Electrically controlled dc and ac transport in bilayer WSe2
Апстракт
We investigate quantum transport in a bilayer WSe2 in the presence of an external potential V and interlayer coupling. The dc and ac conductivities are evaluated in the framework of linear response theory. As functions of the Fermi energy, the dc ones exhibit a nonmonotonic behavior with a flat region in the band gap. A deep local minimum is visible in spin-Hall conductivity near the top of the valence band as a consequence of a large valence band splitting. On the other hand, the ac spin- and valley-Hall conductivities, as functions of the frequency, show two opposite peaks near the top of the valence band. The spin-Hall conductivity exhibits a minimum value at V = 0 whereas the valley-Hall conductivity decreases monotonically upon varying V from negative to positive values. Furthermore, we evaluate the power absorption spectrum and assess its dependence on the spin and valley degrees of freedom. The results are pertinent to the development of electrically controlled spintronic and va...lleytronic devices based on bilayer WSe2 and other group VI semiconductors.
Извор:
Physical Review B, 2018, 98, 7, 075429-Издавач:
- American Physical Society (APS)
Финансирање / пројекти:
- Colorado State University
- Микро, нано-системи и сензори за примену у електропривреди, процесној индустрији и заштити животне средине (RS-MESTD-Technological Development (TD or TR)-32008)
- Canadian NSERC Grant - OGP0121756
DOI: 10.1103/PhysRevB.98.075429
ISSN: 2469-9950
WoS: 000442806600007
Scopus: 2-s2.0-85052820628
Институција/група
IHTMTY - JOUR AU - Tahir, Muhammad AU - Krstajić, Predrag AU - Vasilopoulos, Panagiotis PY - 2018 UR - https://cer.ihtm.bg.ac.rs/handle/123456789/2418 AB - We investigate quantum transport in a bilayer WSe2 in the presence of an external potential V and interlayer coupling. The dc and ac conductivities are evaluated in the framework of linear response theory. As functions of the Fermi energy, the dc ones exhibit a nonmonotonic behavior with a flat region in the band gap. A deep local minimum is visible in spin-Hall conductivity near the top of the valence band as a consequence of a large valence band splitting. On the other hand, the ac spin- and valley-Hall conductivities, as functions of the frequency, show two opposite peaks near the top of the valence band. The spin-Hall conductivity exhibits a minimum value at V = 0 whereas the valley-Hall conductivity decreases monotonically upon varying V from negative to positive values. Furthermore, we evaluate the power absorption spectrum and assess its dependence on the spin and valley degrees of freedom. The results are pertinent to the development of electrically controlled spintronic and valleytronic devices based on bilayer WSe2 and other group VI semiconductors. PB - American Physical Society (APS) T2 - Physical Review B T1 - Electrically controlled dc and ac transport in bilayer WSe2 VL - 98 IS - 7 SP - 075429 DO - 10.1103/PhysRevB.98.075429 ER -
@article{ author = "Tahir, Muhammad and Krstajić, Predrag and Vasilopoulos, Panagiotis", year = "2018", abstract = "We investigate quantum transport in a bilayer WSe2 in the presence of an external potential V and interlayer coupling. The dc and ac conductivities are evaluated in the framework of linear response theory. As functions of the Fermi energy, the dc ones exhibit a nonmonotonic behavior with a flat region in the band gap. A deep local minimum is visible in spin-Hall conductivity near the top of the valence band as a consequence of a large valence band splitting. On the other hand, the ac spin- and valley-Hall conductivities, as functions of the frequency, show two opposite peaks near the top of the valence band. The spin-Hall conductivity exhibits a minimum value at V = 0 whereas the valley-Hall conductivity decreases monotonically upon varying V from negative to positive values. Furthermore, we evaluate the power absorption spectrum and assess its dependence on the spin and valley degrees of freedom. The results are pertinent to the development of electrically controlled spintronic and valleytronic devices based on bilayer WSe2 and other group VI semiconductors.", publisher = "American Physical Society (APS)", journal = "Physical Review B", title = "Electrically controlled dc and ac transport in bilayer WSe2", volume = "98", number = "7", pages = "075429", doi = "10.1103/PhysRevB.98.075429" }
Tahir, M., Krstajić, P.,& Vasilopoulos, P.. (2018). Electrically controlled dc and ac transport in bilayer WSe2. in Physical Review B American Physical Society (APS)., 98(7), 075429. https://doi.org/10.1103/PhysRevB.98.075429
Tahir M, Krstajić P, Vasilopoulos P. Electrically controlled dc and ac transport in bilayer WSe2. in Physical Review B. 2018;98(7):075429. doi:10.1103/PhysRevB.98.075429 .
Tahir, Muhammad, Krstajić, Predrag, Vasilopoulos, Panagiotis, "Electrically controlled dc and ac transport in bilayer WSe2" in Physical Review B, 98, no. 7 (2018):075429, https://doi.org/10.1103/PhysRevB.98.075429 . .