Search found 6 matches
- 22 Oct 2022, 12:44
- Forum: HowTos and FAQ for TeNPy
- Topic: Bose-Hubbard Model Single Particle Excitation Gap
- Replies: 2
- Views: 3033
Re: Bose-Hubbard Model Single Particle Excitation Gap
One suggestion I can give is that you first keep the density fixed( say \rho=1 ). Start with some system size(say L=40). Then find E_0 (N+1),E_0 (N),E_0(N-1) . N=\rho \times L . Find \mu^{+} , \mu^{-} . Now keep increasing the system size and correspondingly find \mu^{+} , \mu^{-} . Extrapolate for ...
- 27 Apr 2021, 14:16
- Forum: HowTos and FAQ for TeNPy
- Topic: Neutral Energy Gap in the extended Boson Hubbard Model
- Replies: 4
- Views: 3309
Re: Neutral Energy Gap in the extended Boson Hubbard Model
Thank you for your suggestion. I will try this method
- 27 Apr 2021, 07:30
- Forum: HowTos and FAQ for TeNPy
- Topic: Neutral Energy Gap in the extended Boson Hubbard Model
- Replies: 4
- Views: 3309
Re: Neutral Energy Gap in the extended Boson Hubbard Model
My model is softcore bosons. For computational purposes, I have truncated the Hilbert space to a maximum of two bosons per site. Also, do I have to find the correlation length only for the ground state or for both the ground state and excited state of the system? I am unable to understand how the co...
- 18 Apr 2021, 05:54
- Forum: HowTos and FAQ for TeNPy
- Topic: Neutral Energy Gap in the extended Boson Hubbard Model
- Replies: 4
- Views: 3309
Neutral Energy Gap in the extended Boson Hubbard Model
I am trying to evaluate the neutral energy gap of the extended Boson Hubbard model in one dimension. (Neutral Energy Gap = E_n = E^{1}_N - E^{0}_N ) where E^{1}(N) is the energy of the first excited state of the hamiltonian and E^{0}(N) is the ground state energy. N is the number of Bosons in the sy...
- 15 Apr 2021, 17:14
- Forum: Implementations
- Topic: Keeping number of particles fixed at edges
- Replies: 1
- Views: 11893
Keeping number of particles fixed at edges
I am currently trying to calculate the charge gap E_c = E^{0}(N+1) + E^{0}(N-1) - 2 E^{0}(N) and the neutral gap E_n = E^{1}(N) - E^{0}(N) of the extended Boson Hubbard model in one dimension. ( E^{1}(N) is the energy of the first excited state , E^{0}(N) is the energy of the ground state. N is the ...
- 14 Apr 2021, 18:35
- Forum: HowTos and FAQ for TeNPy
- Topic: Excited states using tenpy
- Replies: 13
- Views: 10806
Re: Excited states using tenpy
If the energies of the eigenstates are greater than 0, how do we then find the excited states and their corresponding energies?