A5068049821- Graphene research and applications
- Quantum and electron transport phenomena
- Topological Materials and Phenomena
- 2D Materials and Applications
- Thermal properties of materials
- Advanced Thermoelectric Materials and Devices
- Molecular Junctions and Nanostructures
- SARS-CoV-2 detection and testing
- Mosquito-borne diseases and control
- Physics of Superconductivity and Magnetism
- Virology and Viral Diseases
- Phase Equilibria and Thermodynamics
- Advanced Thermodynamics and Statistical Mechanics
Swiss Federal Laboratories for Materials Science and Technology
2024
Indian Institute of Science Bangalore
2020-2024
Graphene, a two-dimensional nanomaterial, has gained immense interest in biosensing applications due to its large surface-to-volume ratio, and excellent electrical properties. Herein, compact user-friendly graphene field effect transistor (GraFET) based ultrasensitive biosensor been developed for detecting Japanese Encephalitis Virus (JEV) Avian Influenza (AIV). The novel sensing platform comprised of carboxy functionalized on Si/SiO
Abstract Recent experiments in magic-angle twisted bilayer graphene have revealed a wealth of novel electronic phases as result interaction-driven spin-valley flavour polarisation. In this work, we investigate correlated due to the combined effect spin-orbit coupling-enhanced valley polarisation and large density states below half filling moiré band coupled tungsten diselenide. We observe an anomalous Hall effect, accompanied by series Lifshitz transitions that are highly tunable with...
The introduction of ``twist'' or relative rotation between two atomically thin van der Waals membranes gives rise to periodic moir\'e potential, leading a substantial alteration the band structure planar assembly. While most recent experiments primarily focus on electronic-band hybridization by probing in-plane transport properties, here we report out-of-plane thermoelectric measurements across gap in twisted bilayer graphene, which exhibits an interplay twist-dependent interlayer electronic...
The planar assembly of twisted bilayer graphene (tBLG) hosts multitude interaction-driven phases when the relative rotation is close to magic angle (θm = 1.1∘). This includes correlation-induced ground states that reveal spontaneous symmetry breaking at low temperature, as well possibility non-Fermi liquid (NFL) excitations. However, experimentally, manifestation NFL effects in transport properties remains ambiguous. Here we report simultaneous measurements electrical resistivity (ρ) and...
The electronic bands formed in moir\'e systems with twisted bilayer graphene (tBLG) have emerged as a tunable platform for studying many novel concepts of condensed matter physics due to new interaction and topological effects. In particular, the multitude closely packed flat sequence van Hove singularities (vHSs) minimally tBLG can not only lead nontrivial transport but also breakdown conventional Boltzmann formalism competition between scales energy variation within system that external...
Abstract Twisted van der Waals heterostructures have recently emerged as a versatile platform for engineering interaction-driven, topological phenomena with high degree of control and tunability. Since the initial discovery correlated phases in twisted bilayer graphene, wide range moiré materials fascinating electronic properties. While field twistronics has rapidly evolved now includes multi-layered systems, systems comprised double trilayer graphene remain elusive. Here, we report...
Close to the Dirac point, graphene is expected exist in quantum critical fluid state, where flow of both charge and heat can be described with a dc electrical conductivity $\sigma_\mathrm{Q}$, thermodynamic variables such as entropy enthalpy densities. Although fluid-like viscous frequently reported state-of-the-art devices, value predicted quantized determined only by universality class has not been established experimentally so far. Here we have discerned transport combining ($\sigma$)...
Resolving low-energy features in the density of states (DOS) holds key to understanding a wide variety rich novel phenomena graphene-based 2D heterostructures. The Lifshitz transition bilayer graphene (BLG) arising from trigonal warping has been established theoretically and experimentally. Nevertheless, experimental realization its effects on transport properties challenging because relatively low energy scale (∼1 meV). In this work, we demonstrate that thermoelectric power (TEP) can be...
Quantum Hall (QH) interferometry provides an archetypal platform for the experimental realization of braiding statistics fractional QH states. However, complexity observing requires phase coherence over length interferometer, as well suppression Coulomb charging energy. Here, we demonstrate a new type interferometer based on marginally twisted bilayer graphene (mtBLG), with twist angle θ ≈ 0.16°. With device operating in regime, observe distinct signatures electronic Fabry-Pérot and...
In moiré systems with twisted bilayer graphene (tBLG), the amplification of Coulomb correlation effects at low twist angles ($θ$) is a result nearly flat low-energy electronic bands and divergent density states (DOS) van Hove singularities (vHS). This not only causes superconductivity, Mott insulating states, quantum anomalous Hall effect close to critical (or magic) angle $θ= θ_{c} \approx 1.1^\circ$, but also unconventional metallic that are claimed exhibit non-Fermi liquid (NFL)...
This work is the first experimental demonstration of optoelectronic response in twisted bilayer graphene (tBLG) coupled with WSe 2 . We observe photoresponse tunable Fermi energy, indicative underlying mechanism governed by tBLG band structure.
Reducing the dimensions of magic-angle twisted bilayer graphene devices can amplify disorder potentials caused by doping inhomogeneity, leading to enhanced carrier confinement.
Abstract The planar assembly of twisted bilayer graphene (tBLG) hosts a multitude interaction-driven phases when the relative rotation is close to magic angle (θ = 1.1°). This includes correlation-induced ground states that reveal spontaneous symmetry breaking at low temperature, as well possibility non-Fermi liquid (NFL) excitations. However, experimentally, manifestation NFL effects in transport properties remains ambiguous. Here we report simultaneous measurements electrical resistivity...
New phases of matter can be stabilized by a combination diverging electronic density states, strong interactions, and spin-orbit coupling. Recent experiments in magic-angle twisted bilayer graphene (TBG) have uncovered wealth novel as result interaction-driven spin-valley flavour polarization. In this work, we explore correlated appearing due to the combined effect coupling-enhanced valley polarization large states below half filling ($ν\lesssim 2$) moiré band TBG coupled tungsten...