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A quasiparticle of mass m is trapped by an extended crystal defect, which has a shape...

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Physics

A quasiparticle of mass m is trapped by an extended crystaldefect, which has a shape of a narrow, straight tube of length l.The quasiparticle hence is confined to move within this defect.Consider that the tube of this defect is sealed at both ends withpotential V = 0 inside the tube. Treat the defect as a 1D infinitesquare well. Assume that this tube defect is placed at an angle Θrelative to the surface of the earth. The quasiparticle experiencesthe usual gravitational potential V = mgh. Calculate the lowestorder change in the energy of the ground state due to thegravitational potential.

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