Fractional quantum Hall valley ferromagnetism in the extreme quantum limit
Fractional quantum Hall valley ferromagnetism in the extreme quantum limit
复制标题
极端量子极限下的分数量子霍尔谷铁磁性
DOI:
10.1103/physrevb.106.l201303
复制
发表时间:
2022
影响因子:
3.7
通讯作者:
Shayegan, M.
中科院分区:
文献类型:
--
作者:
Hossain, Md. Shafayat;Ma, Meng K.;Chung, Y. J.;Singh, S. K.;Gupta, A.;West, K. W.;Baldwin, K. W.;Pfeiffer, L. N.;Winkler, R.;Shayegan, M.
Electrons' multiple quantum degrees of freedom can lead to rich physics, including a competition between various exotic ground states, as well as novel applications such as spintronics and valleytronics. Here we report magnetotransport experiments demonstrating how the valley degree of freedom impacts the fractional quantum states (FQHSs), and the related magnetic-flux-electron composite fermions (CFs), at very high magnetic fields in the extreme quantum limit when only the lowest Landau level is occupied. Unlike in other multivalley two-dimensional electron systems such as Si or monolayer graphene and transition-metal dichalcogenides, in our AlAs sample we can continuously tune the valley polarization via the application ofin situstrain. We find that the FQHSs remain exceptionally strong even as they make valley polarization transitions, revealing a surprisingly robust ferromagnetism of the FQHSs and the underlying CFs. Our observation implies that the CFs are strongly interacting in our system. We are also able to obtain a phase diagram for the FQHS and CF valley polarization in the extreme quantum limit as we monitor transitions of the FHQSs with different valley polarizations.
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DOI:
10.1142/11751
发表时间:
2020-01
期刊:
Fractional Quantum Hall Effects
影响因子:
--
作者:
Steven H. Simon
通讯作者:
Steven H. Simon
影响因子:
8.6
作者:
Yuhe Zhang;A. Wójs;J. Jain
通讯作者:
J. Jain
影响因子:
8.6
作者:
D. Leadley;R. Nicholas;D. Maude;A. N. Utjuzh;J. Portal;J. Harris;C. Foxon
通讯作者:
C. Foxon
DOI:
10.1142/9789811217494_0002
发表时间:
2020
期刊:
--
影响因子:
--
作者:
B. Halperin
通讯作者:
B. Halperin
影响因子:
3.7
作者:
T. Gokmen;M. Shayegan
通讯作者:
M. Shayegan