Long baseline neutrino experiments and leptonic CP violation
Abstract
The study of CP violation addresses fundamental questions such as – are the laws of physics the same for matter and anti-matter. CP is a discrete symmetry of nature given by a product of two quantities : charge conjugation (C) and parity (P). Detecting leptonic CP violation is one of the most challenging goals in particle physics today. An attractive possibility to measure CP phase is via long baseline accelerator experiments such as Deep Underground Neutrino Experiment (DUNE). In this talk, we will show that clean extraction of CP violating phase becomes a formidable task in presence of new physics. We discuss one possible experimental strategy to distinguish between standard paradigm and the new physics scenarios.
Effect of electron-hole asymmetry on optical conductivity in 8-Pmmn borophene
Abstract
8-Pmmn borophene is a polymorph of borophene that exhibits anisotropic tilted Dirac cones. In our work, we have done a detailed theoretical study of the optical conductivity of 8-Pmmn borophene. We provide exact analytical expressions of the maximum optical conductivity. We also obtain exact analytical expressions of the minimum energy (1) required to trigger the inter-band optical transitions and energy (2) needed to attain maximum optical conductivity. We find that the optical conductivity are highly anisotropic as a consequence of the anisotropic Dirac cone. The optical conductivities have a non-monotonic behavior with photon energy in the regime between 1 and 2, as a result of the tilted parameter . The tilted parameter can be extracted by knowing 1 and 2 from optical measurements.
The maximum values of the components of the optical conductivity do notdepend on the carrier density and the tilted parameter. The product of the maximum values of the anisotropic conductivities has the universal value (e2=4h2 ). The tilted anisotropic Dirac cones in 8-Pmmn borophene can be realized by the optical conductivity measurement.
Reference: S.Verma, A. Mawrie and T. K. Ghosh, Physical Review B 96, 155418 (2017).
13/11/2017 at 4:00 pm
Professor Sreerup Raychaudhuri, TIFR, Mumbai
Colloquium
IOP Lecture Hall
Document Date:
The early history of particle physics research in India
