The final chapters touch on , introducing quantum dots, quantum wells, and the concept of surface-to-volume ratio. Pillai explains how the density of states changes from continuous in 3D to staircase-like in 2D (quantum wells) to discrete in 0D (quantum dots). This section, though brief, serves as a springboard for students entering the rapidly growing field of nanotechnology.
If you are preparing for GATE Physics or JAM, Pillai’s solved problems are gold. If you need the quantum mechanical foundations, supplement with Kittel Chapter 6-9. Solid State Physics So Pillai.pdf