BITS Pilani

  • Page last updated on Tuesday, October 10, 2023

PhD

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PhD@Physics

Programme Details

  • Overview

    The general details of the  department PhD programme follow the institute policies,  details given  in the Academic Research Division website .

    We conduct an admission test usually comprising  a written test and interview. Candidates who have cleared UGC-NET or have an MPhil /MTech degree may directly appear for the interview.

     
    Prospective candidates can align their interests with the research of faculty in the department.
     
    Selected candidates are either supported by a sponsored project or through DST/CSIR fellowships. The BITS also provides a limited number of fellowships to selected candidates. 

    During the first year of PhD, scholars go through course-work, undertake teaching assignments  and participate in department activities. Following this, scholars have to clear a qualifying examination before registering for their PhD thesis.

     
    The PhD candidate is assigned a supervisor and a Doctoral Advisory Committee (DAC), who guide them through the preparation of a research proposal  that is presented to the Department. This is a result of literature survey and  in-depth study of current status of research in their field and formulation of  relevant research questions that they will work on during their PhD. 
     

    Scholars encouraged to collaborate and have frequent discussions. They are expected to present department seminars and present their research progress to the DAC at the end of every semester. Research findings are communicated to the entire research community through papers published in well-regarded journals and through conference presentations.  A set of coherent research outcomes form the PhD thesis which is  evaluated by experts  in the area.

     
    The PhD Thesis defence in the form of a seminar is presented to the Department and examined by an external examiner. Upon the recommendation of the examiners and the supervisor,  the candidate is awarded a PhD degree.
     

  • Admission

    An advertisement for PhD admission normally appears in April & November for admission into 1st semester & 2nd semester respectively. Working professionals (for instance, college teachers) may also seek admission as part-time PhD candidates.  PhD admission test usually comprises  a written test and interview. Candidates who have cleared UGC-NET or have an MPhil /MTech degree may directly appear for the interview.
     
     
    Selected candidates are invited to interact with the department  to choose an area of research and are assigned a supervisor and a Doctoral Advisory Committee (DAC) consisting of at least two faculty members.
     
    The supervisor and DAC select the course package for the first two semesters.
     
     PhD scholars are granted a tuition fee-waiver (decided by  the  current rules of the Institute) in exchange for teaching assistantship. A scholar is assigned teaching work taking up a maximum of 6 hours a week. 

  • Coursework

    During the first two semesters, the scholar goes through formal  coursework decided by the supervisor and DAC based on the scholar's background and requirements. The course unit requirements are a minimum  of 24 units, not exceeding 14 per semester.
     
    The scholar must obtain at least D grade in each course and have a minimum CGPA of 5.5 to be able to continue in the programme. 

    List of Currently available G-level courses

    Laboratory skills are inculcated through the SKILL courses. 
    In addition, the scholar may also be permitted to take specialised  level 4  undergraduate courses as per need.
    If the requirements of a particular candidate are not met by named courses then they may be permitted to take  one of the generic  courses with appropriate content as decided by the DAC.
     
    After successfully qualifying and registering for the PhD  Thesis, the scholar is required to take the Research Methodology course. 
     

  • Qualifying Exam

    A PhD candidate has to qualify in two thrust areas of their choice.
     
    In each area, the candidate must write at least two papers. As of now, the Theoretical Physics  area is compulsory for all candidates in Physics, while they may choose their area of specialisation  as the other thrust area.
     
     Thrust Area Papers 
     Theoretical Physics
    Quantum Physics
    Electromagnetic Theory
    Thermal and Statistical Physics
    Classical mechanics
     
     Astrophysics and Cosmology
    Astronomy and Astrophysics 
    General Relativity and Cosmology 
    Quantum Field Theory 
    Particle Physics
    Nuclear and High Energy Physics Nuclear Physics 
    Advanced Quantum Physics
    Quantum Field Theory 
    General Relativity and Cosmology 
    Particle Physics
     Condensed Matter/Semiconductor Physics
    Solid state Physics
    Semiconductor Physics
    Soft Condensed Matter Physics
    Computational Methods in Condensed Matter
    Advanced Statistical Physics
    Non-equilibrium Statistical Physics 
     Optics and Spectroscopy
    Methods of  Spectroscopy and Microscopy
    Quantum Optics 
    Non-linear Optics 
    Laser Physics
     Non-linear dynamics and Complex Systems
     Non-linear Dynamics and Chaos
    Advanced Non-linear Dynamics 
    Advanced Statistical Physics
    Classical Mechanics 
     Quantum Physics
    Foundations of Quantum Theory
    Quantum Optics
    Quantum Information and Computing
     

