Observation of long-lived interlayer excitons in monolayer MoSe 2-WSe 2 heterostructures

Nature Communications

Volumn 6, Issue , 2015, Pages

  Rivera, Pasqual ^a   Schaibley, John R ^a   Jones, Aaron M ^a   Ross, Jason S ^b   Wu, Sanfeng ^a   Aivazian, Grant ^a   Klement, Philip ^a   Seyler, Kyle ^a   Clark, Genevieve ^b   Ghimire, Nirmal J ^c,d   Yan, Jiaqiang ^d,e   Mandrus, D G ^c,d,e   Yao, Wang ^f   Xu, Xiaodong ^a,b  

^a UNIVERSITY OF WASHINGTON   (United States)

^b University of Washington   (United States)

^c UNIVERSITY OF TENNESSEE   (United States)

^d OAK RIDGE NATIONAL LABORATORY   (United States)

^e University of Tennessee Knoxville   (United States)

^f UNIVERSITY OF HONG KONG   (Hong Kong)

Author keywords

[No Author keywords available]

Indexed keywords

CATION; EXCITON; MOLYBDENUM; POLY(METHYL METHACRYLATE); SELENIUM; TUNGSTEN; UNCLASSIFIED DRUG;

ELECTRIC FIELD; LIGHT EFFECT; LUMINESCENCE; PHOTOVOLTAIC SYSTEM; POLARIZATION;

ARTICLE; DIPOLE; ELECTRIC FIELD; ELECTRIC POTENTIAL; EXCITATION; LIGHT EMITTING DIODE; PHOTOLUMINESCENCE; POLARIZATION; X RAY PHOTOELECTRON SPECTROSCOPY;

EID: 84923914376     PISSN: None     EISSN: 20411723     Source Type: Journal    
DOI: 10.1038/ncomms7242     Document Type: Article

References (34)

