v1.3 : February 25, 2022

• Major functionality updates: massive speed ups! The subsidiary hsearch now uses analytical derivatives to compute the Jacobian matrix needed for the Newton search for h (Lagrange multipliers) which saves an enormous number of finite differencing calculations and allows the Newton to converge faster (~3-10 times faster). SCFloop was updated as well to use a Broyden algorithm instead of simple fixed iteration to solve for spinon-subsidiary self-consistency: this is about 3-5 times faster.
• Bug fixes: buildHspinon had an indexing bug when the newly implemented <O><O> scaling of d-d hoppings were included; this is a small thing anyways but now it is computed correctly.
• Various small improvements to comments and printouts (time stamps, etc.)

v1.2 : February 16, 2021

• Minor functionality updates: multiple small bug fixes and tweaks
• Main changes are more details on examples and renaming of "slave" to "subsidiary" in response to edits needed to publish the CPC v1.1 paper https://www.sciencedirect.com/science/article/pii/S001046552100103X

v1.1: May 30, 2020

• User-end enhancement: sparse matrices and sparse diagonalization of the slave Hamiltonian are now supported via input options. This saves both time and memory for large boson problems.
• Tutorial enhancement: added example 4 on 5-atom LaNiO3, band renormalization, and effect of Hund's J on the multiplet structure of the Ni eg subsystem.
• Code enhancements:
  • A large set of comment fixes and variable renamings.
  • (Almost) all slave variables moved into "slaveinfo" struct.
  • (Almost) all spinon variables moved into "spinininfo" struct.

v1.0: July 14, 2018

• Initial release of BoSS code to the public