    Syllabus:

    PaperText / Ref. BooksSyllabus
    Electromagnetism
    (1) D J Griffiths Introduction to Electrodynamics (4th Edition)
    Vector Analysis (Ch 1.1-1.5); Curvilinear Coordinates. Electrostatics (Ch 2 and 3.4); Electric Fields in Matter (Ch 4.1-4.3 and 4.4.1); Magnetostatics (Ch 5); Magnetic Fields in Matter (Ch 6); Boundary value problems in Electrostatics and Magnetostatics. Green functions for the Laplacian operator in various coordinate systems for various Boundary conditions. Time dependent fields and Electromagnetic Induction. Electrodynamics (Ch 7); Maxwell's equations. Electromagnetic potentials, Gauge Invariance, The Coulomb and Lorentz Gauges. Propagation of Electromagnetic Waves in dielectric and conducting media.(9.2). Poynting's theorem, and conservation of energy and momentum in electromagnetism. Fresnel relations for reflection and refraction of electromagnetic waves at a plane interface between two dielectric media.
    (2) Reitz & Millford, (3) Panofsky & Phillips. (4) Electrodynamics by J.D. Jackson.
    Quantum Physics
    (1) D J Griffiths, Intro to QM, 2nd edition
    Old Quantum Theory, De-Broglie waves, Planck's equation E = h nu, Bohr-Sommerfeld Quantisation rule. Bohr's theory of the Hydrogen atom. Heisenberg's Uncertainty Principle. Franck-Hertz, Davission-Germer and the Stern-Gerlach experiments. Formalism (Ch 3), Wave function and its properties (Ch 1), Time dependent and Time independent Schroedinger Equation. The Continuity Equation, Ehrenfest's theorem. Non-Commuting operators and the Uncertainty Principle, Energy eigenvalue problems in 1-d (Ch 2), Potential Barriers and scattering, Angular momentum and spin (Ch 4, section 3,4), Energy eigenvalue problems in 3-d: a) the spherical well, b) 3-d isotropic SHO, c) The Hydrogen Atom. Operator formalism, creation and destruction operators for the 1d- Harmonic Oscillator.
    (2) R Shankar, (3) Merzbacher, (4) Schiff, (5) Cohen-Tannoudji.
    Thermal and Statistical Physics
    (1) Thermodynamics, Kinetic Theory and Statistical Thermodynamics by Sears and Salinger. (2) Statistical Mechanics by Kerson Huang.
    Thermodynamics, Equation of state, Heat , Work and Temperature. Zeroth, First, and second Laws of Thermodynamics. Clausius inequality, and calculation of changes in entropy. The d-slash Q Equations and the TdS equations. Legendre Transformations and the Thermodynamic Potentials, Maxwell's Relations. Statistical basis of thermodynamics (Ch 1); Classical statistical mechanics: Introduction to statistical approach; Ensembles; Microcanonical ensemble; Maxwell Boltzmann distribution; Canonical Ensemble; Grand Canonical Ensemble (Chs 2, 3, and 4); Quantum Statistics: Identical particles; Microcanonical ensemble; Fermi and Bose statistics;
    (3) Statistical Mechanics by Pathria.
    Classical Mechanics
    (1) Classical Mechanics: Goldstien, Safko and Poole,
    Variational principles, Principle of virtual work, Holonomic and non-Holonomic Constraints, actual and virtual displacements, Cartesian and generalised coordinates. Forces of Constraint, Velocity dependent Forces, and the generalised potential. Euler-Lagrange equations of motion (Ch 2); The Central force problem (Ch 3); Small Oscillations (Ch 6); Hamilton's equations of motion (Ch 8); Canonical transformation (Ch 9); Non-inertial frames of reference and fictitious forces. Accelerated frames of reference. Coriolis and Centrifugal Forces. Rigid Body dynamics. The spherically symmetric top. Connection between symmetries and conservation laws.
    (2) Classical Mechanics by Rana & Jog; (3) Classical Mechanics by Michele Calkin
    Astronomy and Astrophysics
    1.Astrophysics for physicists by
    Arnab Rai Choudhuri (ARC)

