半导体物理学半导体 (12).pdf
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1、Allowed and Forbidden Energy Bands Formation of Energy Bands 02Energy level and band03Pauli exclusion principle01The KronigPenney Model 04The k-Space Diagram 05Pauli exclusion principleThe Pauli(泡利)exclusion principle was proposed by Pauli on January 16,1925.It is impossible for two or more electron
2、s in an atom to be in the same state.The state of an electron can be represented by four quantum numbers(n,m,l,s),then it is impossible for two or more electrons in an atom to have exactly the same four quantum numbers.Pauli(泡利)Spin upSpin downBand formationProbability density function of an isolate
3、d hydrogen atom.(d)Overlapping probability density functions of two adjacent hydrogen atoms.The wave functions of two electrons overlapThe splitting of the n=1 state.Split into energy bandsEnergy level and bandEnergy level will split into a band of energy levelsForbidden band Conduction bandSchemati
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