Table 1. Linear Thermal Expansion Coefficient (CTE) at Standard Conditions (T ≈ 300 K) for the Materials in the Hole Spin Qubit Device.

material	α [10–6 K–1]	ref
Pd	11.7	(32)
Si	2.56	(33)
Ge	5.9	(34)
Si0.2Ge0.8	4.64	(35)
Al2O3	5.47	(36)