112 citations · 332 across the 15 of their papers we have counts for
8 papers · 1 filter
Strain tuning the magnetic and transport properties of MnGe
Sayak Dasgupta
The kagome lattice antiferromagnet MnGe has a local hexagonal symmetry with a 120 ordered ground state. This non-colinear ground state engenders a strong anomalous Hall…
Tuning the Hall response of a noncollinear antiferromagnet via spin-transfer torques and oscillating magnetic fields
Sayak Dasgupta, Oleg A. Tretiakov
The kagome lattice antiferromagnets MnX(= Sn, Ge) have a noncollinear 120 ordered ground state, which engenders a strong anomalous Hall response. It has been shown that…
Zeeman term for the Néel vector in a two sublattice antiferromagnet using Dzyaloshinsky-Moriya interaction and magnetic field
Sayak Dasgupta, Ji Zou
We theoretically investigate the dynamics of solitons in two sublattice antiferromagnets under external perturbations, focusing on the effect of Dzyaloshinsky-Moriya (DM) interacti…
Ambipolar magneto-optical response of ultra-low carrier density topological insulators
Dipanjan Chaudhuri, Maryam Salehi, Sayak Dasgupta +5
We have investigated the THz range magneto-optical response of ultralow carrier density films of SbTe using time-domain THz polarimetry. Undoped SbTe has a chemical…
Theory of spin waves in a hexagonal antiferromagnet
Sayak Dasgupta, Oleg Tchernyshyov
We construct a field-theoretic description of spin waves in hexagonal antiferromagnets with three magnetic sublattices and coplanar magnetic order. The three Goldstone…
Quantum statistics of vortices from a dual theory of the XY ferromagnet
Sayak Dasgupta, Shu Zhang, Ibrahima Bah +1
We extend the well-known mapping between the easy-plane ferromagnet and electrostatics in spatial dimensions to dynamical and quantum phenomena in a spacetime. Ferrom…
Energy-momentum tensor of a ferromagnet
Sayak Dasgupta, Oleg Tchernyshyov
The energy-momentum tensor of a ferromagnet derived according to the standard prescription of Noether's theorem has a major flaw: the term originating from the spin Berry phase is…
Gauge fields and related forces in antiferromagnetic solitons
Sayak Dasgupta, Se Kwon Kim, Oleg Tchernyshyov
We derive equations of motion for topological solitons in antiferromagnets under the combined action of perturbations such as an external magnetic field and torque-generating elect…