def test_asymptotic_shell_localization():
a = Material(1.0, 0.0, 1.0, 1.0, 1.0)
b = Material(1.0, -0.5, 1.0, 1.0, 1.0) # Lower band edges.
csnc1 = CoreShellParticle(a, b, 1.0, 1.0) # Type 2 CSNC. h/e structure.
csnc2 = CoreShellParticle(b, a, 1.0, 1.0) # Type 2 CSNC. e/h structure.
assert np.isclose(
csnc1.localization_electron_shell(1e6),
csnc1.localization_electron_shell(asymp=True),
)
assert np.isclose(csnc2.localization_hole_shell(1e6),
csnc2.localization_hole_shell(asymp=True))
def test_thicker_core_requires_smaller_shell_for_localization_eh():
"""Tests that a thicker core leads to carrier confinement in a thinner shell, in type-2 e/h CSNCs.
"""
a = Material(1.0, 0.0, 1.0, 1.0, 1.0)
b = Material(1.0, -0.5, 1.0, 1.0, 1.0) # Lower band edges.
csnc1 = CoreShellParticle(b, a, 1.0, 1.0) # Type 2 CSNC. e/h structure.
csnc2 = CoreShellParticle(b, a, 1.1, 1.0) # Type 2 CSNC. e/h structure.
csnc1_shellloc = csnc1.localization_hole_shell()
csnc2_shellloc = csnc2.localization_hole_shell()
assert csnc2_shellloc < csnc1_shellloc
# plt.gcf().set_size_inches(10, 8)
# ax.set_xlabel('Core radius [nm]')
# ax.set_ylabel('Shell width [nm]')
# ax.set_zlabel('$\Theta$')
# plt.show()
# =====================================================================
def localization_in_core_eh(shell_width):
return cseh.localization_electron_core(shell_width)
def localization_in_shell_eh(core_width):
return cseh.localization_hole_shell(core_width)
vec_localization_in_core_eh = np.vectorize(localization_in_core_eh)
vec_localization_in_shell_eh = np.vectorize(localization_in_shell_eh)
# =====================================================================
core_radii_for_image = np.linspace(0.5, 4, 20)
shell_radii_for_image = np.linspace(0.2, 2, 20)
shell_radii_for_localization = vec_localization_in_shell_eh(
core_radii_for_image)
shell_radii_asymptote = cseh.localization_hole_shell(asymp=True)
core_radii_for_localization = vec_localization_in_core_eh(
shell_radii_for_image)
core_radii_asymptote = cseh.localization_electron_core(asymp=True)
# plt.plot(core_radii_for_image, shell_radii_for_localization, core_radii_for_localization, shell_radii_for_image)
# plt.xlim(0.5, 4)
# plt.ylim(0.2, 2)
# plt.show()