Dear Chan, Yes indeed, kwant has a section about Spatially varying operators. If this doesn't work for you, you need to write what you want in a mathematical way, probably someone will see how to do it or give suggestions about it.
Regards, Adel On Mon, Jul 27, 2020 at 4:21 PM Prof. CHAN Kwok Sum <apksc...@cityu.edu.hk> wrote: > Dear Adel, > Thank you for your quick reply. My problem is not about calculating the > current in a specific region in the sample. I want to calculate a current > which has an operator depends on the direction of the bond. This is similar > to the spin current projected on a position-dependent spin-axis as in > section 2.7 in the manual. The position-dependent spin-axis depends on one > site only, according to my understanding. I would like to know if it is > possible to have position-dependent spin-axis depending on two sites of a > bond. > Regards > KS > > On 27 Jul 2020, at 8:47 PM, Abbout Adel <abbout.a...@gmail.com> wrote: > > Dear Chan, > > The current is calculated along a hopping for a kwant system. This means > that it is calculated on any couple of sites hop=(site1,site2). > > So if you provide a list of hoppings L=[(site1,site2), > (site3,site4),(site6, site73)], the kwant module will return the currents > for those hoppings. > > I hope this helps, > Adel > > On Mon, Jul 27, 2020 at 3:36 PM Prof. CHAN Kwok Sum <apksc...@cityu.edu.hk> > wrote: > >> Dear Kwant developer, >> I want to define a spatially varying current operator which depends on >> the two sites of a bond. Can this be done giving the “onsite” a function in >> the current operator definition. According to the manual, the function for >> onsite has the signature of a Hamiltonian on-site function, does it mean >> the function can only have one site as its input and cannot have two sites >> of a bond as input? If “onsite” cannot do the job, any suggestion of how to >> solve the problem? >> Regards, >> KS Chan >> >> >> Disclaimer: This email (including any attachments) is for the use of the >> intended recipient only and may contain confidential information and/or >> copyright material. If you are not the intended recipient, please notify >> the sender immediately and delete this email and all copies from your >> system. Any unauthorized use, disclosure, reproduction, copying, >> distribution, or other form of unauthorized dissemination of the contents >> is expressly prohibited. >> > > > -- > Abbout Adel > > > -- Abbout Adel
