Magnetically Stabilized Luminescent Excitations in Hexagonal Boron Nitride
نویسندگان
چکیده
Magnetically stabilized luminescence is observed in hexagonal boron nitride. The luminescence is induced by absorption of cold neutrons and is in the visible region. In the absence of a magnetic field, the photon emission level is observed to decay over several hundred seconds. A fraction of this luminescence can be suppressed if the temperature is T . 0.6 K and the magnetic field is B & 1.0 T. Subsequent to irradiation and suppression, luminescence can be induced by an increase in T or lowering of B. Possible explanations include stabilization of triplet states or the localization and stabilization of excitons.
منابع مشابه
Dielectric strength, optical absorption, and deep ultraviolet detectors of hexagonal boron nitride epilayers
Related Articles Effective passivation of In0.2Ga0.8As by HfO2 surpassing Al2O3 via in-situ atomic layer deposition Appl. Phys. Lett. 101, 172104 (2012) Atomic structure and energy spectrum of Ga(As,P)/GaP heterostructures J. Appl. Phys. 112, 083713 (2012) Capacitance-voltage profiling on polar III-nitride heterostructures J. Appl. Phys. 112, 083704 (2012) Structural-dependent thermal conductiv...
متن کاملExcitons in hexagonal nanonetwork materials
Optical excitations in hexagonal nanonetwork materials, for example, Boron-Nitride (BN) sheets and nanotubes, are investigated theoretically. A permanent electric dipole moment, whose direction is from the B site to the N site, is considered along the BN bond. When the exciton hopping integral is restricted to the nearest neighbors, the flat band of the exciton appears at the lowest energy. The...
متن کاملExperimental comparison of thermal neutron absorption cross section in nano and micro particles
The neutron collision cross-section is important in neutron use for a specific job, such as neutron therapy or even in nuclear reactors. In calculating computational codes such as MCNP, only information from the neutron-to-mass collision information contained in the computational code library is used, in the case of nanoscale particles in contrast to the mass of materials and / or particulate m...
متن کاملCO oxidation catalyzed by the single Co atom embedded hexagonal boron nitride nanosheet: a DFT-D study.
A single metal atom stabilized on two dimensional materials (such as graphene and h-BN) exhibits extraordinary activity in the oxidation of CO. The oxidation of CO by molecular O2 on a single cobalt atom embedded in a hexagonal boron nitride monolayer (h-BN) is investigated using first-principles calculations with dispersion-correction. It is found that the single Co atom prefers to reside in a...
متن کاملIs hexagonal boron nitride always good as a substrate for carbon nanotube-based devices?
Hexagonal boron nitride sheets have been noted especially for their enhanced properties as substrates for sp(2) carbon-based nanodevices. To evaluate whether such enhanced properties would be retained under various realistic conditions, we investigate the structural and electronic properties of semiconducting carbon nanotubes on perfect and defective hexagonal boron nitride sheets under an exte...
متن کامل