Numerical results for the Anderson transition .
نویسنده
چکیده
Answer to cond-mat/0106005, cond-mat/0106006 and additional notes are given concerning my previous comment (cond-mat/0105325). Recently I have discussed the numerical results for the Anderson transition [1]. Objections [2] and [3] have appeared after that. We answer here to the arguments of [2, 3] and give the additional comments. 1. I did not state in [1] that ν = 1 (in fact, my most probable value was 1.25). I tried to show that a problem exists: numerical results contradict to all other information on the critical exponents. It is not my personal problem, and it is not my personal affair to solve it. Indeed, a value ν ≈ 1 is desirable from viewpoint of this other information and I tried to understand, is not it possible to agree it with the raw numerical data by the change of interpretation and by more realistic estimation of errors. I found it possible for the data that I considered as the best. May be I was a little wrong in the latter estimation. Authors of [2] argue that I used the systems of too small size (28 3), " while currently sizes ∼ 50 3 (for ELS) and 18 2 × 10 8 (for TM) are standard " 1. A size 18 2 × 10 8 should kick a man out his feet, while authors of [2] know perfectly well that only the minimal length scale (L = 18) is relevant. In fact, such systems are small. 2 I do not know about " currently " and " standard " but only one result is cited in [2] for systems ∼ 50 3 [6]. With my procedure used, authors of [2] obtained this result with uncertanty ν = 1.25 ÷ 1.75, which is not drastically different from uncertainty 0.8 ÷ 1.7 that I have derived from Zharekeshev and Kramer data [7]. So, it is admitted that the largest scale data give uncertainty 1.25 ÷ 1.75 and not 1% [5]. At the present stage, I am quite satisfied with such progress. 1 Abbreviations of [2]: TM and ELS — transfer matrix and energy level statistics methods, FSS — finite size scaling. 2 I can understand such trick in the text, where authors of [2] are in the course of discussion, but the same thing is present in the figure capture: " the system sizes of TM data are larger than for ELS data " .
منابع مشابه
Review of recent progress on numerical studies of the Anderson transition
Abstract. A review of recent progress in numerical studies of the Anderson transition in three dimensional systems is presented. From high precision calculations the critical exponent ν for the divergence of the localization length is estimated to be ν = 1.57 ± 0.02 for the orthogonal universality class, which is clearly distinguished from ν = 1.43 ± 0.03 for the unitary universality class. The...
متن کاملNumerical Analysis of the Effect of External Circumferential Elliptical Cracks in Transition Thickness Zone of Pressurized Pipes Using XFEM
The present work investigates the effect of the elliptical three-dimensional (3D) cracks on a pipe with thickness transition, considering internal pressure. Level sets were defined using the extended finite element method (XFEM), the stress intensity factors (SIFs) of 3D cracks were investigated and compared between straight pipes and pipes with thickness transition. The results show that the X...
متن کاملCritical behavior at the mott-anderson transition: a typical-medium theory perspective.
We present a detailed analysis of the critical behavior close to the Mott-Anderson transition. Our findings are based on a combination of numerical and analytical results obtained within the framework of typical-medium theory-the simplest extension of dynamical mean field theory capable of incorporating Anderson localization effects. By making use of previous scaling studies of Anderson impurit...
متن کاملMultifractal wave functions of simple quantum maps.
We study numerically multifractal properties of two models of one-dimensional quantum maps: a map with pseudointegrable dynamics and intermediate spectral statistics and a map with an Anderson-like transition recently implemented with cold atoms. Using extensive numerical simulations, we compute the multifractal exponents of quantum wave functions and study their properties, with the help of tw...
متن کاملDoes One-third Scheme of PBE0 Functional Dominate Over PBE0 for Electronic Properties of Transition Metal Compounds?
The one-third paradigm of PBE0 density functional, PBE0-1/3, has shown to be a successful method for various properties. In this paper, the applicability of PBE0-1/3 is put into broader perspective for transition metals chemistry. As a comparative study, the performance of PBE0 and PBE0-1/3 has been assessed for geometries and vibrational frequencies of some transition metal hydrides and transi...
متن کاملDistribution of conductance for Anderson insulators: A theory with a single parameter
We obtain an analytic expression for the full distribution of conductance for a strongly disordered threedimensional conductor within a perturbative approach based on transfer-matrix formulation. Our results confirm the numerical evidence that the log-normal limit of the distribution is not reached even in the deeply insulating regime. We show that the variance of the logarithm of the conductan...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2001