27 citations · 96 across the 11 of their papers we have counts for
11 papers · 1 filter
Quantum oscillation spectroscopy of Fermi-surface topologies in tetralayer graphene
Abhijit Halder, Harsh Varshney, Snehamoyee Hazra +7
Quantum oscillations offer a direct probe of Fermi-surface topology and electronic degeneracy, yet disentangling both simultaneously across the Lifshitz transitions of multiband sy…
Longitudinal Nonreciprocal Charge Transport with Time Reversal Symmetry
Harsh Varshney, Amit Agarwal
Longitudinal nonreciprocal charge transport is usually associated with broken time-reversal symmetry, either from magnetic order or an external magnetic field. Here, we show that i…
Asymmetric Scattering Drives Large Nonlinear Nernst and Seebeck Effects
Harsh Varshney, Amit Agarwal
The nonlinear Nernst and Seebeck effects (NNE and NSE) offer promising routes for thermoelectric energy conversion in non-magnetic systems. While intrinsic mechanisms such as the n…
Spin band geometry drives intrinsic thermal spin magnetization and current
Sankar Sarkar, Harsh Varshney, Sayan Sarkar +1
Generating spin magnetization and spin currents without magnetic or electric fields is a key frontier in spin caloritronics. Spin responses driven by thermal gradients offer a prom…
Detecting Lifshitz Transitions Using Nonlinear Conductivity in Bilayer Graphene
Tanweer Ahmed, Harsh Varshney, Bao Q. Tu +6
The second-order nonlinear electrical response (NLER) is an intrinsic property of inversion symmetry-broken systems which can provide deep insights into the electronic band structu…
Planar Nernst effect from hidden band geometry in layered two-dimensional materials
Rahul Biswas, Harsh Varshney, Amit Agarwal
The Nernst effect is a versatile phenomenon relevant for energy harvesting, magnetic sensing, probing band topology and charge-neutral excitations. The planar Nernst effect (PNE) g…
Intrinsic nonlinear Nernst and Seebeck effect
Harsh Varshney, Amit Agarwal
The Nernst and Seebeck effects are crucial for thermoelectric energy harvesting. However, the linear anomalous Nernst effect requires magnetic materials with intrinsically broken t…
Nonlinear electrical transport unveils Fermi surface malleability in a moiré heterostructure
Suvronil Datta, Saisab Bhowmik, Harsh Varshney +4
Van Hove singularities enhance many-body interactions and induce collective states of matter ranging from superconductivity to magnetism. In magic-angle twisted bilayer graphene, v…
Planar Hall Effect in Quasi-Two-Dimensional Materials
Koushik Ghorai, Sunit Das, Harsh Varshney +1
The planar Hall effect in 3D systems is an effective probe for their Berry curvature, topology, and electronic properties. However, the Berry curvature-induced conventional planar…
Intrinsic nonlinear thermal Hall transport of magnons: A Quantum kinetic theory approach
Harsh Varshney, Rohit Mukherjee, Arijit Kundu +1
We present a systematic study of the nonlinear thermal Hall responses in bosonic systems using the quantum kinetic theory framework. We demonstrate the existence of an intrinsic no…
Quantum kinetic theory of nonlinear thermal current
Harsh Varshney, Kamal Das, Pankaj Bhalla +1
We investigate the second-order nonlinear electronic thermal transport induced by temperature gradient. We develop the quantum kinetic theory framework to describe thermal transpor…