## Search found 5 matches

- 02 Apr 2020, 01:10
- Forum: HowTos and FAQ for TeNPy
- Topic: Define spin-1 Boson site
- Replies:
**0** - Views:
**7**

### Define spin-1 Boson site

Dear Community, How we can define the spin-1 Boson site for the following Hamiltonian: H = - t \sum_{i, \sigma} \left(b^\dagger_{i, \sigma} b_{i+1, \sigma} + H.c. \right) + U_1 \sum_i n_{i, \sigma}\left(n_{i, \sigma}-1\right) + U_2 \sum_i \mathbf{S}_i^2 where spin operator \mathbf{S}_i = \sum_{\sigm...

- 24 Mar 2020, 01:22
- Forum: HowTos and FAQ for TeNPy
- Topic: Adding disorders and adding a site to 1D SSH chain
- Replies:
**2** - Views:
**336**

### Re: Adding disorders and adding a site to 1D SSH chain

Hi Johannes, it is greatly appreciated.

- 24 Mar 2020, 01:20
- Forum: HowTos and FAQ for TeNPy
- Topic: 2D DMRG with boundary conditions and lattice index
- Replies:
**2** - Views:
**47**

### Re: 2D DMRG with boundary conditions and lattice index

Hi Johannes, thank you very much. I got it.

- 22 Mar 2020, 04:58
- Forum: HowTos and FAQ for TeNPy
- Topic: 2D DMRG with boundary conditions and lattice index
- Replies:
**2** - Views:
**47**

### 2D DMRG with boundary conditions and lattice index

Hi everyone: (1) I want to simulate a self-defined 2D lattice with Finite lattice sizes along both the x and y directions. I am not sure how to define the boundary conditions. Is it the right way to define the boundary condition like this: class Mylattice(lattice.Lattice): def __init__(self, Lx, Ly,...

- 15 Mar 2020, 06:32
- Forum: HowTos and FAQ for TeNPy
- Topic: Adding disorders and adding a site to 1D SSH chain
- Replies:
**2** - Views:
**336**

### Adding disorders and adding a site to 1D SSH chain

Hello, TeNPy community, I want to simulate the following Boson-Hubbard Hamiltonian on a simple SSH chain: H = \sum_i \left(t_1 b_i^\dagger a_i + t_2 a_{i+1}^\dagger b_i + H.c.\right) + \sum_i (U_1 a_i^\dagger a_i a_i^\dagger a_i + U_2 b_i^\dagger b_i b_i^\dagger b_i) + \sum_i (V_i a_i^\dagger a_i + ...