arXiv subjects

Babu Ram

Publications and source records attributed to Babu Ram.

3 recordsLinked to original sources

arXiv2025

BO-graphane and BO-diamane

The adsorption of boron and oxygen atoms onto mono- and multi-layer graphene leads to the formation of a buckled graphene layer (BO-graphane) and a 2D diamond-like structure (BO-diamane) sandwiched between boron monoxide layers per DFT calculations. BO-graphane has a calculated Young's modulus ($\it{E}$) of 750 GPA and BO-diamane 771 GPa, higher than the calculated $\it{E}$ of -F,-OH, and -H diamanes; this is due to the presence of B-O bonds in the functionalizing layers. Electronic band structure calculations show BO-graphane and BO-diamane are wide band gap semiconductors with an indirect band gap up to a thickness of three layers (3L). Phonon dispersion and $ab-initio$ molecular dynamics (AIMD) simulations confirm dynamic and thermal stability, maintaining structural integrity at 1000 K. The room-temperature lattice thermal conductivity of BO-graphane and BO-diamane is found to be 879 W/m.K and 1260 W/m.K, respectively, surpassing BeO (385 W/m.K), MgO (64 W/m.K), and Al$_2$O$_3$ (36 W/m.K); and F-diamane (377 W/m.K), and comparable to H-diamane (1145-1960 W/m.K), suggesting them as candidates for thermal management in applications.

cond-mat.mtrl-sci↗

arXiv2015

From semiconductor to metal: A reversible tuning of electronic properties of mono to multilayered SnS$_\mathrm{2}$ under applied strain

Controlled variation of the electronic properties of 2D materials by applying strain has emerged as a promising way to design materials for customized applications. Using first principles density functional theory calculations, we show that while the electronic structure and indirect band gap of SnS$_\mathrm{2}$ do not change significantly with the number of layers, they can be reversibly tuned by applying biaxial tensile (BT), biaxial compressive (BC), and normal compressive (NC) strains. Mono to multilayered SnS$_\mathrm{2}$ exhibit a reversible semiconductor to metal transition (S-M) at strain values of 0.17, $-$0.26, and $-$0.24 under BT, BC, and NC strains, respectively. Due to weaker interlayer coupling, the critical strain value required to achieve S-M transition in SnS$_\text{2}$ under NC strain is much higher than for MoS$_\mathrm{2}$. The S-M transition for BT, BC, and NC strains is caused by the interaction between the S-$p_z$ and Sn-$s$, S-$p_x$/$p_y$ and Sn-$s$, and S-$p_z$ and Sn-$s$ orbitals, respectively.

cond-mat.mtrl-sci↗

arXiv2004

L^1-convergence of complex double Fourier series

It is proved that the complex double Fourier series of an integrable function $f(x,y)$ with coefficients $\{c_{jk}\}$ satisfying certain conditions, will converge in $L^{1}$-norm. The conditions used here are the combinations of Tauberian condition of Hardy--Karamata kind and its limiting case. This paper extends the result of Bray [1] to complex double Fourier series.

math.FA↗