Acta mathematica scientia,Series B ›› 2023, Vol. 43 ›› Issue (5): 1997-2004.doi: 10.1007/s10473-023-0504-x

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THE HAUSDORFF DIMENSION OF THE SPECTRUM OF A CLASS OF GENERALIZED THUE-MORSE HAMILTONIANS*

Qinghui LIU1,†, Zhiyi Tang1,2   

  1. 1. School of Computer Science and Technology, Beijing Institute of Technology, Beijing 100081, China;
    2. School of Mathematics and Physics, Hubei Polytechnic University, Huangshi 435003, China
  • Received:2022-03-10 Revised:2023-04-08 Published:2023-10-25
  • Contact: †Qinghui LIU, E-mail: qhliu@bit.edu.cn
  • About author:Zhiyi Tang, E-mail: tangzhiyi@hbpu.edu.cn
  • Supported by:
    National Natural Science Foundation of China (11871098).

Abstract: Let τ be a generalized Thue-Morse substitution on a two-letter alphabet {a,b}:τ(a)=ambm, τ(b)=bmams for the integer m2. Let ξ be a sequence in {a,b}Z that is generated by τ. We study the one-dimensional Schrödinger operator Hm,λ on l2(Z) with a potential given by v(n)=λVξ(n),

where λ>0 is the coupling and Vξ(n)=1 (Vξ(n)=1) if ξ(n)=a (ξ(n)=b). Let Λ2=2, and for m>2, let Λm=m if m0mod4; let Λm=m3 if m1mod4; let Λm=m2 if m2mod4; let Λm=m1 if m3mod4. We show that the Hausdorff dimension of the spectrum σ(Hm,λ) satisfies that dimHσ(Hm,λ)>logΛmlog64m+4.
It is interesting to see that dimHσ(Hm,λ) tends to 1 as m tends to infinity.

Key words: one-dimensional Schrödinger operator, generalized Thue-Morse sequence, Hausdorff dimension

CLC Number: 

  • 28A78
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