By using the linear combination of bulk band (LCBB) method incorporated with the top of the barrier splitting (TBS) model,we present a comprehensive study on the quantum confinement effects and the source-to-drain tunneling in the ultra-scaled double-gate (DG) metal-oxide-semiconductor field-effect transistors (MOSFETs).A critical body thickness value of 5 nm is found,below which severe valley splittings among different X valleys for the occupied charge density and the current contributions occur in ultra-thin silicon body structures.It is also found that the tunneling current could be nearly 100% with an ultra-scaled channel length.Different from the previous simulation results,it is found that the source-to-drain tunneling could be effectively suppressed in the ultra-thin body thickness (2.0 nm and below) by the quantum confinement and the tunneling could be suppressed down to below 5% when the channel length approaches 16 nm regardless of the body thickness.
We propose a way to measure the strength of quantum nonlocal correlation (QNC) based on the characteristic function, which is defined as a response function under the local quantum measurement in a composite system. It is found that the strength of QNC based on the characteristic function is a half-positive-definite function and does not change under any LU operation. Generally, we give a new definition for quantum entanglement using the strength function. Furthermore, we also give a separability-criterion for 2×m-dimensional mixed real matrix. This paper proposes an alternative way for QNC further research.
GaN PIN betavoltaic nuclear batteries are demonstrated in this work.GaN epitaxial layers were grown on 2-inch sapphire sub-strates by MOCVD,and then the GaN PIN nuclear batteries were fabricated.Current-voltage(I-V)characteristic shows that the small leakage currents are 0.12 nA at 0 V and 1.76 nA at 10 V,respectively.With 147Pm the irradiation source,the maximum open circuit voltage and maximum short circuit current are 1.07 V and 0.554 nA,respectively.The fill factor(FF)of24.7%for the battery was been obtained.The limited performance of the devices is mainly due to the low energy deposition in the microbatteries.Therefore,the GaN nuclear microbatteries are expected to be optimized by growing high quality GaN films,thin dead layer and so on.
