def __init__(self,t,U=0,occ=True):
self.t,self.U=t,U
self.occ=occ
#occupation representation will use <SuperSpaceConfig>, otherwise <SpaceConfig>.
if self.occ:
spaceconfig=SuperSpaceConfig([1,2,6,1])
else:
spaceconfig=SpaceConfig([1,2,6,1],kspace=False)
if abs(U)>0: warnings.warn('U is ignored in non-occupation representation.')
hgen=RHGenerator(spaceconfig=spaceconfig)
#define the operator of the system
hgen.register_params({
't1':self.t,
'U':self.U,
})
#define a structure and initialize bonds.
rlattice=Structure(sites=[(0.,0),(0,sqrt(3.)/3),(0.5,sqrt(3.)/2),(0.5,-sqrt(3.)/6),(1.,0),(1.,sqrt(3.)/3)])
hgen.uselattice(rlattice)
b1s=rlattice.getbonds(1) #the nearest neighbor
#add the hopping term.
op_t1=op_simple_hopping(label='hop1',spaceconfig=spaceconfig,bonds=b1s)
hgen.register_operator(op_t1,param='t1')
#add the hubbard interaction term if it is in the occupation number representation.
if self.occ:
op_ninj=op_U(label='ninj',spaceconfig=spaceconfig)
hgen.register_operator(op_ninj,param='U')
self.hgen=hgen
def __init__(self, t, t2=0, U=0, mu=0., occ=True, nsite=6):
self.t, self.t2, self.U, self.mu = t, t2, U, mu
self.occ = occ
self.nsite = nsite
#occupation representation will use <SuperSpaceConfig>, otherwise <SpaceConfig>.
if self.occ:
spaceconfig = SuperSpaceConfig(chorder([nsite, 2, 1]))
else:
spaceconfig = SpaceConfig(chorder([1, 2, nsite, 1]), kspace=False)
if abs(U) > 0:
warnings.warn('U is ignored in non-occupation representation.')
hgen = RHGenerator(spaceconfig=spaceconfig)
#define the operator of the system
hgen.register_params({
't1': self.t,
't2': self.t2,
'U': self.U,
'-mu': -self.mu,
})
#define a structure and initialize bonds.
rlattice = Chain(N=nsite)
hgen.uselattice(rlattice)
b1s = rlattice.getbonds(1) #the nearest neighbor
b2s = rlattice.getbonds(2) #the nearest neighbor
#add the hopping term.
op_t1 = op_simple_hopping(label='hop1',
spaceconfig=spaceconfig,
bonds=b1s)
hgen.register_operator(op_t1, param='t1')
op_t2 = op_simple_hopping(label='hop2',
spaceconfig=spaceconfig,
bonds=b2s)
hgen.register_operator(op_t2, param='t2')
op_n = op_simple_onsite(label='n', spaceconfig=spaceconfig)
hgen.register_operator(op_n, param='-mu')
#add the hubbard interaction term if it is in the occupation number representation.
if self.occ:
op_ninj = op_U(label='ninj', spaceconfig=spaceconfig)
hgen.register_operator(op_ninj, param='U')
self.hgen = hgen
def __init__(self,t,t2=0,U=0,mu=0.,occ=True,nsite=6):
self.t,self.t2,self.U,self.mu=t,t2,U,mu
self.occ=occ
self.nsite=nsite
#occupation representation will use <SuperSpaceConfig>, otherwise <SpaceConfig>.
if self.occ:
spaceconfig=SuperSpaceConfig([1,2,nsite,1])
else:
spaceconfig=SpaceConfig([1,2,nsite,1],kspace=False)
if abs(U)>0: warnings.warn('U is ignored in non-occupation representation.')
hgen=RHGenerator(spaceconfig=spaceconfig)
#define the operator of the system
hgen.register_params({
't1':self.t,
't2':self.t2,
'U':self.U,
'-mu':-self.mu,
})
#define a structure and initialize bonds.
rlattice=Chain(N=nsite)
hgen.uselattice(rlattice)
b1s=rlattice.getbonds(1) #the nearest neighbor
b2s=rlattice.getbonds(2) #the nearest neighbor
#add the hopping term.
op_t1=op_simple_hopping(label='hop1',spaceconfig=spaceconfig,bonds=b1s)
hgen.register_operator(op_t1,param='t1')
op_t2=op_simple_hopping(label='hop2',spaceconfig=spaceconfig,bonds=b2s)
hgen.register_operator(op_t2,param='t2')
op_n=op_simple_onsite(label='n',spaceconfig=spaceconfig)
hgen.register_operator(op_n,param='-mu')
#add the hubbard interaction term if it is in the occupation number representation.
