.. DO NOT EDIT. .. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY. .. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE: .. "auto_examples/plot_gr_deflector_scan.py" .. LINE NUMBERS ARE GIVEN BELOW. .. only:: html .. note:: :class: sphx-glr-download-link-note :ref:`Go to the end ` to download the full example code .. rst-class:: sphx-glr-example-title .. _sphx_glr_auto_examples_plot_gr_deflector_scan.py: Graphene deflector scan =============================== Simple workflow for analyzing a deflector scan data of graphene as simulated from a third nearest neighbor tight binding model. The same workflow can be applied to any tilt-, polar- or deflector-scan. .. GENERATED FROM PYTHON SOURCE LINES 12-13 Import the "fundamental" python libraries for a generic data analysis: .. GENERATED FROM PYTHON SOURCE LINES 13-17 .. code-block:: default import numpy as np import matplotlib.pyplot as plt .. GENERATED FROM PYTHON SOURCE LINES 18-19 Instead of loading the file as for example: .. GENERATED FROM PYTHON SOURCE LINES 19-24 .. code-block:: default # from navarp.utils import navfile # file_name = r"nxarpes_simulated_cone.nxs" # entry = navfile.load(file_name) .. GENERATED FROM PYTHON SOURCE LINES 25-27 Here we build the simulated graphene signal with a dedicated function defined just for this purpose: .. GENERATED FROM PYTHON SOURCE LINES 27-38 .. code-block:: default from navarp.extras.simulation import get_tbgraphene_deflector entry = get_tbgraphene_deflector( scans=np.linspace(-5., 5., 51), angles=np.linspace(-7, 7, 300), ebins=np.linspace(-3.3, 0.4, 450), tht_an=-18, phi_an=0, hv=120 ) .. GENERATED FROM PYTHON SOURCE LINES 39-43 Plot a single analyzer image at scan = 0 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ First I have to extract the isoscan from the entry, so I use the isoscan method of entry: .. GENERATED FROM PYTHON SOURCE LINES 43-45 .. code-block:: default iso0 = entry.isoscan(scan=0, dscan=0) .. GENERATED FROM PYTHON SOURCE LINES 46-47 Then to plot it using the 'show' method of the extracted iso0: .. GENERATED FROM PYTHON SOURCE LINES 47-49 .. code-block:: default iso0.show(yname='ekin') .. image-sg:: /auto_examples/images/sphx_glr_plot_gr_deflector_scan_001.png :alt: plot gr deflector scan :srcset: /auto_examples/images/sphx_glr_plot_gr_deflector_scan_001.png :class: sphx-glr-single-img .. rst-class:: sphx-glr-script-out .. code-block:: none .. GENERATED FROM PYTHON SOURCE LINES 50-51 Or by string concatenation, directly as: .. GENERATED FROM PYTHON SOURCE LINES 51-53 .. code-block:: default entry.isoscan(scan=0, dscan=0).show(yname='ekin') .. image-sg:: /auto_examples/images/sphx_glr_plot_gr_deflector_scan_002.png :alt: plot gr deflector scan :srcset: /auto_examples/images/sphx_glr_plot_gr_deflector_scan_002.png :class: sphx-glr-single-img .. rst-class:: sphx-glr-script-out .. code-block:: none .. GENERATED FROM PYTHON SOURCE LINES 54-59 Fermi level determination ^^^^^^^^^^^^^^^^^^^^^^^^^ The initial guess for the binding energy is: ebins = ekins - (hv - work_fun). However, the better way is to proper set the Fermi level first and then derives everything form it. The Fermi level can be given directly as a value using: .. GENERATED FROM PYTHON SOURCE LINES 59-62 .. code-block:: default entry.set_efermi(114.8) .. GENERATED FROM PYTHON SOURCE LINES 63-67 Or it can be detected from a fit using the method autoset_efermi. In both cases the binding energy and the photon energy will be updated consistently. Note that the work function depends on the beamline or laboratory. If not specified is 4.5 eV. .. GENERATED FROM PYTHON SOURCE LINES 67-74 .. code-block:: default entry.autoset_efermi(scan_range=[-5, 