Tapash Chakraborty Libros

The book explores the burgeoning field of low-dimensional physics that has gained significant attention over the past forty years. It highlights numerous original ideas that have emerged, some of which have been experimentally validated. The narrative also touches on the recognition of this area through multiple Nobel prizes, underscoring its importance and the innovative advancements made in understanding physical phenomena in reduced dimensions.

There have been tremendous theoretical and experimental developments in recent years in the field of the fractional quantum Hall effect. The Fractional Quantum Hall Effect presents a general survey of most of the theoretical work and briefly reviews the experimental results on the excitation gap. Researchers, experimentalists and research students with a background in quantum mechanics and statistical physics should find this book useful.

Charge migration through DNA has been the focus of considerable interest in recent years. A deeper understanding of the nature of charge transfer and transport along the double helix is important in fields as diverse as physics, chemistry and nanotechnology. It has also important implications in biology, in particular in DNA damage and repair. This book presents contributions from an international team of researchers active in this field. It contains a wide range of topics that includes the mathematical background of the quantum processes involved, the role of charge transfer in DNA radiation damage, a new approach to DNA sequencing, DNA photonics, and many others. This book should be of value to researchers in condensed matter physics, chemical physics, physical chemistry, and nanoscale sciences.

The fractional quantum Hall effect (FQHE) was unexpectedly discovered in 1981 by Tsui, Stormer, and Gossard, despite the lack of theoretical predictions for new structures in magnetotransport coefficients under extreme quantum conditions. Over thirty years of research on bulk semiconductors in strong magnetic fields revealed that only the lowest Landau level is occupied, leading to a predicted monotonic resistivity variation with increasing magnetic field, influenced by scattering mechanisms. However, experimental data analysis was complicated by magnetic freeze-out effects and transitions between degenerate and nondegenerate systems. In two-dimensional electron systems, the positive background charge is well-separated, making magnetic freeze-out effects less pronounced and data analysis in the extreme quantum limit easier. Initial measurements on silicon field-effect transistors failed due to significant disorder, which localized all electrons in the lowest Landau level. This led to the development of models like spin glass and Wigner solid, alongside efforts to enhance the quality of semiconductor materials and devices, particularly in two-dimensional electron systems.