if self.occ:
op_ninj=op_U(label='ninj',spaceconfig=spaceconfig)
hgen.register_operator(op_ninj,param='U')
self.hgen=hgen
def __init__(self,t,mu,K1,K2,nsite,U=0.,periodic=False,use_sx=True):
self.t,self.mu,self.K1,self.K2,self.U=t,mu,K1,K2,U
self.nsite=nsite
self.periodic=periodic
self.use_sx=use_sx
spaceconfig=SuperSpaceConfig(chorder([1,2,self.nsite,1]))
hgen=RHGenerator(spaceconfig=spaceconfig)
#define the operator of the system
hgen.register_params({
'-t':-self.t,
'K1':self.K1,
'K2':self.K2,
'-mu':-self.mu,
'U':self.U
})
#define a structure and initialize bonds.
rlattice=Chain(N=nsite)
if periodic:
rlattice.usegroup(TranslationGroup(rlattice.N[:,newaxis]*rlattice.a,per=ones(1,dtype='bool')))
hgen.uselattice(rlattice)
b1s=rlattice.getbonds(1) #the nearest neighbor
#add the hopping term.
op_t1=op_simple_hopping(label='hop1',spaceconfig=spaceconfig,bonds=b1s)
hgen.register_operator(op_t1,param='-t')
op_n=op_simple_onsite(label='n',spaceconfig=spaceconfig)
hgen.register_operator(op_n,param='-mu')
op_nn=op_U(spaceconfig=spaceconfig)
hgen.register_operator(op_nn,param='U')
#add the interaction term
ql1=[]
op_K1=sum([Qlinear(indices=array([
spaceconfig.c2ind(chorder([0,i%nsite,0])), #spin, atom orbit
spaceconfig.c2ind(chorder([1,i%nsite,0])), #spin, atom orbit
spaceconfig.c2ind(chorder([1,(i+1)%nsite,0])), #spin, atom orbit
spaceconfig.c2ind(chorder([0,(i+1)%nsite,0]))]),spaceconfig=spaceconfig) #spin, atom orbit
for i in xrange(nsite if periodic else nsite-1)])
op_K1=op_K1+op_K1.HC
op_K1.label='K1'
hgen.register_operator(op_K1,param='K1')
op_K2=sum([Qlinear(indices=array([
spaceconfig.c2ind(chorder([0,i%nsite,0])), #spin, atom orbit
spaceconfig.c2ind(chorder([0,(i+1)%nsite,0])), #spin, atom orbit
spaceconfig.c2ind(chorder([1,(i+1)%nsite,0])), #spin, atom orbit
spaceconfig.c2ind(chorder([1,i%nsite,0]))]),spaceconfig=spaceconfig) #spin, atom orbit
for i in xrange(nsite if periodic else nsite-1)])
op_K2=op_K2+op_K2.HC
if self.use_sx:
op_K2+=sum([Qlinear(indices=array([
spaceconfig.c2ind(chorder([0,i%nsite,0])), #spin, atom orbit
spaceconfig.c2ind(chorder([1,(i+1)%nsite,0])), #spin, atom orbit
spaceconfig.c2ind(chorder([0,(i+1)%nsite,0])), #spin, atom orbit
spaceconfig.c2ind(chorder([1,i%nsite,0]))]),spaceconfig=spaceconfig) #spin, atom orbit
for i in xrange(nsite if periodic else nsite-1)])
op_K2+=sum([Qlinear(indices=array([
spaceconfig.c2ind(chorder([1,i%nsite,0])), #spin, atom orbit
spaceconfig.c2ind(chorder([0,(i+1)%nsite,0])), #spin, atom orbit
spaceconfig.c2ind(chorder([1,(i+1)%nsite,0])), #spin, atom orbit
spaceconfig.c2ind(chorder([0,i%nsite,0]))]),spaceconfig=spaceconfig) #spin, atom orbit
for i in xrange(nsite if periodic else nsite-1)])
op_K2.label='K2'
hgen.register_operator(op_K2,param='K2')
self.hgen=hgen
self.qnumber='QR' if K2!=0 else 'QM'
def __init__(self,t,mu,alpha,U,Delta,Vz,nsite,periodic=False,occ=False,kspace=True,resonance=False):
if kspace and not periodic:
raise ValueError('Don\'t be silly, how can you use kspace with non-periodic system!')
