6,017 research outputs found
Electrically Tunable Energy Bandgap in Dual-Gated Ultra-Thin Black Phosphorus Field Effect Transistors
The energy bandgap is an intrinsic character of semiconductors, which largely
determines their properties. The ability to continuously and reversibly tune
the bandgap of a single device during real time operation is of great
importance not only to device physics but also to technological applications.
Here we demonstrate a widely tunable bandgap of few-layer black phosphorus (BP)
by the application of vertical electric field in dual-gated BP field-effect
transistors. A total bandgap reduction of 124 meV is observed when the
electrical displacement field is increased from 0.10V/nm to 0.83V/nm. Our
results suggest appealing potential for few-layer BP as a tunable bandgap
material in infrared optoelectronics, thermoelectric power generation and
thermal imaging.Comment: 5 pages, 4 figure
Search for the signal of monotop production at the early LHC
We investigate the potential of the early LHC to discover the signal of
monotops, which can be decay products of some resonances in models such as
R-parity violating SUSY or SU(5), etc. We show how to constrain the parameter
space of the models by the present data of boson hadronic decay branching
ratio, mixing and dijet productions at the LHC. Then, we study
the various cuts imposed on the events, reconstructed from the hadronic final
states, to suppress backgrounds and increase the significance in detail. And we
find that in the hadronic mode the information from the missing transverse
energy and reconstructed resonance mass distributions can be used to specify
the masses of the resonance and the missing particle. Finally, we study the
sensitivities to the parameters at the LHC with =7 TeV and an
integrated luminosity of in detail. Our results show that the
early LHC may detect this signal at 5 level for some regions of the
parameter space allowed by the current data.Comment: 25 pages, 18 figures, 3 tables, version published in Phys.Rev.
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