70 citations · 139 across the 9 of their papers we have counts for
10 papers · 1 filter
Terahertz anomalous Hall effect in magnetic Weyl semimetal CoSnS
Ashutosh Singh, Hongjing Xu, Xielin Wang +6
Time-reversal-symmetry-broken Weyl semimetals are known to have at least two nodes in their electronic band structure, separated in momentum space and acting as sources and sinks o…
Hyperbolic polaritons in topological nodal ring semimetals
Ashutosh Singh, Maria Sebastian, Yuanping Chen +2
In mirror-symmetric systems, there is a possibility of the realization of extended gapless electronic states characterized as nodal lines or rings. Strain induced modifications to…
Giant optical activity and Kerr effect in type-I and type-II Weyl semimetals
Kabyashree Sonowal, Ashutosh Singh, Amit Agarwal
We explore optical activity in thin films and bulk of type-I and type II Weyl semimetals (WSM), and demonstrate the existence of a giant Kerr effect in both. In time-reversal symme…
Effect of chiral anomaly on the circular dichroism and Hall angle in doped and tilted Weyl semimetals
Ashutosh Singh, J. P. Carbotte
From the Kubo formula for transport in a tilted Weyl semimetal we calculate the absorptive part of the dynamic conductivity for both right and left handed circular polarized light.…
Terahertz modulated optical sideband generation in graphene
Ashutosh Singh, Saikat Ghosh, Amit Agarwal
Exploration of optical non-linear response of graphene predominantly relies on ultra-short time domain measurements. Here we propose an alternate technique that uses frequency modu…
Nonlinear and anisotropic polarization rotation in two dimensional Dirac materials
Ashutosh Singh, Saikat Ghosh, Amit Agarwal
We predict nonlinear optical polarization rotation in two dimensional massless Dirac systems including graphene and 8- borophene. When illuminated, a continuous wave optical…
Nonlinear, anisotropic and giant photoconductivity in intrinsic and doped graphene
Ashutosh Singh, Saikat Ghosh, Amit Agarwal
We present a framework to calculate the anisotropic and non-linear photoconductivity for two band systems with application to graphene. In contrast to the usual perturbative (secon…
Nonlinear optical conductivity of a generic two band systems, with application to doped and gapped graphene
Ashutosh Singh, Tuhina Satpati, Kirill I. Bolotin +2
We present a general formulation to calculate the dynamic optical conductivity, beyond the linear response regime, of any electronic system whose quasiparticle dispersion is descri…
Wave packet dynamics in various two-dimensional systems: a unified description
Ashutosh Singh, Tutul Biswas, Tarun Kanti Ghosh +1
In this article we present an exact and unified description of wave-packet dynamics in various 2D systems in presence of a transverse magnetic field. We consider an initial minimum…
Wave packet dynamics in monolayer MoS with and without a magnetic field
Ashutosh Singh, Tutul Biswas, Tarun Kanti Ghosh +1
We study the dynamics of electrons in monolayer Molybdenum Disulfide (MoS), in the absence as well as presence of a transverse magnetic field. Considering the initial electroni…