if kspace and occ:
raise ValueError('Don\'t be silly, how can you use kspace with occupation representation!')
if kspace and resonance:
raise ValueError('Don\'t be silly, how can you use kspace to study resonance!')
self.t,self.mu,self.alpha,self.U,self.Delta,self.Vz=t,mu,alpha,U,Delta,Vz
self.nsite=nsite
self.periodic=periodic
self.resonance=resonance
self.occ=occ
nambu=abs(self.Delta)>0 and not occ
#nambu=True
nnambu=2 if nambu else 1
junction_site=nsite/2
if occ:
spaceconfig=SuperSpaceConfig(chorder([1,2,self.nsite,1]))
hgen=RHGenerator(spaceconfig=spaceconfig)
elif kspace:
spaceconfig=SpaceConfig(chorder([nnambu,2,1,1]),kspace=True)
hgen=KHGenerator(spaceconfig=spaceconfig,propergauge=False)
else:
spaceconfig=SpaceConfig(chorder([nnambu,2,self.nsite,1]))
hgen=RHGenerator(spaceconfig=spaceconfig)
#define the operator of the system
hgen.register_params({
'-t/2':-self.t/2.,
'-alpha/2':-self.alpha/2.,
'U':self.U,
'Vz':self.Vz,
'-mu+t':-self.mu+self.t,
'Delta':self.Delta,
't':self.t,
})
#define a structure and initialize bonds.
rlattice=Chain(N=nsite)
if periodic:
rlattice.usegroup(TranslationGroup(rlattice.N[:,newaxis]*rlattice.a,per=ones(1,dtype='bool')))
hgen.uselattice(rlattice)
b1s=rlattice.cbonds[1] if kspace else rlattice.getbonds(1) #the nearest neighbor
b0s=rlattice.cbonds[0] if kspace else rlattice.getbonds(0) #the onsite bonds.
brs=[b for b in b0s if b.atom1>=junction_site]
bls=[b for b in b0s if b.atom1<junction_site]
#add the hopping term and chemical potential.
t0=time.time()
op_t1=op_simple_hopping(label='hop1',spaceconfig=spaceconfig,bonds=b1s)
hgen.register_operator(op_t1,param='-t/2')
t1=time.time()
if resonance:
op_n=op_on_bond(label='n',spaceconfig=spaceconfig,bonds=brs,mats=[kron(sz,identity(2))]*len(brs))
hgen.register_operator(op_n,param='t')
op_nl=op_on_bond(label='nl',spaceconfig=spaceconfig,bonds=bls,mats=[kron(sz,identity(2))]*len(bls))
hgen.register_operator(op_nl,param='-mu+t')
else:
op_n=op_simple_onsite(label='n',spaceconfig=spaceconfig)
hgen.register_operator(op_n,param='-mu+t')
t2=time.time()
#the rashba term
rmats=[1j*(sy if not nambu else kron(sz,sy))*(1 if b.bondv[0]>0 else -1) for b in b1s]
op_r=op_on_bond(label='rashba',spaceconfig=spaceconfig,bonds=b1s,mats=rmats)
hgen.register_operator(op_r,param='-alpha/2')
t3=time.time()
#the magnetic field
op_Vz=op_on_bond(label='Sz',spaceconfig=spaceconfig,bonds=b0s,mats=[sz if not nambu else kron(sz,sz)]*len(b0s))
hgen.register_operator(op_Vz,param='Vz')
t4=time.time()
if abs(Delta)>0:
#the cooper pairing term, if the resonace mode, only the left side is added.
if nambu:
if resonance:
op_D=op_on_bond(label='D',spaceconfig=spaceconfig,bonds=bls,mats=[-kron(sy,sy)]*len(bls))
else:
op_D=op_on_bond(label='D',spaceconfig=spaceconfig,bonds=b0s,mats=[-kron(sy,sy)]*len(b0s))
else:
op_D=op_supercooper(label='D',spaceconfig=spaceconfig,bonds=b0s,mats=[array([[0,1],[0,0]])]*len(b0s))
hgen.register_operator(op_D,param='Delta')
if occ:
#add the interaction term
op_ninj=op_U(label='ninj',spaceconfig=spaceconfig)
hgen.register_operator(op_ninj,param='U')
t5=time.time()
print 'Elapse -> t: %s, n: %s, r: %s, B: %s, D: %s'%(t1-t0,t2-t1,t3-t2,t4-t3,t5-t4)
self.hgen=hgen
def get_interaction(self):
'''
Get the interaction operator.
'''
return self.U*op_U(self.spaceconfig)
