Resonantly excited exciton dynamics in two-dimensional MoSe2 monolayers

نویسندگان

  • L. Scarpelli
  • F. Masia
  • E. M. Alexeev
  • F. Withers
  • A. I. Tartakovskii
  • K. S. Novoselov
  • W. Langbein
چکیده

L. Scarpelli, F. Masia, E.M. Alexeev, F. Withers, A.I. Tartakovskii, K.S. Novoselov, and W. Langbein School of Physics and Astronomy, Cardiff University, The Parade, Cardiff CF24 3AA, United Kingdom Department of Physics and Astronomy, University of Sheffield, Hounsfield Rd, Sheffield S3 7RH, United Kingdom College of Engineering, Mathematics and Physical Sciences, University of Exeter, North Park Rd, Exeter EX4 4QF United Kingdom School of Physics and Astronomy, University of Manchester, Oxford Rd, Manchester M13 9PL, United Kingdom (Dated: April 18, 2017)

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Ultrafast charge separation and indirect exciton formation in a MoS2-MoSe2 van der Waals heterostructure.

We observe subpicosecond charge separation and formation of indirect excitons a van der Waals heterostructure formed by molybdenum disulfide and molybdenum diselenide monolayers. The sample is fabricated by manually stacking monolayer MoS2 and MoSe2 flakes prepared by mechanical exfoliation. Photoluminescence measurements confirm the formation of an effective heterojunction. In the transient ab...

متن کامل

Polarization and time-resolved photoluminescence spectroscopy of excitons in MoSe2 monolayers

We investigate valley exciton dynamics in MoSe2 monolayers in polarizationand time-resolved photoluminescence (PL) spectroscopy at 4K. Following circularly polarized laser excitation, we record a low circular polarization degree of the PL of typically ≤ 5%. This is about 10 times lower than the polarization induced under comparable conditions in MoS2 and WSe2 monolayers. The evolution of the ex...

متن کامل

Exciton formation in monolayer transition metal dichalcogenides.

Two-dimensional transition metal dichalcogenides provide a unique platform to study excitons in confined structures. Recently, several important aspects of excitons in these materials have been investigated in detail. However, the formation process of excitons from free carriers has yet to be understood. Here we report time-resolved measurements on the exciton formation process in monolayer sam...

متن کامل

Tightly Bound Trions in Transition Metal Dichalcogenide Heterostructures.

We report the observation of trions at room temperature in a van der Waals heterostructure composed of MoSe2 and WS2 monolayers. These trions are formed by excitons excited in the WS2 layer and electrons transferred from the MoSe2 layer. Recombination of trions results in a peak in the photoluminescence spectra, which is absent in monolayer WS2 that is not in contact with MoSe2. The trion origi...

متن کامل

Radiatively Limited Dephasing and Exciton Dynamics in MoSe2 Monolayers Revealed with Four-Wave Mixing Microscopy

By implementing four-wave mixing (FWM) microspectroscopy, we measure coherence and population dynamics of the exciton transitions in monolayers of MoSe2. We reveal their dephasing times T2 and radiative lifetime T1 in a subpicosecond (ps) range, approaching T2 = 2T1 and thus indicating radiatively limited dephasing at a temperature of 6 K. We elucidate the dephasing mechanisms by varying the te...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2017