Cyclotron resonance of composite fermions
Cyclotron resonance of composite fermions
复制标题
复合费米子的回旋共振
DOI:
10.1038/415409a
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发表时间:
2002
期刊:
影响因子:
64.8
通讯作者:
W. Wegscheider
中科院分区:
文献类型:
--
作者:
I.V. Kukushkin;J.H. Smet;K. von Klitzing;W. Wegscheider
It is occasionally possible to interpret strongly interacting many-body systems within a single-particle framework by introducing suitable fictitious entities, or ‘quasi-particles’. A notable recent example of the successful application of such an approach is for a two-dimensional electron system that is exposed to a strong perpendicular magnetic field. The conduction properties of the system are governed by electron–electron interactions, which cause the fractional quantum Hall effect. Composite fermions, electrons that are dressed with magnetic flux quanta pointing opposite to the applied magnetic field, were identified as apposite quasi-particles that simplify our understanding of the fractional quantum Hall effect,. They precess, like electrons, along circular cyclotron orbits, but with a diameter determined by a reduced effective magnetic field,,,,,,. The frequency of their cyclotron motion has hitherto remained enigmatic, as the effective mass is no longer related to the band mass of the original electrons and is entirely generated from electron–electron interactions. Here we demonstrate enhanced absorption of a microwave field in the composite fermion regime, and interpret it as a resonance with the frequency of their circular motion. From this inferred cyclotron resonance, we derive a composite fermion effective mass that varies from 0.7 to 1.2 times that of the electron mass in vacuum as their density is tuned from 0.6 × 1011cm-2to 1.2 × 1011cm-2.
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影响因子:
8.6
作者:
Rui-Rui Du-Rui;H. Stormer;D. C. Tsui;Pfeiffer Ln;K. West
通讯作者:
Rui-Rui Du-Rui;H. Stormer;D. C. Tsui;Pfeiffer Ln;K. West
DOI:
--
发表时间:
2000
期刊:
影响因子:
--
作者:
J. Jain
通讯作者:
J. Jain
DOI:
--
发表时间:
2000
期刊:
影响因子:
--
作者:
S. Gubarev;I. Kukushkin;S. Tovstonog;M. Y. Akimov;J. Smet;K. Klitzing;W. Wegscheider
通讯作者:
W. Wegscheider
影响因子:
8.6
作者:
J. H. Smet;Dieter Weiss;Robert H. Blick;Gerd Lütjering;K. Klitzing;R. Fleischmann;R. Ketzmerick;T. Geisel;G. Weimann
通讯作者:
G. Weimann
DOI:
--
发表时间:
1998
期刊:
影响因子:
--
作者:
R. Willett
通讯作者:
R. Willett