The real part Re
[
ε
T
]
as a function of
(
δ
−
ω
m
)
/
ω
m
and J (J was
2
π
×
8
kHz) with different mechanical driving fields under different situations: η = 1,
ϕ
=
π
(red dashed curve);
η
=
0
(blue solid curve); η = 1, ϕ = 0 (green dotted curve). The coupling strength is
J
/
2
π
=
0.07
kHz
, 0.14 kHz, 0.7 kHz, 1.4 kHz, 7 kHz, 14 kHz, 70 kHz, 140 kHz, respectively. The other parameters are the same as those in Fig. 2.
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