Dear Kwant users, I am trying to obtain the local density of states of a topological (finite) system by using KPM approximation. My problem is that the gap is too small (as I am considering realistic parameters) and this results in more states than the topologically protected ones appearing for zero energy LDoS. If I control the energy resolution the memory consumption increases too much. So my question is if there is any parameter I can control to have a better energy resolution only near zero energy or maybe somewhere I can compensate the memory consumption (for example, losing resolution at the local distribution in order to obtain better energy resolution). Thanks in advance. -- Antônio Lucas Rigotti Manesco PhD fellow - University of São Paulo, Brazil
Dear Antonio, KPM by itself doesn't allow to adjust the resolution locally. If you need detailed information about a small part of the spectrum, sparse diagonalization is a more appropriate tool. Best, Anton On Tue, Nov 28, 2017 at 1:58 PM, Antonio Lucas Rigotti Manesco <antoniolrm@usp.br> wrote:
Dear Kwant users,
I am trying to obtain the local density of states of a topological (finite) system by using KPM approximation. My problem is that the gap is too small (as I am considering realistic parameters) and this results in more states than the topologically protected ones appearing for zero energy LDoS. If I control the energy resolution the memory consumption increases too much.
So my question is if there is any parameter I can control to have a better energy resolution only near zero energy or maybe somewhere I can compensate the memory consumption (for example, losing resolution at the local distribution in order to obtain better energy resolution).
Thanks in advance. -- Antônio Lucas Rigotti Manesco PhD fellow - University of São Paulo, Brazil
Dear Anton, Thanks for your response. I will do that. Best, 2017-11-28 11:01 GMT-02:00 Anton Akhmerov <anton.akhmerov+kd@gmail.com>:
Dear Antonio,
KPM by itself doesn't allow to adjust the resolution locally. If you need detailed information about a small part of the spectrum, sparse diagonalization is a more appropriate tool.
Best, Anton
On Tue, Nov 28, 2017 at 1:58 PM, Antonio Lucas Rigotti Manesco <antoniolrm@usp.br> wrote:
Dear Kwant users,
I am trying to obtain the local density of states of a topological (finite) system by using KPM approximation. My problem is that the gap is too small (as I am considering realistic parameters) and this results in more states than the topologically protected ones appearing for zero energy LDoS. If I control the energy resolution the memory consumption increases too much.
So my question is if there is any parameter I can control to have a better energy resolution only near zero energy or maybe somewhere I can compensate the memory consumption (for example, losing resolution at the local distribution in order to obtain better energy resolution).
Thanks in advance. -- Antônio Lucas Rigotti Manesco PhD fellow - University of São Paulo, Brazil
-- Antônio Lucas Rigotti Manesco PhD fellow - University of São Paulo, Brazil
participants (2)
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Anton Akhmerov -
Antonio Lucas Rigotti Manesco