
The Quantum Phases of Matter  Topical (PHY431.5)
Instructor: Prof. Subir Sachdev
ICTS Course no.: PHY431.5
TIFR Course no.: PHY431.1
TIFRH Course no.: PHY431.7
Venue: Online
Class timings: Mondays and Wednesdays from 6:30 PM to 8:00 PM (with Fridays optional for extra classes)
First meeting: Starting September 1. Classes will run till midDecember.
Course description:
1. Introduction to the phases of modern quantum materials
2. Boson Hubbard model: superfluids, insulators, and other conventional phases
3. Electron Hubbard model: antiferromagnets, metals, dwave superconductors, and other conventional phases
4. Mott insulators, resonating valence bonds, and the Z2 spin liquid
5. Gapless spin liquids, and emergent SU(2) and U(1) gauge theories.
6. Kondo impurity in a metal
7. Kondo lattice: the heavy Fermi liquid, and the fractionalized Fermi liquid (FL*). Violations of the Luttinger theorem using emergent gauge fields.
8. The pseudogap metal of the cuprates: FL* theories
9. SYK model of metals without quasiparticles, and emergent gravity
10. Fully connected random models of strong correlation
11. Quantum criticality of Fermi surfaces
Grading policy:
1. Assignments
2. Term paper
3. Presentation of the term paper
The percentages are to be decided soon.
More details: http://qpt.physics.harvard.edu/qpm
For additional information, TIFR students may contact the local tutors on their campus:
ICTS: Subhro Bhattacharjee
TIFR Colaba: Kedar Damle
TIFRH: Kabir Ramola

Advanced Quantum Mechanics (Core)
Course No.: PHY206.5
Instructor: Prof. Subhro Battacharjee
Venue: Online
Class timings: Tuesdays and Thursdays 09:15 AM to 10:45 AM
First meeting: 20th September, 2021
Course description:
 Mathematical preliminaries of quantum mechanics: Linear Algebra; Hilbert spaces (states and operators)
 Heisenberg and Schrodinger pictures
 Symmetries: Role of symmetries and types (spacetime and internal, discrete and continuous); Symmetries and quantum numbers; Simple examples of symmetry (Translation, parity, timereversal); Rotations and representation theory of Angular momentum; Creation and annihilation operator formalism for a simple harmonic oscillator.
 Perturbation Theory
 Scattering
We will also study some additional topics, including some elements of quantum information theory.
Textbook:
Modern Quantum Mechanics by Sakurai.
Course evaluation:
Assignments (typically one every two weeks): 60 %
2 month Term paper + presentation at the end of the semester (topics to be listed after the course starts): 20 %
End sem exam (inclass if situation permits): 20 %

Statistical Mechanics (Core)
Course No.: PHY205.5
Instructor: Prof. Anupam Kundu and Prof. Abhishek Dhar
Venue: Online
Class timings: Wednesdays and Fridays 4:00 PM to 05:30 PM
First meeting: 15th September, 2021
Course description:
 Recap of Fundamentals of thermodynamics, Probability, distributions
 Foundations of equilibrium statistical mechanics — Liouville’s equation, microstate, macrostate, phase space, typicality ideas, (Little on irreversible evolution of macrostate), Kac ring, equal a priori probability, ensembles as tools in statistical mechanics.
 Partition functions, connection to thermodynamical free energies, Response functions
 Examples: Noninteracting systems —— Classical ideal gas, Harmonic oscillator, paramagnetism, adsorption, 2 level systems, molecules, more nonstandard examples.
 Formulation of quantum statistical mechanics —— Quantum microstates, Quantum macrostates, density matrix.
 Quantum statistical mechanical systems —— Dilute polyatomic gases, Vibrations of solid, Black body radiation
 Quantum ideal gases —— Hilbert space of identical particles —— Fermi gas, Pauli paramagnetism —— Bose gas, BEC —— Revisit phonons, photons —— Landau diamagnetism
 Introduction to simulation methods
 Interacting classical gas —— Virial expansions —— Cumulant expansions —— Liquid state physics —— Vander Waals equation
 Introduction to Phase transitions and Critical phenomena, universality, mean field theory, some exactly solvable models.
Textbooks:
 M. Kardar, Statistical Physics of Particles
 R. K. Pathria, Statistical mechanics
 K. Huang, Statistical mechanics
 J. M. Sethna, Statistical Mechanics: Entrop, Order Parameters and Complexity
 M. Kardar, Statistical Physics of ﬁelds
 Landau & Lifshitz, Statistical mechanics
 + some other books and papers, references of which will be provided in the class.
Course evaluation:
50% Assignment + 25% mid sem exam + 25% end sem exam

Introduction to General Relativity (Reading)
Course No.: PHY487.5
Instructor: Bala Iyer
Venue: Online
Class timings: Tuesday 4  5.30 and Friday 2  3.30
First meeting: TBA
Course description:
Reading course based on Ray D'Inverno book Introducing Einstein's Relativity.
Following Chapters:
5. Tensor Algebra
6.Tensor Calculus
7. Integration, Variation, Symmetry
9. Principles of General Relativity
10. Field Eqns of General Relativity
12. Energy Momentum Tensor
14. The Schwarzschild Solution
15. Experimental Tests of GR
16. NonRotating Black Holes
19. Rotating Black Holes
20. Plane Gravitational Waves
21. Radiation from Isolated Source
22. Relativistic Cosmology
23. Cosmological ModelsFormat: Two sessions a week each of 90 minutes with students presenting. Problems on the chapter for tutorials.

Multiphase Flows: Applications to Atmospheric Problems (Reading)
Course No.: PHY499.5
Instructor: Samriddhi Sankar Ray
Venue: Online
Class timings: Saturdays 10 to 12 and Fridays 5 to 7 for one on one tutorials
Class structure: Weekly problemsolving sets/reading assignments followed by classroom discussions/presentations of the same
Course description:
1. Basic thermodynamics: Ideal gas laws, thermodynamics of vapour etc
2. Basic Fluid Mechanics: Equations of motion, instabilities
3. Coupling of scalar fields in multiphase flows
4. Evaporation and condensation
5. Buoyancy
6. Droplet dynamics
7. Collisions and coalescences
8. Smoluchowski equation, kernels and coagulation models
9. Application of ideas to model clouds
Text Books:
1. White, Fluid Mechanics
2. Pope, Turbulent Flows
3. Reif, Fundamentals Of Statistical And Thermal Physics
4. Yau and Rogers, A Short Course in Cloud Physics
5. Pruppacher and Klett, Microphysics of Clouds
These will be supplemented by research and review papers as and when necessary.
Course evaluation: Continuous assessment based on weekly assignments [70%] + End Term Presentation [30%]

Physics at ICTS sessions (Core)
Venue: Online
Class timings: Mondays 11 to 12:30
First meeting: TBA
Outline: These sessions are compulsory for all firstyear physics students (PhD as well as IPhD). Each session will be given by one faculty member about the work done in their groups. Students are supposed to interact and discuss this with the speaker. For each class, 2 students will be assigned to submit a short one page summary of what was discussed.