Research Projects

The proposed research aims to advance our understanding of condensed matter physics by exploring unique quantum phases in two-dimensional systems. The focus is on integrating two distinct systems: single-layer graphene (SLG) and disordered superconducting films (DS). SLG, a single atomic layer of carbon, demonstrates remarkable quantum phenomena such as the quantum Hall effect and quantum Hall ferromagnetism. DS films, on the other hand, undergo a superconductor-insulator quantum phase transition and have been associated with intriguing states like the ‘Bose metal’ and ‘Bose insulator’. This project will utilize advanced nanotechnology techniques for sample preparation, combined with electronic and magneto-transport experiments, low-temperature noise measurements, and cutting-edge theoretical analysis. The hybridization of SLG and DS is anticipated to reveal novel quantum phases. For instance, superconducting fluctuations could induce superconductivity in graphene, altering its band structure and introducing an energy gap. Additionally, interactions mediated by the disordered system might lead to new manifestations of the quantum Hall effect (QHE) and quantum Hall ferromagnetism (QHF). If a gap is introduced into the electronic spectrum, graphene becomes a topological insulator (TI). In this case, one can never get a trivial insulator because the TI surface states are anomalous and to gap them out there must be spontaneous symmetry breaking or topological order. Hence, coupling it to a highly disordered superconductor in the insulating phase which is dominated by vortices may lead to a new exotic topological order. In addition, unexpected superconducting order-parameter symmetry can emerge in graphene as was seen in SLG/High Tc superconductor bi-layers. In this project, we will explore SLG/DS bilayers using different methods of graphene growth, while pushing the disordered systems through the insulator to superconductor transition at variable temperatures, magnetic field and magnetic orientation. This promises to reveal unique and interesting quantum phenomena. Additionally, this proposed project will support national missions such as the ‘India Semiconductor Mission (ISM),’ ‘Make in India,’ and ‘Atmanirbhar Bharat.’ It aims to provide foundational knowledge in semiconductor devices, device manufacturing, and semiconductor characterization etc. Students will also gain hands-on experience through advanced experiments in this project, aligned with industry requirements.