79 citations · 782 across the 30 of their papers we have counts for
9 papers · 1 filter
Flat Bands in Three-dimensional Lattice Models with Non-trivial Hopf Index
Ivan Dutta, Kush Saha
We report the presence of exactly and nearly flat bands with non-trivial topology in three-dimensional (3D) lattice models. We first show that an exactly flat band can be realized…
Hinge mode dynamics of periodically driven higher-order Weyl semimetals
Somsubhra Ghosh, Kush Saha, K. Sengupta
We study the stroboscopic dynamics of hinge modes of a second-order topological material modeled by a tight-binding free fermion Hamiltonian on a cubic lattice in the intermediate…
Anomalous pumping in the non-Hermitian Rice-Mele model
Abhishek Kumar, Sarbajit Mazumdar, S D Mahanti +1
We study topological charge pumping (TCP) in the Rice-Mele (RM) model with irreciprocal hopping. The non-Hermiticity gives rise to interesting pumping physics, owing to the presenc…
Non-linear transport without spin-orbit coupling or warping in two-dimensional Dirac semimetals
Sai Satyam Samal, S. Nandy, Kush Saha
It has recently been realized that the first-order moment of the Berry curvature, namely the Berry curvature dipole (BCD) can give rise to non-linear current in a wide variety of t…
Probing mirror anomaly and classes of Dirac semimetals with circular dichroism
Abhirup Roy Karmakar, S. Nandy, G. P. Das +1
We theoretically investigate the optical activity of three dimensional Dirac semimetals (DSMs) using circular dichroism (CD). We show that DSMs in the presence of a magnetic field…
Thermopower in an anisotropic two-dimensional Weyl semimetal
Ipsita Mandal, Kush Saha
We investigate the generation of an electric current from a temperature gradient in a two-dimensional Weyl semimetal with anisotropy, in both the presence and absence of a quantizi…
Mirror anomaly and anomalous Hall effect in type-I Dirac semimetals
S. Nandy, Kush Saha, A. Taraphder +1
In addition to the well known chiral anomaly, Dirac semimetals have been argued to exhibit mirror anomaly, close analogue to the parity anomaly of ()-dimensional massive Dirac…
Valley-Selective Landau-Zener Oscillations in Semi-Dirac p-n Junctions
K. Saha, R. Nandkishore, S. A. Parameswaran
We study transport across p-n junctions of gapped two-dimensional semi-Dirac materials: nodal semimetals whose energy bands disperse quadratically and linearly along distinct cryst…
Probing surface states exposed by crystal terminations at arbitrary orientations of three-dimensional topological insulators
Sthitadhi Roy, Kush Saha, Sourin Das
The topological properties of the bulk band structure of a three-dimensional topological insulator (TI) manifest themselves in the form of metallic surface states. In this paper, w…