    Topics from ARC:
    Distances, Masses and Time scales,Brightness, Flux and Luminosity, distance modulus, aparent magnitude, optical, radio and X-ray astronomy (ch 1), Interaction of radiation with matter - radiative transfer equation, optical depth, Thermodynamic equilibrium (ch 2), Stellar astrophysics I: hydrostatic equillibrium, virial theorem, energy transport inside stars, stellar models, stellar quantities - mass-luminosity relations, HR-diagram, red giants, white dwarf (ch 3), Stellar astrophysics II: nuclear reaction rates, nuclear reactions in stellar (ch 4), End states of stellar collapse: degeneracy pressure of a Fermi gas, white dwarf, Chandrasekhar limit, neutron star, Pulsars: binary pulsar and tesing GTR (ch 5)
    Topics from IGNOU material:
    Star formation: Jean's criteria, Protostar and Main sequence, Supernovae, dark matter, rotation curve.
    2. IGNOU Study material
    General Theory of Relativity and Cosmology
    (1) A short course in General Relativity, Foster & Nightingale
    Vector and tensor field(Ch 1), Spacetime of GTR, Geodesics, Parallel transport, Absolute derivatives,Covariant derivative, Gravitational potentials and Newton's law of gravitation(Ch 2), Riemann tensor, Ricci tensor and Ricci scalar and their properties, parallel transport, Einstein field equation, the Schwarzschild solution (Ch 3), FRW metric and cosmology(Ch 6)
    (2) Spacetime and Geometry-An Introduction to General Relativity -Sean M Carroll
    Quantum Field TheoryQuantum Field Theory - Mandl and ShawClassical Field Theory (Action Principle, Lagrangian and Hamiltonian dynamics, Symmetries and Conservation Laws); Canonical Quantisation; Real and Complex Scalar Field; The Dirac Field; The Vector Field; The S-matrix; Feynman Diagrams and Rules; Processes to Lowest order
    Particle Physics
    (1) Modern Particle Physics by
    Mark Thompson(MT)
    Fundamental particles and forces, Natural units; collider accelerators, (Ch 1), review of non-relativistic quantum mechanics and special relativity(Ch 2), Fermi’s golden rule, phase space, particle decays, cross sections, relativistic kinematics(Ch 3), Klein-Gordon equation, Dirac equation and their solutions(Ch 4), Feynman diagrams and virtual particles, introduction to QED, Feynman rules for QED(Ch 5), electron-positron annihilation of MT(Ch 6 - helicity basis calculation) or Ch 6 of HM(normal techniques)),Neutrino oscillations(Ch 13), electron-
    Gauge symmetries( section 14.1 to 14.3 of H M)
    (2) Quarks and Leptons: Halzen and Martin, (3) Introduction to Elementary Particle Physcis: D J Griffiths
    Nuclear PhysicsIntroductory Nuclear Physics - Kenneth S. Krane, Wiley India EditionBasic Concepts, Nuclear Properties & Force (Ch 1, 3 & 4), Nuclear Model (Liquid drop & Shell model, Ch 5), Nuclear decay (Alpha, beta, Gamma; Ch 8, 9 &10)
    Advanced Quantum Physics
    (1) Modern Quantum Mechanics by Sakurai and Napolitano;
    Symmetry in Quantum Mechanics (ch 4), Time independent perturbation theory, time dependent perturbation theory, Zeeman effect, Transition probability, constant and harmonic perturbation, Absorption and stimulated emission decay width (ch 5), Identical particles (sections 6.1 and 6.2 of ch 6),
    Lippmann-Schwinger equation,Born approximation,optical theorem, Partial wave analysis (ch 7) of Sakurai.
    Relativistic QM (Special Relativity, KG equation and it's solution, Dirac equation and it's solution (rest frame, lab frame), Maxwell's equation (free photon solution), spin, parity, time-reversal and charge-conjugation (H M: Quarks and Leptons..(e.g.)
    (2) Quantum Mechanic by D J Griffith. (3) For Relativistic QM: (a) Quarks & Leptons, An introductory course in Modern Particle Physics by Halzen & Martin or (b) Modern Particle Physics by Mark Thompson(MT)
    Solid State Physics
    (1) C Kittel Introduction to Solid State Physics
