Browsing by Subject "2D"

Now showing 1 - 3 of 3

Open Access
Advances in fiber sensing devices decorated with functionalized nanomaterials
(2023-05-08) Yıldırım, Elif Yapar; Karatutlu, Ali
Hybrid sensor devices formed via decoration of nanomaterials on the surface of optical fibers are designed and fabricated for sensing specific physical, chemical, or biological objects. In this chapter, advances in optical fiber sensing devices functionalized with nanomaterials are outlined with respect to optical fiber types including the optical fiber sensing device preparation processes, detection object, sensitivity, and their sensing mechanism. The single- and multimode fibers, active fibers, fiber Bragg gratings, and photonic crystal fibers are the mostly utilized forms of optical fiber sensing devices. The emerging functionalized nanomaterials reviewed here are limited to quantum dots, plasmonic nanoparticles (NPs), 2D nanomaterials, and rare earth–doped NPs.
Open Access
Mutual dipolar drag in a bilayer Fermi gas
(American Physical Society, 2024-07-12) Renklioğlu, Başak; Hu, Ben Yu-Kuang; Oktel, Mehmet; Tanatar, Bilal
We consider two-dimensional spin-polarized dipolar Fermi gases confined in a double-layer system and calculate the momentum transfer between the layers as a function of temperature to investigate the transport properties of the system. We use the Hubbard approximation to describe the correlation effects and the screening between the dipoles within a single layer. The effective interlayer interaction between the dipoles across the layers is obtained by the random-phase approximation. We calculate the interaction strength and the layer separation distance dependence of the drag rate, and we show that there is a critical distance below which the system is unstable. In addition, we calculate the typical behavior of the collective modes related to the density fluctuations.
Open Access
Realization of a p-n junction in a single layer boron-phosphide
(Royal Society of Chemistry, 2015) Çakır, D.; Kecik, D.; Sahin, H.; Durgun, Engin; Peeters, F. M.
Two-dimensional (2D) materials have attracted growing interest due to their potential use in the next generation of nanoelectronic and optoelectronic applications. On the basis of first-principles calculations based on density functional theory, we first investigate the electronic and mechanical properties of single layer boron phosphide (h-BP). Our calculations show that h-BP is a mechanically stable 2D material with a direct band gap of 0.9 eV at the K-point, promising for both electronic and optoelectronic applications. We next investigate the electron transport properties of a p-n junction constructed from single layer boron phosphide (h-BP) using the non-equilibrium Green's function formalism. The n- and p-type doping of BP are achieved by substitutional doping of B with C and P with Si, respectively. C(Si) substitutional doping creates donor (acceptor) states close to the conduction (valence) band edge of BP, which are essential to construct an efficient p-n junction. By modifying the structure and doping concentration, it is possible to tune the electronic and transport properties of the p-n junction which exhibits not only diode characteristics with a large current rectification but also negative differential resistance (NDR). The degree of NDR can be easily tuned via device engineering.