This book provides a comprehensive overview of recent advances in the study of semimetals that host symmetry‑protected nodal points and nodal lines in their Brillouin zones. It introduces analytical techniques for calculating transport properties—such as electrical conductivity—when these materials are exposed to external perturbations including electromagnetic fields and temperature gradients. The focus is on regimes where the formation of Landau levels due to an applied magnetic field can be neglected, allowing the use of the semiclassical Boltzmann formalism. The central theme is how the topological properties of electronic band structures give rise to distinctive, topology‑driven transport responses. These materials offer a rich setting in which abstract mathematical concepts from topology manifest as measurable physical phenomena. A basic knowledge of quantum mechanics and linear‑response theory is assumed. This volume is well suited for advanced students, as well as researchers—both theorists and experimentalists—in condensed matter physics, particularly those interested in understanding transport phenomena in semimetallic phases.

Prof. Dr. Ipsita Mandal is an internationally recognized expert in quantum condensed matter theory. She earned her PhD from the Harish-Chandra Research Institute in 2011 and has held research positions at institutions including UCLA, Perimeter Institute, University of Basel, MPI-PKS, and Cornell University. In 2017, she joined IIT Kharagpur as an Assistant Professor and was appointed Associate Professor at the University of Stavanger in 2019. She moved to the Polish Academy of Sciences in 2020, where she received the Polish Prime Minister's Award for “Outstanding Scientific Achievements” based on her Habilitation Thesis. Since 2023, she has been affiliated with the Shiv Nadar Institute of Eminence (India) and was awarded a Marie Skłodowska-Curie FRIAS COFUND Fellowship at the W3 professorial level. According to Stanford/Elsevier rankings, she was among the top 2% most cited scientists in 2024 and 2025. She has been honored under Springer Nature’s “Her Research, Our Future” campaign for her contributions to research and sustainability. Her accolades include the Nordita Corresponding Fellowship, Ramanujan Fellowship, ICTP Associate Fellowship, Senior Dresden Fellowship, ICTS Faculty Associateship, and the CAS President's International Fellowship. Her research focuses on topological phases and strong correlations in quantum materials, with expertise in analytical techniques applied to solid-state systems.