Exchange in insulators
نویسندگان
چکیده
منابع مشابه
Exchange-coupling-induced symmetry breaking in topological insulators.
An exchange gap in the Dirac surface states of a topological insulator (TI) is necessary for observing the predicted unique features such as the topological magnetoelectric effect as well as to confine Majorana fermions. We experimentally demonstrate proximity-induced ferromagnetism in a TI, combining a ferromagnetic insulator EuS layer with Bi(2)Se(3), without introducing defects. By magnetic ...
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Ryan V. Mishmash,1 Matthew S. Block,1,2 Ribhu K. Kaul,2 D. N. Sheng,3 Olexei I. Motrunich,4 and Matthew P. A. Fisher1 1Department of Physics, University of California, Santa Barbara, California 93106, USA 2Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506, USA 3Department of Physics and Astronomy, California State University, Northridge, California 91330, US...
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The strongest interaction between microscopic spins in magnetic materials is the exchange interaction Jex. Therefore, ultrafast control of Jex holds the promise to control spins on ultimately fast timescales. We demonstrate that time-periodic modulation of the electronic structure by electric fields can be used to reversibly control Jex on ultrafast timescales in extended antiferromagnetic Mott...
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We demonstrate that a Mott insulator lightly doped with holes is still an insulator at low temperature even without disorder. Hole localization obtains because the chemical potential lies in a pseudogap which has a vanishing density of states at zero temperature. The energy scale for the pseudogap is set by the nearest-neighbor singlet-triplet splitting. As this energy scale vanishes if transit...
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With strong spin-orbit coupling, topological insulators have an insulating bulk state, characterized by a band gap, and a conducting surface state, characterized by a Dirac cone. Plasmons in topological insulators show high frequency-tunability in the mid-infrared and terahertz spectral regions with transverse spin oscillations, also called “spin-plasmons”. This paper presents a discussion and ...
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ژورنال
عنوان ژورنال: Bulletin of Materials Science
سال: 1981
ISSN: 0250-4707,0973-7669
DOI: 10.1007/bf02908493