Table 1 Calculated parameters of Eq. 7 and optical levels of XV(0) defects. The δ is the energy difference between the \(|\,{}^3\tilde A_{2u}\rangle\) and \(|\,{}^3\tilde E_u\rangle\) states

From: The (eg ⊗ eu) ⊗ Eg product Jahn–Teller effect in the neutral group-IV vacancy quantum bits in diamond

 

SiV

GeV

SnV

PbV

\(\hbar \omega\) (meV)

75.9

78.2

81.3

81.4

\({\mathrm{\Lambda }}\) (meV)

78.3

88.6

99.5

119

\({\mathrm{\Xi }}\) (meV)

45

40

42

36

\(E_{{\mathrm{JT}}}^{(1)}\) (meV)

258

242

217

194

\(E_{{\mathrm{JT}}}^{(2)}\) (meV)

0.47

5.18

17.2

33.4

\(F_g\) (meV)

95

83

67

52

\(F_u\) (meV)

103

112

120

125

ZPL\((\,{}^3E_u)\) (eV)

1.34 (1.31a)

1.80

1.82

2.21

\(\delta\) \((\,{}^3E_u \leftrightarrow \,{}^3A_{2u})\) (meV)

6.7 (6.8b)

7.6

9.3

10.8

  1. We note that the zero phonon line (ZPL) of SnV and PbV may be lowered induced by the spin–orbit coupling that we neglect here. The values inside the parenthesis are experimental data
  2. The δ is the energy difference between the \(|\,{}^3\tilde A_{2u}\rangle\) and \(|\,{}^3\tilde E_u\rangle\) states
  3. aExperimental data from ref. 34
  4. bExperimental data from ref. 36
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