Ladder operators with no vacuum, their coherent states, and an application to graphene
Fuente:
arXiv
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866929219464855552 |
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| author | Bagarello, Fabio |
| author_facet | Bagarello, Fabio |
| contents | In literature ladder operators of different nature exist. The most famous are those obeying canonical (anti-) commutation relations, but they are not the only ones. In our knowledge, all ladder operators have a common feature: the lowering operators annihilate a non zero vector, the {\em vacuum}. This is connected to the fact that operators of these kind are often used in factorizing some positive operators, or some operators which are { bounded from below}. This is the case, of course, of the harmonic oscillator, but not only. In this paper we discuss what happens when considering lowering operators with no vacua. In particular, after a general analysis of this situation, we propose a possible construction of coherent states, and we apply our construction to graphene. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_12239 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Ladder operators with no vacuum, their coherent states, and an application to graphene Bagarello, Fabio Quantum Physics Mathematical Physics In literature ladder operators of different nature exist. The most famous are those obeying canonical (anti-) commutation relations, but they are not the only ones. In our knowledge, all ladder operators have a common feature: the lowering operators annihilate a non zero vector, the {\em vacuum}. This is connected to the fact that operators of these kind are often used in factorizing some positive operators, or some operators which are { bounded from below}. This is the case, of course, of the harmonic oscillator, but not only. In this paper we discuss what happens when considering lowering operators with no vacua. In particular, after a general analysis of this situation, we propose a possible construction of coherent states, and we apply our construction to graphene. |
| title | Ladder operators with no vacuum, their coherent states, and an application to graphene |
| topic | Quantum Physics Mathematical Physics |
| url | https://arxiv.org/abs/2401.12239 |