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Spin-Conserving Resonant Tunneling in Twist-Controlled WSe2-hBN-WSe2 Heterostructures
Nano Letters ( IF 9.6 ) Pub Date : 2018-08-14 00:00:00 , DOI: 10.1021/acs.nanolett.8b02770 Kyounghwan Kim 1 , Nitin Prasad 1 , Hema C. P. Movva 1 , G. William Burg 1 , Yimeng Wang 1 , Stefano Larentis 1 , Takashi Taniguchi 2 , Kenji Watanabe 2 , Leonard F. Register 1 , Emanuel Tutuc 1
Nano Letters ( IF 9.6 ) Pub Date : 2018-08-14 00:00:00 , DOI: 10.1021/acs.nanolett.8b02770 Kyounghwan Kim 1 , Nitin Prasad 1 , Hema C. P. Movva 1 , G. William Burg 1 , Yimeng Wang 1 , Stefano Larentis 1 , Takashi Taniguchi 2 , Kenji Watanabe 2 , Leonard F. Register 1 , Emanuel Tutuc 1
Affiliation
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We investigate interlayer tunneling in heterostructures consisting of two tungsten diselenide (WSe2) monolayers with controlled rotational alignment, and separated by hexagonal boron nitride. In samples where the two WSe2 monolayers are rotationally aligned we observe resonant tunneling, manifested by a large conductance and negative differential resistance in the vicinity of zero interlayer bias, which stem from energy- and momentum-conserving tunneling. Because the spin–orbit coupling leads to coupled spin-valley degrees of freedom, the twist between the two WSe2 monolayers allows us to probe the conservation of spin-valley degree of freedom in tunneling. In heterostructures where the two WSe2 monolayers have a 180° relative twist, such that the Brillouin zone of one layer is aligned with the time-reversed Brillouin zone of the opposite layer, the resonant tunneling between the layers is suppressed. These findings provide evidence that, in addition to momentum, the spin-valley degree of freedom is also conserved in vertical transport.
中文翻译：
扭曲控制的WSe 2 -hBN-WSe 2异质结构中的自旋保守共振隧穿
我们研究异质结构中的层间隧穿，该异质结构由两个具有受控旋转排列的二硒化钨（WSe 2）单层组成，并被六方氮化硼隔开。在两个WSe 2单层旋转对齐的样品中，我们观察到共振隧穿，其表现为零层间偏压附近的大电导和负微分电阻，这归因于能量和动量守恒的隧穿。因为自旋-轨道耦合导致自旋谷自由度耦合，所以两个WSe 2单层之间的扭曲使我们能够探究隧道效应中自旋谷自由度的守恒性。在两个WSe 2的异质结构中单层具有180°的相对扭曲，从而使一层的布里渊区与相对层的时间反转的布里渊区对齐，从而抑制了层之间的共振隧穿。这些发现提供了证据，证明除了垂直动量以外，自旋谷自由度也得到了保留。
更新日期：2018-08-14
中文翻译：
扭曲控制的WSe 2 -hBN-WSe 2异质结构中的自旋保守共振隧穿
我们研究异质结构中的层间隧穿，该异质结构由两个具有受控旋转排列的二硒化钨（WSe 2）单层组成，并被六方氮化硼隔开。在两个WSe 2单层旋转对齐的样品中，我们观察到共振隧穿，其表现为零层间偏压附近的大电导和负微分电阻，这归因于能量和动量守恒的隧穿。因为自旋-轨道耦合导致自旋谷自由度耦合，所以两个WSe 2单层之间的扭曲使我们能够探究隧道效应中自旋谷自由度的守恒性。在两个WSe 2的异质结构中单层具有180°的相对扭曲，从而使一层的布里渊区与相对层的时间反转的布里渊区对齐，从而抑制了层之间的共振隧穿。这些发现提供了证据，证明除了垂直动量以外，自旋谷自由度也得到了保留。
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