Solid State Physics Laboratory

About: Solid State Physics Laboratory is a facility organization based out in Delhi, India. It is known for research contribution in the topics: Quantum dot & Dielectric. The organization has 1754 authors who have published 2597 publications receiving 50601 citations.

Nonlinear optics in the fractional quantum Hall regime

Abstract: Engineering strong interactions between optical photons is a great challenge for quantum science. Envisioned applications range from the realization of photonic gates for quantum information processing to synthesis of photonic quantum materials for investigation of strongly-correlated driven-dissipative systems. Polaritonics, based on the strong coupling of photons to atomic or electronic excitations in an optical resonator, has emerged as a promising approach to implement those tasks. Recent experiments demonstrated the onset of quantum correlations in the exciton-polariton system, showing that strong polariton blockade could be achieved if interactions were an order of magnitude stronger. Here, we report time resolved four-wave mixing experiments on a two-dimensional electron system embedded in an optical cavity, demonstrating that polariton-polariton interactions are strongly enhanced when the electrons are initially in a fractional quantum Hall state. Our experiments indicate that in addition to strong correlations in the electronic ground state, exciton-electron interactions leading to the formation of polaron polaritons play a key role in enhancing the nonlinear optical response. Besides potential applications in realization of strongly interacting photonic systems, our findings suggest that nonlinear optical measurements could provide information about fractional quantum Hall states that is not accessible in linear optical response.

Absence of a boron isotope effect in the magnetic penetration depth of MgB 2

Abstract: The magnetic penetration depth $\ensuremath{\lambda}(0)$ in polycrystalline ${\mathrm{MgB}}_{2}$ for different boron isotopes $(^{10}\mathrm{B}∕^{11}\mathrm{B})$ was investigated by transverse field muon spin rotation. No boron isotope effect on the penetration depth $\ensuremath{\lambda}(0)$ was found within experimental error: $\ensuremath{\Delta}\ensuremath{\lambda}(0)∕\ensuremath{\lambda}(0)=0.8(8)%$, suggesting that ${\mathrm{MgB}}_{2}$ is an adiabaic superconductor. This is in contrast to the substantial oxygen isotope effect on $\ensuremath{\lambda}(0)$ observed in cuprate high-temperature superconductors.