Multilevel Tunnelling Systems and Fractal Clustering in the Low-Temperature Mixed Alkali-Silicate Glasses

Figure 14

(Main) Variation with the magnetic Aharonov-Bohm phase 𝜙 of the energy spectrum (units 𝐷₂=1) for the case 𝐷₁=0 and a choice of 𝐸₁,𝐸₂,𝐸₃,𝐸₄ with 𝐸²₁+𝐸²₂+𝐸²₃+𝐸²₄/𝐷₂=0.01. This is to be compared with the 3LS energy spectrum, Figure 5. (Inset) The energy spectrum in the opposite case, 𝐷₂=0, and a choice of 𝐸₁,𝐸₂,𝐸₃,𝐸₄ with 𝐷₁ about 100 times stronger.