5], energy_range=[115.2, 115.8]) print("Energy of the Fermi level = {:.0f} eV".format(entry.efermi)) print("Energy resolution = {:.0f} meV".format(entry.efermi_fwhm*1000)) entry.plt_efermi_fit() .. image-sg:: /auto_examples/images/sphx_glr_plot_gr_deflector_scan_003.png :alt: plot gr deflector scan :srcset: /auto_examples/images/sphx_glr_plot_gr_deflector_scan_003.png :class: sphx-glr-single-img .. rst-class:: sphx-glr-script-out .. code-block:: none Fermi level at 115.4016 eV Energy resolution = 56.5 meV (i.e. FWHM of the Gaussian shape which, convoluted with a step function, fits the Fermi edge) Photon energy is now set to 120.0016 eV (instead of 120.0000 eV) Energy of the Fermi level = 115 eV Energy resolution = 57 meV .. GENERATED FROM PYTHON SOURCE LINES 75-77 Plot a single analyzer image at scan = 0 with the Fermi level aligned ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ .. GENERATED FROM PYTHON SOURCE LINES 77-80 .. code-block:: default entry.isoscan(scan=0, dscan=0).show(yname='eef') .. image-sg:: /auto_examples/images/sphx_glr_plot_gr_deflector_scan_004.png :alt: plot gr deflector scan :srcset: /auto_examples/images/sphx_glr_plot_gr_deflector_scan_004.png :class: sphx-glr-single-img .. rst-class:: sphx-glr-script-out .. code-block:: none .. GENERATED FROM PYTHON SOURCE LINES 81-83 Plotting iso-energetic cut at ekin = efermi ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ .. GENERATED FROM PYTHON SOURCE LINES 83-86 .. code-block:: default entry.isoenergy(0).show() .. image-sg:: /auto_examples/images/sphx_glr_plot_gr_deflector_scan_005.png :alt: plot gr deflector scan :srcset: /auto_examples/images/sphx_glr_plot_gr_deflector_scan_005.png :class: sphx-glr-single-img .. rst-class:: sphx-glr-script-out .. code-block:: none .. GENERATED FROM PYTHON SOURCE LINES 87-94 Plotting in the reciprocal space (k-space) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ I have to define first the reference point to be used for the transformation. Meaning a point in the angular space which I know it correspond to a particular point in the k-space. In this case the graphene Dirac-point which is at ekin = 114.3 eV, in angle is at (tht_p, phi_p) = (0.1, 0) and in the k-space has to correspond to (kx, ky) = (1.7, 0). .. GENERATED FROM PYTHON SOURCE LINES 94-103 .. code-block:: default entry.set_kspace( tht_p=0.1, k_along_slit_p=1.7, scan_p=0, ks_p=0, e_kin_p=114.3, ) .. rst-class:: sphx-glr-script-out .. code-block:: none tht_an = -17.979 scan_type = deflector inn_pot = 14.000 scans_0 = 0.000 phi_an = 0.000 kspace transformation ready .. GENERATED FROM PYTHON SOURCE LINES 104-106 Once it is set, all the isoscan or isoenergy extracted from the entry will now get their proper k-space scales: .. GENERATED FROM PYTHON SOURCE LINES 106-109 .. code-block:: default entry.isoscan(0).show() .. image-sg:: /auto_examples/images/sphx_glr_plot_gr_deflector_scan_006.png :alt: plot gr deflector scan :srcset: /auto_examples/images/sphx_glr_plot_gr_deflector_scan_006.png :class: sphx-glr-single-img .. rst-class:: sphx-glr-script-out .. code-block:: none .. GENERATED FROM PYTHON SOURCE LINES 110-115 .. code-block:: default # sphinx_gallery_thumbnail_number = 7 entry.isoenergy(0).show() .. image-sg:: /auto_examples/images/sphx_glr_plot_gr_deflector_scan_007.png :alt: plot gr deflector scan :srcset: /auto_examples/images/sphx_glr_plot_gr_deflector_scan_007.png :class: sphx-glr-single-img .. rst-class:: sphx-glr-script-out .. code-block:: none .. GENERATED FROM PYTHON SOURCE LINES 116-117 I can also place together in a single figure different images: .. GENERATED FROM PYTHON SOURCE LINES 117-126 .. code-block:: default