Metastable arsenic-antisite{gallium-antisite pair in GaAs has been studied using self-consistent, parameter-free total energy methods. The metastability of this defect is similar to that of the isolated arsenic-antisite. The anti-structure pair has ionization levels in the band gap in the metastable connguration, unlike the isolated arsenic-antisite. These ionization levels enable absorption of...

We report on the observation of two types of current driven transitions in metastable vortex lattices. The metastable states, which are missed in usual slow transport measurements, are detected with a fast transport technique in the vortex lattice of undoped 2H-NbSe2. The transitions are seen by following the evolution of these states when driven by a current. At low currents we observe an equi...

We argue that trie systematic deviation from perfect aging (which means that trie relaxation function only depend on the ratio £, where tw is trie waiting time) observed in spin-glasses can be accounted for if trie numberlf available metastable states is finite. A significant fraction of these metastable states will be visited after an "ergodic" time which we estimate from trie experiments to b...

In this paper, a brief summary of different methods of fabrication of optical preform and fiber is reviewed. Several methods of incorporation of erbium ions into optical preforms are studied. Characterization of the fabricated erbium doped fibers including measurements of refractive index profile, absorption, fluorescence and gain spectra and metastable lifetime are described. It is also expres...

The thermal conductivity of minerals is a fundamental parameter in understanding the evolution and dynamics Earth. Wadsleyite, major mineral mantle transition zone (MTZ), can contain abundant water. However, how water affects its remains unknown. Here, we predicted dry hydrous wadsleyite at high pressure temperature (P-T) by combining non-equilibrium molecular machine learning potential trained...