1. Geim, A. K. & Grigorieva, I. V. Van der Waals heterostructures. Nature 499, 419-425 (2013).
2. Dean, C. R. et al. Boron nitride substrates for high-quality graphene electronics. Nat. Nanotechnol. 5, 722-726 (2010).
3. Hunt, B. et al. Massive Dirac fermions and Hofstadter butterfly in a van der Waals heterostructure. Science 340, 1427-1430 (2013).
4. Dean, C. R. et al. Hofstadter's butterfly and the fractal quantum Hall effect in moire superlattices. Nature 497, 598-602 (2013).
5. Ponomarenko, L. A. et al. Cloning of Dirac fermions in graphene superlattices. Nature 497, 594-597 (2013).
6. Novoselov, K. S. et al. Two-dimensional atomic crystals. Proc. Natl Acad. Sci USA 102, 10451-10453 (2005).
7. Mak, K. F., Lee, C., Hone, J., Shan, J. & Heinz, T. F. Atomically thin MoS2: a new direct-gap semiconductor. Phys. Rev. Lett. 105, 136805 (2010).
8. Splendiani A. et al. Emerging photoluminescence in monolayer MoS2. Nano Lett. 10, 1271-1275 (2010).
9. Mak, K. F. et al. Tightly bound trions in monolayer MoS2. Nat. Mater. 12, 207-211 (2013).
10. Ross, J. S. et al. Electrical control of neutral and charged excitons in a monolayer semiconductor. Nat. Commun. 4, 1474 (2013).
11. Xiao, D., Liu, G.-B., Feng, W., Xu, X. & Yao, W. Coupled spin and valley physics in monolayers of MoS2 and other group-VI dichalcogenides. Phys. Rev. Lett. 108, 196802 (2012).
12. Cao, T. et al. Valley-selective circular dichroism of monolayer molybdenum disulphide. Nat. Commun. 3, 887 (2012).
13. Zeng, H., Dai, J., Yao, W., Xiao, D. & Cui, X. Valley polarization in MoS2 monolayers by optical pumping. Nat. Nanotechnol. 7, 490-493 (2012).
14. Mak, K. F., He, K., Shan, J. & Heinz, T. F. Control of valley polarization in monolayer MoS2 by optical helicity. Nat. Nanotechnol. 7, 494-498 (2012).
15. Jones, A. M. et al. Optical generation of excitonic valley coherence in monolayer WSe2. Nat. Nanotechnol. 8, 634-638 (2013).
16. Gong, Z. et al. Magnetoelectric effects and valley-controlled spin quantum gates in transition metal dichalcogenide bilayers. Nat. Commun. 4, 2053 (2013).
17. Jones, A. M. et al. Spin-layer locking effects in optical orientation of exciton spin in bilayer WSe2. Nat. Phys. 10, 130-134 (2014).
18. Kang, J., Tongay, S., Zhou, J., Li, J. & Wu, J. Band offsets and heterostructures of two-dimensional semiconductors. Appl. Phys. Lett. 102, 012111-012114 (2013).
19. Kos̈mider, K. & Fernández-Rossier, J. Electronic properties of the MoS2-WS2 heterojunction. Phys. Rev. B 87, 075451 (2013).
20. Terrones, H., Lopez-Urias, F. & Terrones, M. Novel hetero-layered materials with tunable direct band gaps by sandwiching different metal disulfides and diselenides. Sci. Rep. 3, 1549 (2013).
21. Chiu, M.-H. et al.Determination of band alignment in transition metal dichalcogenide heterojunctions, Preprint at http://arXiv:1406.5137 (2014).
22. Su, J.-J. & MacDonald, A. H. How to make a bilayer exciton condensate flow. Nat. Phys. 4, 799-802 (2008).
23. Hong, X. P. et al. Ultrafast charge transfer in atomically thin MoS2/WS2 heterostructures. Nat. Nanotechnol. 9, 682-686 (2014).
24. Wang, G. et al. Valley dynamics probed through charged and neutral exciton emission in monolayer WSe2. Phys. Rev. B 90, 075413 (2014).
25. Lagarde, D. et al. Carrier and polarization dynamics in monolayer MoS2. Phys. Rev. Lett. 112, 047401 (2014).
26. Mai, C. et al. Many-body effects in valleytronics: direct measurement of valley lifetimes in single-layer MoS2. Nano Lett. 14, 202-206 (2013).
27. Shi, H. et al. Exciton dynamics in suspended monolayer and few-layer MoS2 2D crystals. ACS Nano 7, 1072-1080 (2012).
28. Kormányos, A., Zólyomi, V., Drummond, N. D. & Burkard, G. Spin-orbit coupling, quantum dots, and qubits in monolayer transition metal dichalcogenides. Phys. Rev. X 4, 011034 (2014).
29. Butov, L. V., Lai, C. W., Ivanov, A. L., Gossard, A. C. & Chemla, D. S. Towards Bose-Einstein condensation of excitons in potential traps. Nature 417, 47-52 (2002).
30. Fogler, M. M., Butov, L. V. & Novoselov, K. S. High-temperature superfluidity with indirect excitons in van der Waals heterostructures. Nat. Commun. 5, 4555 (2014).
31. Lee, C. H. et al. Atomically thin p-n junctions with van der Waals heterointerfaces. Nat. Nanotechnol. 9, 676-681 (2014).
32. Furchi, M. M., Pospischil, A., Libisch, F., Burgdorfer, J. & Mueller, T. Photovoltaic effect in an electrically tunable van der Waals heterojunction. Nano Lett. 14, 4785-4791 (2014).
33. Cheng, R. et al. Electroluminescence and photocurrent generation from atomically sharp WSe2/MoS2 heterojunction p-n diodes. Nano Lett. 14, 5590-5597 (2014).
34. Fang, H. et al. Strong interlayer coupling in van der Waals heterostructures built from single-layer chalcogenides. Proc. Natl Acad. Sci. USA 111, 6198-6202 (2014).