Absolutely Continuous Spectra of Quantum Tree Graphs with Weak Disorder

نویسندگان
چکیده

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Absolutely Continuous Spectra of Quantum Tree Graphs with Weak Disorder

We consider the Laplacian on a rooted metric tree graph with branching number K ≥ 2 and random edge lengths given by independent and identically distributed bounded variables. Our main result is the stability of the absolutely continuous spectrum for weak disorder. A useful tool in the discussion is a function which expresses a directional transmission amplitude to infinity and forms a generali...

متن کامل

On the absence of absolutely continuous spectra for Schrödinger operators on radial tree graphs

The subject of the paper are Schrödinger operators on tree graphs which are radial having the branching number bn at all the vertices at the distance tn from the root. We consider a family of coupling conditions at the vertices characterized by (bn− 1)+4 real parameters. We prove that if the graph is sparse so that there is a subsequence of {tn+1 − tn} growing to infinity, in the absence of the...

متن کامل

Wiener - Hopf Operators and Absolutely Continuous Spectra

CONTINUOUS SPECTRA. II BY C. R. PUTNAM Communicated by Maurice Heins, November 1, 1967 1. This paper is a continuation of [4]. It may be recalled that if A is a self-adjoint operator on a Hubert space § with spectral resolution A=zf\dE\, then the set of elements x in § for which ||-Ex#|| is an absolutely continuous function of X is a subspace, &a(A), of § (see, e.g., Halmos [l, p. 104]). The op...

متن کامل

Stability of the Absolutely Continuous Spectrum of Random Schrödinger Operators on Tree Graphs

The subject of this work are random Schrödinger operators on regular rooted tree graphs T with stochastically homogeneous disorder. The operators are of the form Hλ(ω) = T + U + λV (ω) acting in l(T), with T the adjacency matrix, U a radially periodic potential, and V (ω) a random potential. This includes the only class of homogeneously random operators for which it was proven that the spectrum...

متن کامل

Trace Class Perturbations and the Absence of Absolutely Continuous Spectra

We show that various Hamiltonians and Jacobi matrices have no absolutely continuous spectrum by showing that under a trace class perturbation they become a direct sum of finite matrices.

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ژورنال

عنوان ژورنال: Communications in Mathematical Physics

سال: 2005

ISSN: 0010-3616,1432-0916

DOI: 10.1007/s00220-005-1468-5