    Basic Crystal Structure: crystal structure, indexing system, reciprocal lattice, diffraction condition, structure factor (Ch 1, Ch 2); Lattice dynamics: phonons, phonon heat capacity, density of states, Einstein and Debye Model, Thermal conductivity (Ch 4, Ch 5); Band structure: Free electron gas, heat capacity, Thermal and electrical conductivity, Hall effect, nearly free electron model, Bloch functions, Kronig-Penney Model, band gap, equation of motion, Fermi surface (Ch 6 to Ch 9); Magnetism: Diamagnetism, Paramagnetism, Ferromagnetism, Antiferromagnetism (Ch 11, Ch12).
    (2) N W Ashcroft and N D Mermin, Solid State Physics, Thomson (1976). (3) M A Wahab Solid State Physics, Structure and Properties of Materials, 2nd ed, Narosa (2005)
    Soft Condensed Matter Physics(1) Soft Condensed Matter by R. A. L. Jones (RALJ), (2) Intermolecular and surface forces by Jacob N. Israelachvili (JNI), (3) An introduction to polymer physics by David I. Bower (DIB)1. Intermolecular forces: Van der Waals forces-Debye, Keesom and London forces, Hamaker constant, Entropic forces (Ch 4.3.1, 4.3.2 of RALJ, Ch 4.7, 4.8, 5.1, 5.2 and 11.1 of JNI) 2. Viscoelastic materials: Shear thinning and shear thickening, creep and stress relaxation behaviors, dynamic response, rheometers (Ch 5.5.1 RALJ, Ch 7.1-7.4 DIB) 3. Glasses: Vogel-Fulcher equation, microscopic picture, kinetics (Ch 2.4 RALJ) 4. Polymers: The freely jointed chain, Flory model, good, bad and theta solvent, Kuhn length and persistence length, polymers at interfaces (Ch 5 RALJ) 5. Colloids: Brownian motion, DLVO theory, depletion interactions, stabilisation of colloids, light scattering experiments, self-assembled structures. (Ch 4 RALJ) 6. Supramolecular self-assembly: Bilayers, micelles and surfactants (Ch 9 RALJ) 7. Liquid crystals: phases, nematic/isotropic transition, defects, electrical and magnetic properties (Ch 7 RALJ).
    Semiconductor Physics
    (1) Physics of Semiconductor Devices by J. P. Colinge & C. A. Colinge
    Doping in semiconductor, Carrier transport, Generation / Recombination Phenomena, Semiconductor growth process and characterisation, Device building blocks- p-n Junctions, Metal-semiconductor contacts, Metal – Insulator - Semiconductor capacitors, JFET, MESFET, MOSFET, Hetero-junction Devices, Photonic Devices, Quantum effect devices, SET, Tunnelling transport, Spintronics - Semiconductor and Spin Physics
    (2) The Physics of Low-dimensional Semiconductors by J. H. Davis (3) Semiconductor Physics and Devices by D. A. Neamen (4) Semiconductor Devices, Physics & Technology by S. M. Sze
    Non Equilibrium Statistical MechanicsElements of Nonequilibrium Statistical Mechanics, V. BalakrishnanLangevin equation (Ch 2); Fluctuation-dissipation relation (Ch 3); Velocity autocorrelation (Ch 4); Markov process (Ch 5); Fokker-Planck equation (Ch 6); Diffusion (Ch 7 & 8); Brownian motion (Chs 9, 10, 11 ); Diffusion in an external potential (Ch 13); Linear response theory (Appendix I)
    Nonlinear Dynamics and ChaosNonlinear Dynamics &Chaos, Steven StrogatzBifurcations in 1-D systems (Ch-3), Stability, phase potraits in 2-D systems (Ch 5-6), Nonlinear center - conservative & Reversible systems (Ch-6), Index theory (Ch-6), Limit cycles (Ch-7), Local & global bifurcations in 2-D systems (Ch-8), Chaos in flows (Ch-9), 1-D Maps(Ch-10), Fractals (Ch-11), Strange attractors (Ch-12)
    Advanced Nonlinear DynamicsChaos in Dynamical Systems, Edward Ott(EO) ; Chaos and nonlinear dynamics , Hilborn(H); Nonlinear dynamics and chaos, Steven Strogatz(SS)Computation of Lyapunov exponents (Sec 4.4 EO) ; Fractal basin boundary; Crisis (Sec 5.1-5.3 EO); Quasiperiodicity and mode locking (Ch 6 EO, Ch 6 H); Chaos in Hamiltonian systems (Ch 7 EO); Universality - Feigenbaum constant, etc (Appendix F in H, Sec 9.4 H; Perturbation approach (Multuple time scale, Poincare-Lindest, Signular peturbation) (Sec 7.6 SS)
    Classical Optics
