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Structure info
Layer group p-3m1
Layer group number 72
Structure origin original03-18
Stability
Energy above convex hull [eV/atom] 0.220
Heat of formation [eV/atom] 0.153
Dynamically stable Yes
Basic properties
Magnetic No
Band gap (PBE) [eV] 0.000
XYZ CIF JSON
Axis x [Å] y [Å] z [Å] Periodic
1 4.322 -0.000 0.000 Yes
2 -2.161 3.758 0.000 Yes
3 0.000 0.000 18.856 No
Lengths [Å] 4.322 4.335 18.856
Angles [°] 90.000 90.000 119.896

Symmetries
2D Bravais type Hexagonal (hp)
Layer group number 72
Layer group p-3m1
Space group number (bulk in AA-stacking) 164
Space group (bulk in AA-stacking) P-3m1
Point group -3m
Inversion symmetry Yes
Structure data
Formula Ag2Se2
Stoichiometry AB
Number of atoms 4
Unit cell area [Å2] 16.242
Thickness [Å] 3.379

Ag2Se2 (2AgSe-4)
Heat of formation [eV/atom] 0.15
Energy above convex hull [eV/atom] 0.22
Monolayers from C2DB
Se2Ag4 (2SeAg2-1) -0.09 eV/atom
Se8Ag16 (8SeAg2-1) -0.07 eV/atom
Ag4Se4 (4AgSe-1) -0.02 eV/atom
Ag2Se2 (2AgSe-1) 0.02 eV/atom
Ag8Se12 (4Ag2Se3-1) 0.03 eV/atom
Ag2Se4 (2AgSe2-1) 0.05 eV/atom
Ag2Se2 (2AgSe-2) 0.05 eV/atom
Ag2Se2 (2AgSe-3) 0.06 eV/atom
AgSe2 (1AgSe2-1) 0.11 eV/atom
SeAg2 (1SeAg2-1) 0.15 eV/atom
Ag2Se2, (2AgSe-4) 0.15 eV/atom
Ag2Se2 (2AgSe-5) 0.18 eV/atom
Ag2Se4 (2AgSe2-2) 0.19 eV/atom
Se2 (2Se-1) 0.21 eV/atom
AgSe2 (1AgSe2-2) 0.22 eV/atom
Ag2Se2 (2AgSe-6) 0.27 eV/atom
Se2 (2Se-2) 0.29 eV/atom
Ag2 (2Ag-1) 0.31 eV/atom
AgSe2 (1AgSe2-3) 0.32 eV/atom
Bulk crystals from OQMD123
Ag8Se4 -0.07 eV/atom
Ag4 0.00 eV/atom
Se3 0.00 eV/atom

AB/2AgSe/4/phonon_bs.png
Minimum eigenvalue of Hessian [eV/Ų] -0.00

Cij (N/m) xx yy xy
xx 20.39 11.23 -0.07
yy 11.01 21.67 0.03
xy 0.11 -0.03 7.20
Stiffness tensor eigenvalues
Eigenvalue 0 7.20 N/m
Eigenvalue 1 9.89 N/m
Eigenvalue 2 32.17 N/m

Key values [eV]
Band gap (PBE) 0.000
Direct band gap (PBE) 0.000
Fermi level wrt. vacuum (PBE) -5.520
DOS BZ

AB/2AgSe/4/fermi_surface.png

Atom No. Chemical symbol Charges [|e|]
0 Se -0.29
1 Se -0.29
2 Ag 0.29
3 Ag 0.29

AB/2AgSe/4/rpa-pol-x.png AB/2AgSe/4/rpa-pol-z.png
AB/2AgSe/4/rpa-pol-y.png
Properties
Interband polarizability (x) [Å] 198.474
Interband polarizability (y) [Å] 518.266
Interband polarizability (z) [Å] 0.434
Plasma frequency (x) [eV Å0.5] 7.774
Plasma frequency (y) [eV Å0.5] 7.801

AB/2AgSe/4/Raman.png
Mode Frequency (1/cm) Degeneracy
Mode 1 0.1 3
Mode 2 34.5 2
Mode 3 71.9 1
Mode 4 141.9 1
Mode 5 144.2 1
Mode 6 162.9 2
Mode 7 167.2 2

Miscellaneous details
Unique ID 2AgSe-4
Number of atoms 4
Number of species 2
Formula Ag2Se2
Reduced formula AgSe
Stoichiometry AB
Unit cell area [Å2] 16.242
Original file-system folder /home/niflheim2/cmr/C2DB-ASR/tree/AB/AgSe/Ag2Se2-8b7d07d7fc05
Old uid Ag2Se2-8b7d07d7fc05
Space group (bulk in AA-stacking) P-3m1
Space group number (bulk in AA-stacking) 164
Point group -3m
Inversion symmetry Yes
Layer group number 72
Layer group p-3m1
2D Bravais type Hexagonal (hp)
Thickness [Å] 3.379
Structure origin original03-18
Band gap (PBE) [eV] 0.000
Miscellaneous details
Direct band gap (PBE) [eV] 0.000
gap_dir_nosoc 0.000
Vacuum level [eV] 3.156
Fermi level wrt. vacuum (PBE) [eV] -5.520
minhessianeig -0.000
Dynamically stable Yes
Interband polarizability (x) [Å] 198.474
Interband polarizability (y) [Å] 518.266
Interband polarizability (z) [Å] 0.434
Plasma frequency (x) [eV Å0.5] 7.774
Plasma frequency (y) [eV Å0.5] 7.801
Energy [eV] -12.033
Magnetic No
Spin axis z
Magnetic anisotropy energy, xz [meV/unit cell] 0.000
Magnetic anisotropy energy, yz [meV/unit cell] 0.000
Energy above convex hull [eV/atom] 0.220
Heat of formation [eV/atom] 0.153