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fan0221

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from ATK.TwoProbe import *

# Restore initial density from old calculation
zero_bias = restoreSelfConsistentCalculation("lih2li-scf.nc"

# Create a list of energies from -2 to 5 eV, with 0.1 eV spacing
import numpy
energy_list = numpy.arange(-2.0, 5.0, 0.1)*electronVolt

# Set k-points for transmission
bz_int_param = brillouinZoneIntegrationParameters( (1,1) )

# Calculate transmission spectrum
trans_spectrum = calculateTransmissionSpectrum(
    self_consistent_calculation = zero_bias,
    energies = energy_list,
    brillouin_zone_integration_parameters = bz_int_param
    )

vnlfile = VNLFile("lih2li_trans.vnl"
vnlfile.addToSample(trans_spectrum,'lih2li')
   
# Define conductance quantum
conductance_quantum = 7.748091733e-5*Siemens

# Calculate transmission spectrum at E_Fermi
fermi_trans = calculateTransmissionSpectrum(
    self_consistent_calculation = zero_bias,
    energies = [0.0]*electronVolt
    )
  
conductance = fermi_trans.coefficients()[0] * conductance_quantum
print 'Zero bias conductance: %.2e Siemens' % (conductance.inUnitsOf(Siemens))
¼´Ê¹ ÎÒÔÚ¼ÆËãµÄʱºòÊÇ atk trans.py > trans.dat
×îºóÒ²Ö»ÊÇÔÚdatÎļþÖиø³öÁË Zero bias conductance: 4.08e-005 Siemens
ÄÇôÈçºÎд¸ö¿ØÖÆÓï¾ä °ÑÊäÔËϵÊýÒ²Êä³öÄØ  Âé·³Ã÷°×µÄ´ïÈËÒÔÕâ¸öΪÀý×Ó°ïÎÒд¸ö¿ØÖÆÓï¾ä  Ð»Ð»

[ Last edited by fan0221 on 2008-12-26 at 21:16 ]
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atk bulk-calculateBands.py > si_fcc_gga.dat
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yuan888

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3Â¥2008-12-26 19:58:00
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TIGERYZZ

½ð³æ (СÓÐÃûÆø)

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# Print at screen the Transmission Spectrum
print 'Transmission Spectrum'
print '-----------------------------------------------------------------------'
print 'Energies(eV)  Coefficients'
for i in range(len(spectrum.energies())):
    print '%17.3f %17.6f' %(
                spectrum.energies().inUnitsOf(Units.eV),
                spectrum.coefficients())
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