Can anyone help me why the conductance plot in the enclosed graphene code doesn't appear ?I just copied the codes from the tutorial. Thank you in advance.
Dear Dedi,
I believe your problem is rather related to the jupyter/ipython notebook. Do regular plots appear? What if you add a pyplot.show() to the cell?
Best, Anton
On Sun, Sep 27, 2015 at 12:17 PM, Dedi Setiabudidaya setiabudidaya@hotmail.com wrote:
Can anyone help me why the conductance plot in the enclosed graphene code doesn't appear ? I just copied the codes from the tutorial. Thank you in advance.
Dear Anton,Thank you for quick response; sorry, I mean the graph does appear but the conductance data are all zeros (see below). data = []energies = [-2 * pot + 4. / 50. * pot * i for i in xrange(51)]for energy in energies: smatrix = kwant.smatrix(sys, energy) data.append(smatrix.transmission(0, 1))print datapyplot.figure()pyplot.plot(energies, data)pyplot.xlabel("energy [t]")pyplot.ylabel("conductance [e^2/h]")pyplot.show() [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0] Best Regards, Dedi > From: anton.akhmerov@gmail.com
Date: Sun, 27 Sep 2015 13:38:35 +0200 Subject: Re: [Kwant] Conductance Plot doesn't appear To: setiabudidaya@hotmail.com CC: kwant-discuss@kwant-project.org
Dear Dedi,
I believe your problem is rather related to the jupyter/ipython notebook. Do regular plots appear? What if you add a pyplot.show() to the cell?
Best, Anton
On Sun, Sep 27, 2015 at 12:17 PM, Dedi Setiabudidaya setiabudidaya@hotmail.com wrote:
Can anyone help me why the conductance plot in the enclosed graphene code doesn't appear ? I just copied the codes from the tutorial. Thank you in advance.
Dear Dedi,
When I run your notebook I see that the bands of your leads go between energies of 1 and 7, however you calculate the transmission for energies between -0.2 and 0.2.
Thus, the reason that you see a transmission of 0 is because at the energies you have requested there are no open channels in the leads.
Hope that helps,
Joe
On 27 September 2015 at 15:41, Dedi Setiabudidaya <setiabudidaya@hotmail.com
wrote:
Dear Anton, Thank you for quick response; sorry, I mean the graph does appear but the conductance data are all zeros (see below).
data = [] energies = [-2 * pot + 4. / 50. * pot * i for i in xrange(51)] for energy in energies: smatrix = kwant.smatrix(sys, energy) data.append(smatrix.transmission(0, 1)) print data pyplot.figure() pyplot.plot(energies, data) pyplot.xlabel("energy [t]") pyplot.ylabel("conductance [e^2/h]") pyplot.show()
[0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
Best Regards,
Dedi
From: anton.akhmerov@gmail.com Date: Sun, 27 Sep 2015 13:38:35 +0200 Subject: Re: [Kwant] Conductance Plot doesn't appear To: setiabudidaya@hotmail.com CC: kwant-discuss@kwant-project.org
Dear Dedi,
I believe your problem is rather related to the jupyter/ipython notebook. Do regular plots appear? What if you add a pyplot.show() to the cell?
Best, Anton
On Sun, Sep 27, 2015 at 12:17 PM, Dedi Setiabudidaya setiabudidaya@hotmail.com wrote:
Can anyone help me why the conductance plot in the enclosed graphene
code
doesn't appear ? I just copied the codes from the tutorial. Thank you in advance.
Thank you very much Joe.
Date: Sun, 27 Sep 2015 17:41:22 +0200 Subject: Re: [Kwant] Conductance Plot doesn't appear From: joseph.weston08@gmail.com To: setiabudidaya@hotmail.com CC: anton.akhmerov@gmail.com; kwant-discuss@kwant-project.org
Dear Dedi,
When I run your notebook I see that the bands of your leads go between energies of 1 and 7, however you calculate the transmission for energies between -0.2 and 0.2.
Thus, the reason that you see a transmission of 0 is because at the energies you have requested there are no open channels in the leads.
Hope that helps,
Joe
On 27 September 2015 at 15:41, Dedi Setiabudidaya setiabudidaya@hotmail.com wrote:
Dear Anton,Thank you for quick response; sorry, I mean the graph does appear but the conductance data are all zeros (see below). data = []energies = [-2 * pot + 4. / 50. * pot * i for i in xrange(51)]for energy in energies: smatrix = kwant.smatrix(sys, energy) data.append(smatrix.transmission(0, 1))print datapyplot.figure()pyplot.plot(energies, data)pyplot.xlabel("energy [t]")pyplot.ylabel("conductance [e^2/h]")pyplot.show() [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0] Best Regards, Dedi > From: anton.akhmerov@gmail.com
Date: Sun, 27 Sep 2015 13:38:35 +0200 Subject: Re: [Kwant] Conductance Plot doesn't appear To: setiabudidaya@hotmail.com CC: kwant-discuss@kwant-project.org
Dear Dedi,
I believe your problem is rather related to the jupyter/ipython notebook. Do regular plots appear? What if you add a pyplot.show() to the cell?
Best, Anton
On Sun, Sep 27, 2015 at 12:17 PM, Dedi Setiabudidaya setiabudidaya@hotmail.com wrote:
Can anyone help me why the conductance plot in the enclosed graphene code doesn't appear ? I just copied the codes from the tutorial. Thank you in advance.
-
Anton Akhmerov -
Dedi Setiabudidaya -
Joseph Weston