Quantum basics Definition and 86 Threads

  1. Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 29: Representing a moving particle by a wave packet

    Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 29: Representing a moving particle by a wave packet

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  2. Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 30: Stationary-state Schrodinger equation

    Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 30: Stationary-state Schrodinger equation

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  3. Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 31: Solution of the stationary-state Schrodinger equation for a SHO

    Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 31: Solution of the stationary-state Schrodinger equation for a SHO

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  4. Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 32: Equivalance of Heisenberg and the Schrodinger formulations I

    Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 32: Equivalance of Heisenberg and the Schrodinger formulations I

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  5. Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 33: Equivalance of Heisenberg and Schrodinger formulations II

    Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 33: Equivalance of Heisenberg and Schrodinger formulations II

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  6. Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 34: Born interpretation of the wavefunction

    Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 34: Born interpretation of the wavefunction

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  7. Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 35: Uncertainty principle and its simple applications

    Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 35: Uncertainty principle and its simple applications

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  8. Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 36: Time dependent Schrodinger equation

    Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 36: Time dependent Schrodinger equation

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  9. Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 37: Ehrenfest theorem

    Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 37: Ehrenfest theorem

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  10. Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 38: Solution of Schrodinger equation for a particle in delta functions

    Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 38: Solution of Schrodinger equation for a particle in delta functions

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  11. Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 39: Solution of Schrodinger equation for a particle in a finite well

    Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 39: Solution of Schrodinger equation for a particle in a finite well

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  12. Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 40: Solution of a one dimensional Schrodinger equation for bound states I

    Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 40: Solution of a one dimensional Schrodinger equation for bound states I

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  13. Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 41: Solution of a one dimensional Schrodinger equation for bound states II

    Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 41: Solution of a one dimensional Schrodinger equation for bound states II

    All copyright reserved to Prof. Harbola and NPTEL, Govt. of India. Duplication punishable offence. Course Website: http://www.nptel.ac.in/courses/115104096/
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  14. Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 42: Reflection and transmission of particles across a potential barrier

    Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 42: Reflection and transmission of particles across a potential barrier

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  15. Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 43: Quantum-tunneling and its examples

    Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 43: Quantum-tunneling and its examples

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  16. Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 44: Solution of the Schrodinger for free paticles and periodic boundary cond

    Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 44: Solution of the Schrodinger for free paticles and periodic boundary cond

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  17. Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 45: Electrons in a metal : Density of states and Fermi energy

    Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 45: Electrons in a metal : Density of states and Fermi energy

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  18. Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 46: Schrodinger equation for particles in spherically symmetric potential

    Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 46: Schrodinger equation for particles in spherically symmetric potential

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  19. Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 47: Angular momentum operator and its eigenfunctions

    Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 47: Angular momentum operator and its eigenfunctions

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  20. Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 48: Equation for radial component of the wavefunction

    Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 48: Equation for radial component of the wavefunction

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  21. Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 49: Solution for radial component of the wavefunction for the hydrogen atom

    Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 49: Solution for radial component of the wavefunction for the hydrogen atom

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  22. Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 50: Soln. for radial component of wavefunction for spherically sym potential

    Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 50: Soln. for radial component of wavefunction for spherically sym potential

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  23. Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 51: Bloch's theorem

    Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 51: Bloch's theorem

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  24. Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 52: Kroning-Penny model and energy bands

    Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 52: Kroning-Penny model and energy bands

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  25. Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 53: Kroning-Penny model with periodic Dirac delta function and energy bands

    Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 53: Kroning-Penny model with periodic Dirac delta function and energy bands

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  26. Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 54: Discussion on Bands

    Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 54: Discussion on Bands

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  27. Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 55: Summary of the Course

    Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 55: Summary of the Course

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  28. Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 4: Black Body Radiation IV

    Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 4: Black Body Radiation IV

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  29. Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 5: Black Body Radiation V

    Introductory Quantum Mechanics with Prof. Manoj Harbola (NPTEL):- Lecture 5: Black Body Radiation V

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  30. D

    I How Do Indices Determine Positions in a Quantum Density Matrix?

    I am reading Leonard Susskind's Theoretical Minimum book on Quantum Mechanics. Excercise 7.4 is as follows: Calculate the density matrix for ##|\Psi\rangle = \alpha|u\rangle + \beta|d\rangle##. Answer: $$ \psi(u) = \alpha, \quad \psi^*(u) = \alpha^* \\ \psi(d) = \beta, \quad \psi^*(d) =...
  31. Adiater

    I Double-Slit Interference w/ Separate Sources

    If you have two similar coherent sources which are separated from each other by a barrier. Now one source sends particles one by one into one slit and the other sends particles into the other in a double slit interference experiment. Now, the photons are always undistinguishable, so they should...
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    • Coherent Double slit interference Interference Photons Quantum basics Sources
    • Replies: 12
    • Forum: Quantum Physics
  32. B

    Question on correctly interpreting a bra-ket equation

    I am trying to solve for the uncertainty in energy ##\Delta E## in the following exercise: $$\Delta E = \sqrt{\langle \Phi | (\hat H - \bar E )^2 | \Phi \rangle}$$ Questions What does ##(\hat H - \bar E )^2## mean? Is it a simple binomial expansion into ##\hat H^2 - 2 \bar E \hat H + \bar...
  33. B

    I For a particle on a sphere, is zero energy possible?

    In my introduction to quantum mechanics, I learned about the particle in a box, followed by the quantum harmonic oscillator. In both instances, zero energy was not possible; the ground states had non-zero energy. However, in deriving the solutions to the Schrödinger equation for a particle on a...
  34. Robert Shaw

    What's the energy-spread of the quantum Universe state?

    If the universe was in an energy eigenstate then d<A>/dt = 0 for any dynamic variable A. Stuff moves which implies that the Universe isn't in an eigenstate. What factors drive the energy spread?
  35. kal

    I Trouble understanding the idea of a cavity radiator being a Black Body

    I have been trying to understand the role of a cavity as a black body radiator in the derivation of planks black body radiation law but it has left me with 5 main questions: 1. If an object is a perfect absorber it must also be a perfect emitter, meaning that (allowing for a cavity not being a...
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    • Black body Black body radiation Body Cavity Emissivity Idea Quantum basics Radiator Thermodaynamics Thermodyamics
    • Replies: 9
    • Forum: Quantum Physics
  36. A

    I Physical interpretation of a Hamiltonian with a constraint

    Dear physics forums, What is the physical interpretation of imposing the following constrain on a Hamiltonian: Tr(\hat H^2)=2\omega ^2 where \omega is a given constant. I am not very familiar with why is the trace of the hamiltonian there. Thanks in advance, Alex