| | |
| | |
Stat |
Members: 3645 Articles: 2'500'096 Articles rated: 2609
19 April 2024 |
|
| | | |
|
Article overview
| |
|
Collapse of Spin-Splitting in the Quantum Hall Effect | M.M.Fogler
; B.I.Shklovskii
; | Date: |
19 Jun 1995 | Journal: | Phys. Rev. B 52, 17366 (1995). | Subject: | cond-mat | Affiliation: | University of Minnesota | Abstract: | It is known experimentally that at not very large filling factors $
u$ the quantum Hall conductivity peaks corresponding to the same Landau level number $N$ and two different spin orientations are well separated. These peaks occur at half-integer filling factors $
u = 2 N + 1/2$ and $
u = 2 N + 3/2$ so that the distance between them $delta
u$ is unity. As $
u$ increases $delta
u$ shrinks. Near certain $N = N_c$ two peaks abruptly merge into a single peak at $
u = 2N + 1$. We argue that this collapse of the spin-splitting at low magnetic fields is attributed to the disorder-induced destruction of the exchange enhancement of the electron $g$-factor. We use the mean-field approach to show that in the limit of zero Zeeman energy $delta
u$ experiences a second-order phase transition as a function of the magnetic field. We give explicit expressions for $N_c$ in terms of a sample’s parameters. For example, we predict that for high-mobility heterostructures $N_c = 0.9 d n^{5/6} n_i^{-1/3},$ where $d$ is the spacer width, $n$ is the density of the two-dimensional electron gas, and $n_i$ is the two-dimensional density of randomly situated remote donors. | Source: | arXiv, cond-mat/9506084 | Services: | Forum | Review | PDF | Favorites |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser claudebot
|
| |
|
|
|
| News, job offers and information for researchers and scientists:
| |