mirror of https://github.com/phonopy/phonopy.git
SnO2 rutile example
This commit is contained in:
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bebd36077e
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48
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5
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0.0013409000 -0.0013409000 -0.0000245100
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17
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0.0044542600 -0.0021377000 0.0000000000
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0.0008937600 -0.0002200200 0.0000000000
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0.0271677900 0.0168139500 0.0164603400
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-0.0082202700 0.0048023900 0.0004453200
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0.0059788800 -0.0024592600 -0.0007979900
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-0.0035986100 -0.0014539300 -0.0003416100
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0.0271677900 0.0168139500 -0.0164603400
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-0.0082202700 0.0048023900 -0.0004453200
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0.0059788800 -0.0024592600 0.0007979900
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-0.0035986100 -0.0014539300 0.0003416100
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-0.1211486800 -0.0838031800 0.0000000000
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0.0055184500 0.0024577300 0.0000000000
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0.0004691500 0.0024502700 0.0000000000
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0.0030254700 0.0023254800 0.0000000000
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-0.0036746700 -0.0014125100 0.0000000000
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0.0010955200 0.0011017000 0.0013278100
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0.0108226900 -0.0008789500 -0.0088140900
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0.0013907700 0.0001653500 0.0016289000
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0.0014061800 -0.0011115300 -0.0000428300
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0.0109266200 -0.0068608700 -0.0077710600
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0.0108226900 -0.0008789500 0.0088140900
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0.0013907700 0.0001653500 -0.0016289000
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17
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0.0050576700 -0.0043770100 0.0000000000
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0.0016692100 0.0009178800 0.0000000000
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-0.0270063200 -0.0163467600 -0.0156957700
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0.0082319900 -0.0048287800 -0.0004488900
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-0.0059702300 0.0024650400 0.0008053500
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0.0035899600 0.0014692400 0.0003431900
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0.0082319900 -0.0048287800 0.0004488900
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0.0035899600 0.0014692400 -0.0003431900
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0.1254948000 0.0880965200 0.0000000000
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0.0028778700 0.0008906600 0.0000000000
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-0.0041821200 0.0004830600 0.0000000000
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-0.0001854500 0.0004696100 0.0000000000
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-0.0044328200 -0.0042232200 0.0000000000
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-0.0011191200 -0.0018180200 0.0000000000
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0.0008420200 -0.0001199900 0.0000000000
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-0.0045306700 -0.0047874000 0.0000000000
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0.0017449000 0.0024535100 0.0005782200
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0.0017481300 -0.0034960400 0.0037639800
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0.0017449000 0.0024535100 -0.0005782200
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-0.0044517100 0.0022548700 0.0013177200
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0.0017481300 -0.0034960400 -0.0037639800
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-0.0044514600 0.0035153900 -0.0000605700
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-0.0075940400 -0.0024900700 0.0089677200
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0.0019574600 -0.0035142700 -0.0016135500
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0.0019723400 -0.0022622500 0.0000460000
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-0.0074924100 0.0034640200 0.0076775400
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-0.0075940400 -0.0024900700 -0.0089677200
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0.0019574600 -0.0035142700 0.0016135500
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0.0019723400 -0.0022622500 -0.0000460000
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17
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0.0000000000000000 0.0000000000000000 0.0100000000000000
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0.0001032200 0.0001032200 0.0146856400
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0.0000083900 0.0000024000 0.0063357800
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0.0000360400 0.0000360400 -0.0086239500
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-0.0000089800 0.0000057000 -0.0070043800
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0.0000057000 -0.0000089800 -0.0070043800
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-0.0000080300 -0.0000080300 0.0000611900
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0.0193869500 0.0193869500 0.0421126500
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0.0032953000 -0.0029960200 -0.0001295800
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@ -0,0 +1,13 @@
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Sn O
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1.0
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4.8305952252843758 0.0000000000000000 0.0000000000000000
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0.0000000000000000 4.8305952252843758 0.0000000000000000
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0.0000000000000000 0.0000000000000000 3.2430828755363028
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2 4
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Direct
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0.0000000000000000 0.0000000000000000 0.0000000000000000
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0.5000000000000000 0.5000000000000000 0.5000000000000000
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0.3065372364588790 0.3065372364588790 0.0000000000000000
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0.6934627635411208 0.6934627635411208 0.0000000000000000
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0.1934627635411210 0.8065372364588792 0.5000000000000000
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0.8065372364588792 0.1934627635411210 0.5000000000000000
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@ -0,0 +1,28 @@
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SnO2 rutile structure.
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The space group type is P4_2/mnm (136). This is a non-symmorphic space group and a screw axis of c exists. Usually slope of phonon band normal to the Brillouin zone boundary becomes zero, but there are some positive and negative slopes are found at the Brilloun zone boundary due to the screw symmetry operation. This can be watched by
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% phonopy --dim="2 2 2" --band="0 0 0 0 0 1" -p
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where Z=(0, 0, 1/2). Non-zero slope indicates non-zero group velocity. But phonopy is usually not able to calculate these group velocity correctly. An example of wrongly calculated group velocity is shown as follows. We obtain the group velocity by
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% phonopy --dim="2 2 2" --band="0 0 0 0 0 1" --gv
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In band.yaml file, group velocity of band #7 and #8 at q=(0, 0, 0.5) are shown as
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- # 7
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frequency: 7.5390344506
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group_velocity: [ -0.0000000, 0.0000000, -16.7130708 ]
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- # 8
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frequency: 7.5390344506
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group_velocity: [ 0.0000000, -0.0000000, 16.7130708 ]
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But at the neighboring q-point of q=(0, 0, 0.52),
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- # 7
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frequency: 7.3428399771
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group_velocity: [ -0.0000000, 0.0000000, -32.1764347 ]
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- # 8
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frequency: 7.7304844141
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group_velocity: [ 0.0000000, -0.0000000, 30.6385174 ]
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This doesn't mean the group velocity suddenly changes between these neighboring q-points. The group velocity at q=(0, 0, 0.52) is correctly calcualted but not at q=(0, 0, 0.5). Therefore the group velocity close to q=(0, 0, 0.5) should be used instead of the value at q=(0, 0, 0.5) if we can accept this approximation.
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