In second quantization one the Particle hole trasnformation is defined as ˆCˆψAˆC−1=∑BU∗†A,Bˆψ†BˆCˆψ†AˆC−1=∑BˆψBU∗B,AˆCiˆC−1=+i
Source: Topological phases: Classification of topological insulators and superconductors of non-interacting fermions, and beyond Equation 17
Monday, 2 March 2015
quantum mechanics - Particle hole symmetry in 2nd quantization
And if in a 2nd quantized Fermionic Hamiltonian (ˆH) Particle Hole symmetry is present then ˆCˆHˆC−1=ˆH
I want to see what this equation means in single particle basis. In single particle basis I can write the 2nd quantized Hamiltonian (ˆH) as ˆH=∑A,Bˆψ†AHA,BˆψB
Here the matrix H is the Hamiltonian in single particle basis. Now, with the transformation rules on should get UH∗U†=−H
In the single-particle basis. But what I am getting using the transformation rules is U∗HU∗†=−H
Now I have started to think whether the transformation rules given here are right or not. I wanted to know if the transformation rule or my calculation is wrong.
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