fig, axs = plt.subplots(1, 2) entry.isoscan(0).show(ax=axs[0]) entry.isoenergy(0).show(ax=axs[1]) plt.tight_layout() .. image-sg:: /auto_examples/images/sphx_glr_plot_gr_deflector_scan_008.png :alt: plot gr deflector scan :srcset: /auto_examples/images/sphx_glr_plot_gr_deflector_scan_008.png :class: sphx-glr-single-img .. GENERATED FROM PYTHON SOURCE LINES 127-131 For the isoenergy case, I can also rotate the image around its origin. Which can be useful sometime if the sample was not exactly aligned during the data acquisition. Or if you are a fun on what I consider as a very bad practice, you can repeat the same image at each symmetric point. .. GENERATED FROM PYTHON SOURCE LINES 131-159 .. code-block:: default fig, axs = plt.subplots(2, 2, constrained_layout=True) ax = axs[0][0] entry.isoenergy(0).show(ax=ax) ax.set_title('No rotation'.format()) rot_ang = 30 ax = axs[0][1] ax.set_title('Rotation of {} degrees'.format(rot_ang)) entry.isoenergy(0).show(ax=ax, rotate=rot_ang) rot_ang = 90 ax = axs[1][0] ax.set_title('Rotation of {} degrees'.format(rot_ang)) entry.isoenergy(0).show(ax=ax, rotate=rot_ang) rot_angs = [0, 60, 120, 180, 240, 300] ax = axs[1][1] ax.set_title('Repetition at every 60 degrees') isoen_fs = entry.isoenergy(0) for rot_ang in rot_angs: isoen_fs.show(ax=ax, rotate=rot_ang) for ax in axs.ravel(): ax.set_aspect('equal') .. image-sg:: /auto_examples/images/sphx_glr_plot_gr_deflector_scan_009.png :alt: No rotation, Rotation of 30 degrees, Rotation of 90 degrees, Repetition at every 60 degrees :srcset: /auto_examples/images/sphx_glr_plot_gr_deflector_scan_009.png :class: sphx-glr-single-img .. GENERATED FROM PYTHON SOURCE LINES 160-162 Many other options: ^^^^^^^^^^^^^^^^^^^ .. GENERATED FROM PYTHON SOURCE LINES 162-212 .. code-block:: default fig, axs = plt.subplots(2, 2) scan = 0.8 dscan = 0.05 ebin = -0.4 debin = 0.05 entry.isoscan(scan, dscan).show(ax=axs[0][0], xname='tht', yname='ekin') entry.isoscan(scan, dscan).show(ax=axs[0][1], cmap='binary') axs[0][0].axhline(ebin-debin+entry.efermi) axs[0][0].axhline(ebin+debin+entry.efermi) axs[0][1].axhline(ebin-debin) axs[0][1].axhline(ebin+debin) entry.isoenergy(ebin, debin).show( ax=axs[1][0], xname='tht', yname='phi', cmap='cividis') entry.isoenergy(ebin, debin).show( ax=axs[1][1], cmap='magma', cmapscale='log') axs[1][0].axhline(scan, color='w') x_note = 0.05 y_note = 0.98 for ax in axs[0][:]: ax.annotate( "$scan \: = \: {} \pm {} \; ^\circ$".format(scan, dscan), (x_note, y_note), xycoords='axes fraction', size=8, rotation=0, ha="left", va="top", bbox=dict( boxstyle="round", fc='w', alpha=0.65, edgecolor='None', pad=0.05 ) ) for ax in axs[1][:]: ax.annotate( "$E-E_F \: = \: {} \pm {} \; eV$".format(ebin, debin), (x_note, y_note), xycoords='axes fraction', size=8, rotation=0, ha="left", va="top", bbox=dict( boxstyle="round", fc='w', alpha=0.65, edgecolor='None', pad=0.05 ) ) plt.tight_layout() .. image-sg:: /auto_examples/images/sphx_glr_plot_gr_deflector_scan_010.png :alt: plot gr deflector scan :srcset: /auto_examples/images/sphx_glr_plot_gr_deflector_scan_010.png :class: sphx-glr-single-img .. rst-class:: sphx-glr-timing **Total running time of the script:** (0 minutes 3.450 seconds) .. _sphx_glr_download_auto_examples_plot_gr_deflector_scan.py: .. only:: html .. container:: sphx-glr-footer sphx-glr-footer-example .. container:: sphx-glr-download sphx-glr-download-python :download:`Download Python source code: plot_gr_deflector_scan.py ` .. container:: sphx-glr-download sphx-glr-download-jupyter :download:`Download Jupyter notebook: plot_gr_deflector_scan.ipynb ` .. only:: html .. rst-class:: sphx-glr-signature `Gallery generated by Sphinx-Gallery `_