Hello, One question (maybe trivial - at least I hope so) - how can I evaluate <b>, where b is standard annihilation operator in Bose Hubbard model? Theoretically there is an information on the ALPS website (about defining custom measurements) how to do it, but... for example let's try simple thing: MEASURE_LOCAL[name]=b; What I get, is an information, that: "Will not measure "name" since it is off-diagonal or not a site operator". "b" is a site operator, so the problem is whether it is diagonal or not - but the only one constraint mentioned on the website is that operator must be a site operator - so is that information not full, or am I wrong somewhere here?
Help will be very apreciated Jakub
The expectation value of <b> is 0 since it breaks particle number conservation.
On Jun 17, 2009, at 8:41 PM, Jakub Kolasinski <jakub.kolasinski@gmail.com
wrote:
Hello, One question (maybe trivial - at least I hope so) - how can I evaluate <b>, where b is standard annihilation operator in Bose Hubbard model? Theoretically there is an information on the ALPS website (about defining custom measurements) how to do it, but... for example let's try simple thing: MEASURE_LOCAL[name]=b; What I get, is an information, that: "Will not measure "name" since it is off-diagonal or not a site operator". "b" is a site operator, so the problem is whether it is diagonal or not - but the only one constraint mentioned on the website is that operator must be a site operator - so is that information not full, or am I wrong somewhere here?
Help will be very apreciated Jakub
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