62 citations · 321 across the 16 of their papers we have counts for
16 papers
Quantized heat flow in moiré chern bands of bilayer graphene
Santanu Samai, Debangan Sarkar, Abhijit Halder +5
When electrons are subjected simultaneously to a magnetic field and a periodic potential, they form the fractal Hofstadter spectrum, whose topological gaps host quantum Hall and Ch…
Revealing electron-lattice decoupling by Peltier thermometry and nanoscale thermal imaging in graphene
Saurabh Kumar Srivastav, Tobias Völkl, Gary Quaresima +7
Electrical currents in low-dimensional quantum materials can drive electrons far from equilibrium, creating stark imbalance between electron and lattice temperatures. Yet, no exist…
Absence of heat flow in ν = 0 quantum Hall ferromagnet in bilayer graphene
Ravi Kumar, Saurabh Kumar Srivastav, Ujjal Roy +6
The charge neutrality point of bilayer graphene, denoted as ν = 0 state, manifests competing phases marked by spontaneously broken isospin (spin/valley/layer) symmetries under exte…
Quantized heat flow in graphene quantum Hall phases: Probing the topological order
Saurabh Kumar Srivastav, Anindya Das
Topological quantum numbers are often used to characterise the topological order of phase having protected gapless edge modes when the system is kept in a space with the boundary.…
Electric field tunable edge transport in Bernal stacked trilayer graphene
Saurabh Kumar Srivastav, Adithi Udupa, K. Watanabe +3
This letter presents a non-local study on the electric field tunable edge transport in an hBN-encapsulated dual-gated Bernal stacked (ABA) trilayer graphene across various displace…
Electrical noise spectroscopy of magnons in a quantum Hall ferromagnet
Ravi Kumar, Saurabh Kumar Srivastav, Ujjal Roy +7
Collective spin-wave excitations-magnons-in a quantum Hall ferromagnet are promising quasi-particles for next-generation spintronics devices, including platforms for information tr…
Determination of topological edge quantum numbers of fractional quantum Hall phases
Saurabh Kumar Srivastav, Ravi Kumar, Christian Spånslätt +5
To determine the topological quantum numbers of fractional quantum Hall (FQH) states hosting counter-propagating (CP) downstream () and upstream () edge modes, it is pivo…
Observation of ballistic upstream modes at fractional quantum Hall edges of graphene
Ravi Kumar, Saurabh Kumar Srivastav, Christian Spånslätt +5
The structure of edge modes at the boundary of quantum Hall (QH) phases forms the basis for understanding low energy transport properties. In particular, the presence of ``upstream…
Enhanced electron-phonon coupling in doubly aligned hexagonal boron nitride bilayer graphene heterostructure
Manabendra Kuiri, Saurabh Kumar Srivastav, Sujay Ray +4
The relative twist angle in heterostructures of two-dimensional (2D) materials with similar lattice constants result in a dramatic alteration of the electronic properties. Here, we…
Hexagonal Boron Nitride-Graphene Heterostructures with Enhanced Interfacial Thermal Conductance for Thermal Management Applications
Saheb Karak, Suvodeep Paul, Devesh Negi +4
Atomically thin monolayers of graphene show excellent electronic properties which have led to a great deal of research on their use in nanoscale devices. However, heat management o…
Electric-field-tunable valley Zeeman effect in bilayer graphene heterostructures: Realization of the spin-orbit valve effect
Priya Tiwari, Saurabh Kumar Srivastav, Aveek Bid
We report the discovery of electric-field-induced transition from a topologically trivial to a topologically nontrivial band structure in an atomically sharp heterostructure of bil…
Vanishing thermal equilibration for hole-conjugate fractional quantum Hall states in graphene
Saurabh Kumar Srivastav, Ravi Kumar, Christian Spånslätt +5
Transport through edge-channels is responsible for conduction in quantum Hall (QH) phases. Topology dictates quantization of both charge and thermal transport coefficients. These t…
Observation of Time-Reversal Invariant Helical Edge-Modes in Bilayer Graphene/WSe Heterostructure
Priya Tiwari, Saurabh Kumar Srivastav, Sujay Ray +2
Topological insulators, along with Chern insulators and Quantum Hall insulator phases, are considered as paradigms for symmetry protected topological phases of matter. This article…
Universal quantized thermal conductance in graphene
Saurabh Kumar Srivastav, Manas Ranjan Sahu, K. Watanabe +3
The universal quantization of thermal conductance provides information on the topological order of a state beyond electrical conductance. Such measurements have become possible onl…
Equilibration of Quantum hall edges in symmetry broken bilayer graphene
Chandan Kumar, Saurabh Kumar Srivastav, Anindya Das
Equilibration of quantum Hall edges is studied in a high quality dual gated bilayer graphene device in both unipolar and bipolar regime when all the degeneracies of the zero energy…
Localization physics in graphene Moire superlattices
Chandan Kumar, Saurabh Kumar Srivastav, Priyo Adhikary +3
Non-trivial Berry phase of graphene leads to unusual quantum correction to the conductivity. Berry phase of pi in single layer graphene (SLG) and 2pi in bi-layer graphene (BLG) is…