Proximity-Induced Colossal Conductivity Modulation in Phosphorene

Abstract

Phosphorene is a promising single elemental two-dimensional layered semiconductor with huge potential for future nanoelectronics and spintronics applications. In this work, we investigated the effect of an organic molecule (benzene) in the close proximity of a Phosphorene nanoribbon. Our extensive calculations reveal that the semiconducting nature of Phosphorene stays unaffected as a result of the molecular adsorption while the transport properties go through drastic changes. Under the influence of dopant atoms and external strain, colossal changes in the conductivity is observed with a maximum enhancement > 1500% which has not been observed earlier. This effect is pretty robust against the (i) variation of system size, (ii) type, location and concentration of dopants and (iii) nature and magnitude of the external strain. Furthermore, we demonstrated how a gate voltage can be used to fine tune the enhanced conductivity response in a Field-effect transistor (FET) structure. Our results provide new direction for Phosphorene based nanoelectronics in applications like sensing, switching where a higher level of conduction can offer better resolution, higher ON/OFF ratio and superior energy efficiency.

Electronic phase-crossover and room temperature ferromagnetism in a two-dimensional (2D) spin lattice

“…2d. The formation energy (E form ) was calculated using eqn (1) as, E form ¼ (mE Cr + nE Ge + pE Te À E Cr 2 Ge 2 Te 6 )/(m + n + p) (1) where E Cr , E Ge and E Te are the total energies of chromium, germanium and tellurium atoms respectively. E Cr 2 Ge 2 Te 6 is the total energy of a CGT unit cell having m ¼ n ¼ 2 and p ¼ 6.…”

“…The emergence of two-dimensional (2D) materials has paved the way for the development of several nanoelectronic and spintronic devices. 1 Extensive studies were conducted to explore the electronic properties of these materials which is tunable through the presence of doping, 2,3 strain, 4–6 vacancy 7–9 and electric field 5,10,11 etc. In addition, van der Waals heterostructure of these 2D materials can be employed to generate engineered properties for desired applications.…”

Spin-selective response tunability in two-dimensional nanomagnet

“…The spin polarisation is estimated for different strain cases, which signi es the ef ciency of a spintronic system. It is calculated using equation (8) given by,…”

“…The combination of such materials can be used to generate van der Waal's heterostructures with engineered properties relevant for desired applications [3,4]. Since the discovery of graphene [5], a large number of two-dimensional (2D) materials have been explored with diverse electronic properties which are mostly non-magnetic [6][7][8][9] in nature. The presence of an intrinsic magnetic ordering in these materials can be immensely useful for the development of 2D spintronics and integrated 2D circuits for superior performance.…”

Electron Optics in Phosphorene pn Junctions: Negative Reflection and Anti-Super-Klein Tunneling

“…Also phosphorene nanoribbons have been produced . The electronic structure of this material shows (in contrast to graphene) an intrinsic band gap and strong anisotropy, which causes the electrons to behave in one direction like massive Dirac Fermions and in the orthogonal direction like nonrelativistic Schrödinger electrons. − This unique electronic structure makes phosphorene very attractive for both fundamental research and technological applications such as transistors − and sensors …”