    (1) Optics, Ajoy Ghatak, 7th Edition, Tata Mcgraw Hill (2021)
    Electromagnetic Waves (Ch 22), Reflection and refraction of e-m waves (Ch 22), Group velocity and pulse dispersion, Chirped pulse amplification (Ch 11), Superposition of waves and interference ((Ch 12-15), Coherence (Ch 16), Fraunhofer diffraction (Ch 17-18), Fresnel diffraction (Ch 19), Polarisation and Double Refraction (Ch 21), Lasers (Ch 27)
    (2) Optics, Eugene Hecht, 4ed, 2002
    Quantum OpticsIntroductory Quantum Optics, Gerry and Knight, CUPEM Field Quantisation (Ch 2),Coherent States (Ch 3),Atom-field interactions, Rabi model, Jaynes-Cummings model (Ch 4, sec 1-5), Quantum Coherence (Ch 5), Non classical light (Ch 7), Beam-splitters and interferometers: Single photon experiments (Ch 6)
    Topics in Nonlinear Optics1) Nonlinear Optics by R.W. Boyd, Elsevier; 2) Lasers and nonlinear optics by B.B. Laud, New Age International (India).Lorentz model, properties of tensor elements; Second order processes, phase matching in crystals; Third order processes (third harmonic generation, phase conjugation, Kerr effect, self-phase modulation, Raman effect, Stimulated Raman scattering (Stokes / anti-Stokes), Stimulated Brillouin scattering); Light interaction with plasma (waves in plasmas, Landau damping, absorption of light by inverse Bremsstrahlung, resonance absorption, two plasmon absorption, parametric decay, stimulated Raman scattering, stimulated Brillouin scattering); above threshold ionisation, odd harmonic generation, optical field ionisation, Coulomb explosion; Applications : Holography (low intensity), optical solitons (medium intensity), inertial confinement fusion (high intensity) and acceleration of charged particles with light (ultra-high intensity).
    Laser Physics
    1. Laser Physics, S. Hooker and C. Webb, Oxford Univ. ; 2. Laser Fundamentals, W. T. Silfvast, Cambridge University.
    1) Laser science: Laser basics, theory of radiation, longitudinal modes, theory of optical resonators, transverse modes, properties of laser beams, Line broadening mechanisms.; 2) Laser technology: Laser optics, transient behaviour, mode locking, laser amplifiers; 3) Physics of various lasers: Masers, solid state lasers, semiconductor lasers, fibre lasers. liquid (dye) lasers, gas lasers, x-ray lasers, free electron laser.
    1) Lasers: Theory and Applications, K. Thyagarajan and A. K. Ghatak, Macmillan, India. 2) Optical Electronics, A. K. Ghatak and K. Thyagarajan, Cambridge Univ.
    Foundation of Quantum PhysicsQuantum Theory: Concepts and Methods, Asher PeresRandomness in quantum theory, meaning of measurement (Ch 1), Quantum tests and inference (Ch 2), Quantum Mechanics and complex vector spaces, mixed states (Ch 3), Composite systems: Correlations, Partial trace, Schmidt decomposition (Ch 5, sec 1-4), Bell's Theorem (Ch 6), Contextuality (Ch 7) Information and Thermodynamics (Ch 9), Measurement (ch 12)
    Quantum Information and Computation(1) Quantum Physics and Information Processing, Radhika Vathsan, CRC Press 2015; (2) Quantum computation and quantum Information, M A Nielsen and I ChuangBasic properties of finite dimensional quantum systems (Ch 3), Qubits and illustration using spin-half (Ch 2), Bloch sphere representation and other properties including entanglement, EPR and Bell's theorem (Ch 4), Mixed states and open quantum systems (Ch 5), Quantum gates and circuits (Ch 7), Simple quantum Algorithms: Deutsch-Josza, Simon, QFT, Period-finding, Shor Algorithm, Grover Algorithm (Ch 8) , Quantum communication: Key distribution and teleportation (Ch 9) , Simple ideas of Quantum Error correction (Ch 10).
     

PhD Openings

Last date: 26 June 2023 
 We invite PhD applicants for research  in the  following areas:
 
 Experimental Condensed Matter 
Computational Condensed Matter
 High Energy Theory
 
Quantum Optics
Quantum Information and Computation
 

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