def andisp(hop=-1.,
dist='uniform',
loc=0.,
scale=1.,
shape=(10, ),
bcond='p',
coup=1.,
mix=.1,
mom=1.):
"""Define Anderson-Ising model with polarized impurity spins (spin-up)."""
# created 2013-07-12, modified 2014-01-27
# former tb._andis (developed 2012-09-10 - 2012-11-19)
# former tb._Andis (developed 2012-06-15 - 2012-06-19)
mix = misc.get_ratio(mix)
dim = len(shape)
scell = sc.SuperCell(dim=dim)
dist = sc.dist.select(dist)
scell.add_andisp(pot=dist(loc, scale),
hop=hop,
bcond=bcond,
shape=shape,
coup=coup,
mix=mix,
mom=mom)
pset = bundle.Bundle(dist=dist,
dim=dim,
loc=loc,
scale=scale,
shape=shape,
mix=mix,
coup=coup,
mom=mom,
hop=hop,
pot=loc)
return scell, pset
def heis(mix=0.1, range=1.0, coup=1.0, mom=1.0, shell=1, bcond="p", shape=(10,)):
"""Define homogeneous dilute Heisenberg model."""
# created 2013-07-12, modified 2013-07-18
# former tb._Heis (developed 2012-03-14 - 2012-09-06)
mix = misc.get_ratio(mix)
dim = len(shape)
scell = sc.SuperCell(dim=dim)
scell.add_heis(range=range, coup=coup, mix=mix, mom=mom, bcond=bcond, shape=shape, shell=shell)
pset = bundle.Bundle(dim=dim, shape=shape, mix=mix, coup=coup, mom=mom, shell=shell, range=range)
return scell, pset
def andisp(hop=-1.0, dist="uniform", loc=0.0, scale=1.0, shape=(10,), bcond="p", coup=1.0, mix=0.1, mom=1.0):
"""Define Anderson-Ising model with polarized impurity spins (spin-up)."""
# created 2013-07-12, modified 2014-01-27
# former tb._andis (developed 2012-09-10 - 2012-11-19)
# former tb._Andis (developed 2012-06-15 - 2012-06-19)
mix = misc.get_ratio(mix)
dim = len(shape)
scell = sc.SuperCell(dim=dim)
dist = sc.dist.select(dist)
scell.add_andisp(pot=dist(loc, scale), hop=hop, bcond=bcond, shape=shape, coup=coup, mix=mix, mom=mom)
pset = bundle.Bundle(
dist=dist, dim=dim, loc=loc, scale=scale, shape=shape, mix=mix, coup=coup, mom=mom, hop=hop, pot=loc
)
return scell, pset
def andheisp(hop=-1.0, dist="uniform", loc=0.0, scale=1.0, shape=(10,), bcond="p", coup=1.0, mix=0.1, mom=1.0):
"""Define Anderson-Heisenberg model with random impurity spins (somewhat
preferring the z-axis)."""
# created 2013-07-12, modified 2014-01-27
# former tb._andheis (developed 2012-09-10 - 2012-12-17)
# based on tb._andis from 2012-09-10
mix = misc.get_ratio(mix)
dim = len(shape)
scell = sc.SuperCell(dim=dim)
dist = sc.dist.select(dist)
scell.add_andheisp(pot=dist(loc, scale), hop=hop, bcond=bcond, shape=shape, coup=coup, mix=mix, mom=mom)
pset = bundle.Bundle(
dist=dist, dim=dim, loc=loc, scale=scale, shape=shape, mix=mix, coup=coup, mom=mom, hop=hop, pot=loc
)
return scell, pset
def heis(mix=.1, range=1., coup=1., mom=1., shell=1, bcond='p', shape=(10, )):
"""Define homogeneous dilute Heisenberg model."""
# created 2013-07-12, modified 2013-07-18
# former tb._Heis (developed 2012-03-14 - 2012-09-06)
mix = misc.get_ratio(mix)
dim = len(shape)
scell = sc.SuperCell(dim=dim)
scell.add_heis(range=range,
coup=coup,
mix=mix,
mom=mom,
bcond=bcond,
shape=shape,
shell=shell)
pset = bundle.Bundle(dim=dim,
shape=shape,
mix=mix,
coup=coup,
mom=mom,
shell=shell,
range=range)
return scell, pset
def andheis(hop=-1.,
dist='uniform',
loc=0.,
scale=1.,
shape=(10, ),
bcond='p',
coup=1.,
mix=.1,
mom=1.):
"""Define Anderson-Heisenberg model with isotropic random impurity spins
(conforming to the SU(2) group)."""
# created 2013-07-12, modified 2014-01-27
# former tb._andheisi (developed 2013-06-27 - 2013-06-27)
# based on tb._andheis (2012-09-10 - 2012-12-17)
# based on tb._andis from 2012-09-10
mix = misc.get_ratio(mix)
dim = len(shape)
scell = sc.SuperCell(dim=dim)
dist = sc.dist.select(dist)
scell.add_andheis(pot=dist(loc, scale),
hop=hop,
bcond=bcond,
shape=shape,
coup=coup,
mix=mix,
mom=mom)
pset = bundle.Bundle(dist=dist,
dim=dim,
loc=loc,
scale=scale,
shape=shape,
mix=mix,
coup=coup,
mom=mom,
hop=hop,
pot=loc)
return scell, pset