SciPost Phys. 7, 020 (2019) ·
published 9 August 2019
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· pdf
We present a major update to QuSpin, SciPostPhys.2.1.003 -- an open-source
Python package for exact diagonalization and quantum dynamics of arbitrary
boson, fermion and spin many-body systems, supporting the use of various
(user-defined) symmetries in one and higher dimension and (imaginary) time
evolution following a user-specified driving protocol. We explain how to use
the new features of QuSpin using seven detailed examples of various complexity:
(i) the transverse-field Ising chain and the Jordan-Wigner transformation, (ii)
free particle systems: the Su-Schrieffer-Heeger (SSH) model, (iii) the
many-body localized 1D Fermi-Hubbard model, (iv) the Bose-Hubbard model in a
ladder geometry, (v) nonlinear (imaginary) time evolution and the
Gross-Pitaevskii equation on a 1D lattice, (vi) integrability breaking and
thermalizing dynamics in the translationally-invariant 2D transverse-field
Ising model, and (vii) out-of-equilibrium Bose-Fermi mixtures. This easily
accessible and user-friendly package can serve various purposes, including
educational and cutting-edge experimental and theoretical research. The
complete package documentation is available under
http://weinbe58.github.io/QuSpin/index.html.
SciPost Phys. 2, 003 (2017) ·
published 13 February 2017
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· pdf
We present a new open-source Python package for exact diagonalization and
quantum dynamics of spin(-photon) chains, called QuSpin, supporting the use of
various symmetries in 1-dimension and (imaginary) time evolution for chains up
to 32 sites in length. The package is well-suited to study, among others,
quantum quenches at finite and infinite times, the Eigenstate Thermalisation
hypothesis, many-body localisation and other dynamical phase transitions,
periodically-driven (Floquet) systems, adiabatic and counter-diabatic ramps,
and spin-photon interactions. Moreover, QuSpin's user-friendly interface can
easily be used in combination with other Python packages which makes it
amenable to a high-level customisation. We explain how to use QuSpin using four
detailed examples: (i) Standard exact diagonalisation of XXZ chain (ii)
adiabatic ramping of parameters in the many-body localised XXZ model, (iii)
heating in the periodically-driven transverse-field Ising model in a parallel
field, and (iv) quantised light-atom interactions: recovering the
periodically-driven atom in the semi-classical limit of a static Hamiltonian.
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