| Structure info | |
|---|---|
| Layer group | p4/nmm |
| Layer group number | 64 |
| Structure origin | original03-18 |
| Stability | |
|---|---|
| Energy above convex hull [eV/atom] | 0.486 |
| Heat of formation [eV/atom] | -0.463 |
| Dynamically stable | No |
| Basic properties | |
|---|---|
| Magnetic | No |
| Band gap (PBE) [eV] | 0.000 |
| Symmetries | |
|---|---|
| 2D Bravais type | Square (tp) |
| Layer group number | 64 |
| Layer group | p4/nmm |
| Space group number (bulk in AA-stacking) | 129 |
| Space group (bulk in AA-stacking) | P4/nmm |
| Point group | 4/mmm |
| Inversion symmetry | Yes |
| Structure data | |
|---|---|
| Formula | S2Ta2 |
| Stoichiometry | AB |
| Number of atoms | 4 |
| Unit cell area [Å2] | 14.882 |
| Thickness [Å] | 3.327 |
| S2Ta2 (2STa-2) | |
|---|---|
| Heat of formation [eV/atom] | -0.46 |
| Energy above convex hull [eV/atom] | 0.49 |
| Monolayers from C2DB | |
|---|---|
| Ta7S12 (1Ta7S12-1) | -1.13 eV/atom |
| Ta8S12 (4Ta2S3-1) | -1.09 eV/atom |
| TaS2 (1TaS2-1) | -1.09 eV/atom |
| TaS2 (1TaS2-2) | -1.07 eV/atom |
| Ta7S12 (1Ta7S12-2) | -1.05 eV/atom |
| Ta9S12 (3Ta3S4-1) | -1.01 eV/atom |
| Ta4S6 (2Ta2S3-1) | -1.00 eV/atom |
| Ta8S12 (4Ta2S3-2) | -0.99 eV/atom |
| Ta9S12 (3Ta3S4-2) | -0.91 eV/atom |
| Ta4S12 (4TaS3-1) | -0.84 eV/atom |
| Ta2S6 (2TaS3-1) | -0.80 eV/atom |
| Ta4S12 (4TaS3-2) | -0.77 eV/atom |
| TaS2 (1TaS2-3) | -0.64 eV/atom |
| S2Ta4 (2STa2-1) | -0.62 eV/atom |
| S2Ta2 (2STa-1) | -0.51 eV/atom |
| S2Ta2, (2STa-2) | -0.46 eV/atom |
| S2Ta2 (2STa-3) | -0.45 eV/atom |
| S2Ta2 (2STa-4) | -0.41 eV/atom |
| S2Ta2 (2STa-5) | -0.40 eV/atom |
| S2Ta2 (2STa-6) | -0.39 eV/atom |
| S2 (2S-1) | 0.45 eV/atom |
| S2 (2S-2) | 0.62 eV/atom |
| Minimum eigenvalue of Hessian [eV/Ų] | -11.30 |
| Cij (N/m) | xx | yy | xy |
| xx | -49.64 | 192.31 | -0.00 |
| yy | 192.36 | -49.67 | 0.00 |
| xy | 0.00 | 0.00 | 127.46 |
| Stiffness tensor eigenvalues | |
| Eigenvalue 0 | -241.99 N/m |
| Eigenvalue 1 | 127.46 N/m |
| Eigenvalue 2 | 142.68 N/m |
| Key values [eV] | |
|---|---|
| Band gap (PBE) | 0.000 |
| Direct band gap (PBE) | 0.000 |
| Fermi level wrt. vacuum (PBE) | -5.436 |
| Atom No. | Chemical symbol | Charges [|e|] |
|---|---|---|
| 0 | Ta | 0.96 |
| 1 | Ta | 0.96 |
| 2 | S | -0.96 |
| 3 | S | -0.96 |
| Properties | |
|---|---|
| Interband polarizability (x) [Å] | 5.791 |
| Interband polarizability (y) [Å] | 5.822 |
| Interband polarizability (z) [Å] | 13.248 |
| Plasma frequency (x) [eV Å0.5] | 7.731 |
| Plasma frequency (y) [eV Å0.5] | 7.740 |
| Miscellaneous details | |
|---|---|
| Unique ID | 2STa-2 |
| Number of atoms | 4 |
| Number of species | 2 |
| Formula | S2Ta2 |
| Reduced formula | STa |
| Stoichiometry | AB |
| Unit cell area [Å2] | 14.882 |
| Original file-system folder | /home/niflheim2/cmr/C2DB-ASR/tree/AB/STa/S2Ta2-ba8a26f5e57c |
| Old uid | S2Ta2-ba8a26f5e57c |
| Space group (bulk in AA-stacking) | P4/nmm |
| Space group number (bulk in AA-stacking) | 129 |
| Point group | 4/mmm |
| Inversion symmetry | Yes |
| Layer group number | 64 |
| Layer group | p4/nmm |
| 2D Bravais type | Square (tp) |
| Thickness [Å] | 3.327 |
| 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] | 3.928 |
| Fermi level wrt. vacuum (PBE) [eV] | -5.436 |
| minhessianeig | -11.300 |
| Dynamically stable | No |
| Interband polarizability (x) [Å] | 5.791 |
| Interband polarizability (y) [Å] | 5.822 |
| Interband polarizability (z) [Å] | 13.248 |
| Plasma frequency (x) [eV Å0.5] | 7.731 |
| Plasma frequency (y) [eV Å0.5] | 7.740 |
| Energy [eV] | -29.639 |
| 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] | 0.486 |
| Heat of formation [eV/atom] | -0.463 |
