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Statistics of conductances and subleading corrections to scaling near the integer quantum Hall plateau transition
| Title: | Statistics of conductances and subleading corrections to scaling near the integer quantum Hall plateau transition |
| Authors: | 小布施, 秀明 Browse this author →KAKEN DB | | Bera, S. Browse this author | | Ludwig, A. W. W. Browse this author | | Gruzberg, I. A. Browse this author | | Evers, F. Browse this author |
| Issue Date: | 25-Nov-2013 |
| Publisher: | Epl association, european physical society |
| Journal Title: | Epl |
| Volume: | 104 |
| Issue: | 2 |
| Start Page: | 27014 |
| Publisher DOI: | 10.1209/0295-5075/104/27014 |
| Abstract: | We study the critical behavior near the integer quantum Hall plateau transition by focusing on the multifractal (MF) exponents X-q describing the scaling of the disorder-average moments of the point contact conductance T between two points of the sample, within the Chalker-Coddington network model. Past analytical work has related the exponents X-q to the MF exponents Delta(q) of the local density of states (LDOS). To verify this relation, we numerically determine the exponents X-q with high accuracy. We thereby provide, at the same time, independent numerical results for the MF exponents Delta(q) for the LDOS. The presence of subleading corrections to scaling makes such determination directly from scaling of the moments of T virtually impossible. We overcome this difficulty by using two recent advances. First, we construct pure scaling operators for the moments of T which have precisely the same leading scaling behavior, but no subleading contributions. Secondly, we take into account corrections to scaling from irrelevant (in the renormalization group sense) scaling fields by employing a numerical technique ("stability map") recently developed by us. We thereby numerically confirm the relation between the two sets of exponents, X-q (point contact conductances) and Delta(q) (LDOS), and also determine the leading irrelevant (corrections to scaling) exponent y as well as other subleading exponents. Our results suggest a way to access multifractality in an experimental setting. Copyright (C) EPLA, 2013 |
| Relation: | http://iopscience.iop.org/0295-5075 |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/57108 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 小布施 秀明
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