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By Oppenheimer J. R.

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C7-=(1 0 o 0). 71) The effect of the last term is to remove the zero point energy. The state vector can be thought of as a matrix in the Schrodinger picture or as the state Ina,nf > in this Fock space picture. Since the fermionic creation and annihilation operators obey anti-commutation relations, the fermion number is either zero or one. As stated before, we will choose the 30 Factorization of a General Hamiltonian ground state of HI to have zero fermion number. 72) Because of the anticommutation relation, n f can only take on the values 0 and 1.

The underlying reason for the degeneracy of the spectra of HI and H2 can be understood most easily from the properties of the SUSY algebra. 15) which contains both H1 and H2. This matrix Hamiltonian is part of a closed algebra which contains both bosonic and fermionic operators with commutation and anti-commutation relations. 17) 18 Factorization of a General Hamiltonian E"' 3 A r u A' E"' ___ E'Z' I 0 Fig. 1 Energy levels of two (unbroken) supersymmetric partner potentials. The action of the operators A and At are displayed.

Since the ground state wave function of H I is annihilated by the operator A, this state has no SUSY partner. Thus the picture we get is that knowing all the eigenfunctions of H1 we can determine the eigenfunctions of H2 using the operator A , and vice versa using At we can reconstruct all the eigenfunctions of H1 from those of HZ except for the ground state. This is illustrated in Fig. 1 . The underlying reason for the degeneracy of the spectra of HI and H2 can be understood most easily from the properties of the SUSY algebra.

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