Add emery and Haldane model Hamiltonians

doc/releases/changelog-dev.md

@@ -4,6 +4,10 @@
 
 <h3>New features since last release</h3>
 
+* Functions are added for generating spin Hamiltonians for [Emery](https://arxiv.org/pdf/2309.11786)
+  and [Haldane](https://arxiv.org/pdf/2211.13615) models on a lattice.
+  [(#6201)](https://github.com/PennyLaneAI/pennylane/pull/6201/)
+
 <h3>Improvements 🛠</h3>
 
 * Improve unit testing for capturing of nested control flows.
@@ -68,6 +72,7 @@ This release contains contributions from (in alphabetical order):
 
 Guillermo Alonso,
 Utkarsh Azad,
+Diksha Dhawan
 Lillian M. A. Frederiksen,
 Christina Lee,
 William Maxwell,

pennylane/spin/__init__.py

@@ -16,4 +16,4 @@
 """
 
 from .lattice import Lattice
-from .spin_hamiltonian import fermi_hubbard, heisenberg, transverse_ising
+from .spin_hamiltonian import emery, fermi_hubbard, haldane, heisenberg, transverse_ising