface material has the signature honeycomb structure of a 2D monolayer. Beneath the plumbene, a palladium-lead (Pd-Pb) alloy thin film forms with a bubble structure. Atomic‐scale STM images […]
A novel method for improving imaging techniques in geophysical and material studies
Science Daily May 7, 2019 Researchers in Japan have developed a method for identifying the location of point-like scatterers based on fluctuations in the physical properties of the surface. They extracted information on the far-field wave properties of the Green’s function by using the so-called “steepest descent path” and “pseudo-projections” methods. Then, the far-field operator was defined based on the near-field observation and the far-field properties of the Green’s function. They used this far-field operator to obtain the indicator functions that determine the position of the scatterers. They successfully demonstrated the reconstruction of densely packed point-like scatterers using the sensor […]
Study opens a new route to achieving invisibility without using metamaterials
Phys.org April 23, 2019 Researchers in Japan report a way of making a cylinder invisible without a cloak for monochromatic illumination at optical frequency including those visible to the human eye. Based on Mie scattering they looked for a region indicating very low scattering efficiency, which they knew would correspond to the cylinder’s invisibility and determined that in this region invisibility would occur when the refractive index of the cylinder ranges from 2.7 to 3.8. Natural materials such as silicon, aluminum arsenide and germanium arsenide, which are commonly used in semiconductor technology fall in this category. They found that the […]
Ultrafast Cluster Electronics
Next Bi Future April 12, 2019 Researchers in Japan combined quantum chemical and molecular dynamic calculations to predict how clusters of molecules behave and interact over time providing critical insight for future electronics. They used their method to predict the changes in a computer-simulated cluster of benzene molecules over time. When light is applied to the T-shaped benzene clusters, they reorganize themselves into a single stack; an interaction known as pi-stacking. This modification from one shape to another changes the cluster’s electrical conductivity, making it act like an on-off switch. They simulated the addition of a molecule of water to […]