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Quantum mechanics describes the microscopic properties of nature in a regime where classical mechanics no longer applies. It explains phenomena such as the wave-particle duality, quantization of energy and the uncertainty principle and is generally used in single body systems. Use the quantum-field-theory tag for the theory of many-body quantum-mechanical systems.

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If I want do describe two particles #1 and #2 within Quantum Mechancis - let them be different in some way (Spin for example) - how do "I" decide if the total state of the system should be an entangle …
asked Jun 24 '15 by Thomas Elliot
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1answer
Sometimes we talk about experiments with photons in quantum mechanics. Examples: double slit with photons, experiment with entangled photons etc. Quantum mechanics is a non-relativistic theory (per …
asked Aug 15 '16 by Thomas Elliot
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I am currently reading "Quantum Field Theory for the Gifted Amateur". In chapter 2 Phonons are introduced as solutions (in k-space) of a coupled harmonic oscillator. In real space the oscillator is co …
asked Apr 18 '16 by Thomas Elliot
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If I have a 2DEG with a voltage in the $x$-direction and a $B$-Field in the $z$-direction (so I also get a hall-voltage in the $y$-direction (classicaly)). But if I do this stuff at low temperatures I …
asked Jul 28 '15 by Thomas Elliot
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Every explanation of the Aharonov–Bohm effect that I have seen seems to justify the phase that shows up due to different paths that the particles (electrons) take to reach some point in space. How do …
asked Nov 30 '16 by Thomas Elliot
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The Dirac Equation ("free Dirac") is a relativistic Equation of Motion (EoM) for a free ($V=0$) Spin $1/2$ particle (like an electron). The free Dirac equation is invariant under global phase transf …
asked May 21 '16 by Thomas Elliot
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I tried to solve the quantum harmonic oscillator via the operator method. After doing it and looking up the solution I noticed that for some reason the ladder operators got an additional factor of (i) …
asked Aug 5 '15 by Thomas Elliot
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I am reading something about a 2DEG (2-dimensional electrongas model) and can not understand it. My book says the ground state of the 2DEG is higher compared to a 3DEG because the confinement to 2D in …
asked May 12 '15 by Thomas Elliot