Quantum matter and many-body methods

Study emergent quasiparticles, bands, interacting fermions, condensates, topological phases, and entanglement diagnostics.

10 published lessons1 module356 min of guided study
  1. 01
    Quantum matter and many-body methodsresearch · 10 lessons

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Quantum matter and many-body methods

Study emergent quasiparticles, bands, interacting fermions, condensates, topological phases, and entanglement diagnostics.

  1. 01

    Second quantization and lattice Hamiltonians

    Build many-particle lattice models from occupation states, fermionic operators, hopping, and local interactions.

    40 min
  2. 02

    Bloch bands and reciprocal space

    Derive crystal momentum, Brillouin-zone equivalence, and the tight-binding band of a periodic chain.

    40 min
  3. 03

    Phonons and collective modes

    Find normal modes of a harmonic chain and explain why quantizing their collective motion produces phonons.

    40 min
  4. 04

    Fermi surfaces and Fermi liquids

    Count a filled Fermi sea and explain how long-lived interacting quasiparticles organize low-energy metallic behavior.

    44 min
  5. 05

    Hartree–Fock and variational states

    Optimize an antisymmetric product state, separate direct and exchange energies, and diagnose the limits of self-consistent mean field.

    44 min
  6. 06

    The Hubbard model and Mott localization

    Separate interaction-driven charge localization from a filled-band insulator and derive superexchange in a controlled limit.

    29 min
  7. 07

    Bose condensation and Bogoliubov theory

    Derive the excitation scale of a dilute repulsive Bose gas and separate condensation, coherence, and superfluid response.

    28 min
  8. 08

    BCS pairing and superconductivity

    Build a paired fermionic variational state, calculate its gapped excitations, and identify the limits of weak-coupling mean field.

    30 min
  9. 09

    Berry phase and topological bands

    Distinguish gauge-dependent band eigenvectors from geometric phases and calculate a symmetry-protected one-dimensional winding.

    30 min
  10. 10

    Entanglement and tensor-network states

    Use Schmidt weights to quantify bipartite entanglement and understand when matrix-product states compress quantum matter.

    31 min
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