Absence of nonlocal resistance in microstructures of PbTe quantum wells
PBN-AR
Instytucja
Wydział Matematyczno-Przyrodniczy.Szkoła Nauk Ścisłych (Uniwersytet Kardynała Stefana Wyszyńskiego w Warszawie)
Informacje podstawowe
Główny język publikacji
en
Czasopismo
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
ISSN
0370-1972
EISSN
1521-3951
Wydawca
WILEY-BLACKWELL
DOI
URL
Rok publikacji
2013
Numer zeszytu
1
Strony od-do
37-47
Numer tomu
250
Identyfikator DOI
Liczba arkuszy
Słowa kluczowe
en
PbTe
nonlocal transport
topological insulators
Streszczenia
Język
en
Treść
We report on experiments allowing to set an upper limit on the magnitude of the spin Hall effect and the conductance by edge channels in quantum wells of PbTe embedded between PbEuTe barriers. We reexamine previous data obtained for epitaxial microstructures of n-type PbSe and PbTe, in which pronounced nonlocal effects and reproducible magnetoresistance oscillations were found. Here we show that these effects are brought about by a quasi-periodic network of threading dislocations adjacent to the BaF2 substrate, which give rise to a p-type interfacial layer and an associated parasitic parallel conductance. We then present results of transport measurements on microstructures of modulation doped PbTe/(Pb,Eu)Te:Bi heterostructures for which the influence of parasitic parallel conductance is minimized, and for which quantum Hall transport had been observed, on similar samples, previously. These structures are of H-shaped geometry and they are patterned of 12?nm thick strained PbTe quantum wells embedded between Pb0.92Eu0.08Te barriers. The structures have different lateral sizes corresponding to both diffusive and ballistic electron transport in non-equivalent L valleys. For these structures no nonlocal resistance is detected confirming that PbTe is a trivial insulator. The magnitude of spin Hall angle ? is estimated to be smaller than 0.02 for PbTe/PbEuTe microstructures in the diffusive regime.
Cechy publikacji
ORIGINAL_ARTICLE
Inne
System-identifier
682458
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