2020
DOI: 10.1103/physrevlett.124.177701
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Observation of the Spin-Orbit Gap in Bilayer Graphene by One-Dimensional Ballistic Transport

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Cited by 71 publications
(60 citation statements)
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“…Although the single-particle spectrum in BLG QDs has been intensively studied in recent years 9 11 , the low-energy spin-valley coupling in BLG QDs has remained experimentally unexplored. This is certainly partly due to the high energy resolution required, as theoretical studies predict an intrinsic spin-orbit (SO) coupling in graphene and BLG of around Δ SO ≈ 24 μ eV 12 16 and only recently, experiments have – partly indirectly – reported values in the range between 40 and 80 μ eV 17 , 18 . Moreover, our current knowledge with respect to a possible mixing of and states is very limited.…”
Section: Introductionmentioning
confidence: 99%
“…Although the single-particle spectrum in BLG QDs has been intensively studied in recent years 9 11 , the low-energy spin-valley coupling in BLG QDs has remained experimentally unexplored. This is certainly partly due to the high energy resolution required, as theoretical studies predict an intrinsic spin-orbit (SO) coupling in graphene and BLG of around Δ SO ≈ 24 μ eV 12 16 and only recently, experiments have – partly indirectly – reported values in the range between 40 and 80 μ eV 17 , 18 . Moreover, our current knowledge with respect to a possible mixing of and states is very limited.…”
Section: Introductionmentioning
confidence: 99%
“…The device studied in this work consists of a BLG flake encapsulated between two crystals of hexagonal boron nitride (hBN), placed on a graphite gate using the conventional van der Waals stacking technology. [6] Similar to previous work studying BLG gate-defined quantum point contacts [7][8][9] and QDs, [10][11][12][13][14][15] two layers of gold gates are evaporated on top: A pair of split gates (SGs) is used to form a 150 nm wide conducting channel connecting the source and drain reservoirs of the device (see Figure 1a). On top, separated by a 30 nm thick film of atomic layer deposited Al 2 O 3 , we place a gold finger gate (FG) with a width of 70 nm (see Figure 1a,b).…”
Section: Fabricationmentioning
confidence: 99%
“…[16][17][18] Similar to recent works, we can form a QD underneath the FG by locally overcompensating the applied back gate voltage. [9][10][11]13,14] A small n-doped island is created underneath the FG, which is separated from the p-doped channel by the bandgap acting as a tunnel barrier (see schematic in Figure 1a). [13,11] We measure the current through the device as a function of V FG (Figure 1c).…”
Section: To Bothmentioning
confidence: 99%
“…Layered hBN is a perfect substrate for graphene spintronics, allowing for giant mobilities in graphene/hBN structures 6 , ultralong spin lifetimes 1,4,11,14,64 , for extracting spin-orbit gaps in bilayer graphene 65 , or for revealing surprisingly strong spin-orbit anisotropy also in bilayer graphene 66,67 . On the other hand, hBN induces only a weak SOC in graphene 5 to be able to investigate proximity effects.…”
Section: Introductionmentioning
confidence: 99%