Control of the Exciton Radiative Lifetime in van der Waals Heterostructures

H. H. Fang, B. Han, C. Robert, M. A. Semina, D. Lagarde, E. Courtade, T. Taniguchi, K. Watanabe, T. Amand, B. Urbaszek, M. M. Glazov, X. Marie

Research output

Abstract

Optical properties of atomically thin transition metal dichalcogenides are controlled by robust excitons characterized by a very large oscillator strengths. Encapsulation of monolayers such as MoSe2 in hexagonal boron nitride (hBN) yields narrow optical transitions approaching the homogenous exciton linewidth. We demonstrate that the exciton radiative rate in these van der Waals heterostructures can be tailored by a simple change of the hBN encapsulation layer thickness as a consequence of the Purcell effect. The time-resolved photoluminescence measurements show that the neutral exciton spontaneous emission time can be tuned by one order of magnitude depending on the thickness of the surrounding hBN layers. The inhibition of the radiative recombination can yield spontaneous emission time up to 10 ps. These results are in very good agreement with the calculated recombination rate in the weak exciton-photon coupling regime. The analysis shows that we are also able to observe a sizable enhancement of the exciton radiative decay rate. Understanding the role of these electrodynamical effects allows us to elucidate the complex dynamics of relaxation and recombination for both neutral and charged excitons.

Original languageEnglish
Article number067401
Number of pages6
JournalPhysical Review Letters
Volume123
Issue number6
DOIs
Publication statusPublished - 5 Aug 2019

Fingerprint

radiative lifetime
excitons
boron nitrides
spontaneous emission
radiative recombination
optical transition
oscillator strengths
decay rates
transition metals
photoluminescence
optical properties
augmentation
photons

Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Fang, H. H., Han, B., Robert, C., Semina, M. A., Lagarde, D., Courtade, E., ... Marie, X. (2019). Control of the Exciton Radiative Lifetime in van der Waals Heterostructures. Physical Review Letters, 123(6), [067401]. https://doi.org/10.1103/PhysRevLett.123.067401
Fang, H. H. ; Han, B. ; Robert, C. ; Semina, M. A. ; Lagarde, D. ; Courtade, E. ; Taniguchi, T. ; Watanabe, K. ; Amand, T. ; Urbaszek, B. ; Glazov, M. M. ; Marie, X. / Control of the Exciton Radiative Lifetime in van der Waals Heterostructures. In: Physical Review Letters. 2019 ; Vol. 123, No. 6.
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Fang, HH, Han, B, Robert, C, Semina, MA, Lagarde, D, Courtade, E, Taniguchi, T, Watanabe, K, Amand, T, Urbaszek, B, Glazov, MM & Marie, X 2019, 'Control of the Exciton Radiative Lifetime in van der Waals Heterostructures', Physical Review Letters, vol. 123, no. 6, 067401. https://doi.org/10.1103/PhysRevLett.123.067401

Control of the Exciton Radiative Lifetime in van der Waals Heterostructures. / Fang, H. H.; Han, B.; Robert, C.; Semina, M. A.; Lagarde, D.; Courtade, E.; Taniguchi, T.; Watanabe, K.; Amand, T.; Urbaszek, B.; Glazov, M. M.; Marie, X.

In: Physical Review Letters, Vol. 123, No. 6, 067401, 05.08.2019.

Research output

TY - JOUR

T1 - Control of the Exciton Radiative Lifetime in van der Waals Heterostructures

AU - Fang, H. H.

AU - Han, B.

AU - Robert, C.

AU - Semina, M. A.

AU - Lagarde, D.

AU - Courtade, E.

AU - Taniguchi, T.

AU - Watanabe, K.

AU - Amand, T.

AU - Urbaszek, B.

AU - Glazov, M. M.

AU - Marie, X.

PY - 2019/8/5

Y1 - 2019/8/5

N2 - Optical properties of atomically thin transition metal dichalcogenides are controlled by robust excitons characterized by a very large oscillator strengths. Encapsulation of monolayers such as MoSe2 in hexagonal boron nitride (hBN) yields narrow optical transitions approaching the homogenous exciton linewidth. We demonstrate that the exciton radiative rate in these van der Waals heterostructures can be tailored by a simple change of the hBN encapsulation layer thickness as a consequence of the Purcell effect. The time-resolved photoluminescence measurements show that the neutral exciton spontaneous emission time can be tuned by one order of magnitude depending on the thickness of the surrounding hBN layers. The inhibition of the radiative recombination can yield spontaneous emission time up to 10 ps. These results are in very good agreement with the calculated recombination rate in the weak exciton-photon coupling regime. The analysis shows that we are also able to observe a sizable enhancement of the exciton radiative decay rate. Understanding the role of these electrodynamical effects allows us to elucidate the complex dynamics of relaxation and recombination for both neutral and charged excitons.

AB - Optical properties of atomically thin transition metal dichalcogenides are controlled by robust excitons characterized by a very large oscillator strengths. Encapsulation of monolayers such as MoSe2 in hexagonal boron nitride (hBN) yields narrow optical transitions approaching the homogenous exciton linewidth. We demonstrate that the exciton radiative rate in these van der Waals heterostructures can be tailored by a simple change of the hBN encapsulation layer thickness as a consequence of the Purcell effect. The time-resolved photoluminescence measurements show that the neutral exciton spontaneous emission time can be tuned by one order of magnitude depending on the thickness of the surrounding hBN layers. The inhibition of the radiative recombination can yield spontaneous emission time up to 10 ps. These results are in very good agreement with the calculated recombination rate in the weak exciton-photon coupling regime. The analysis shows that we are also able to observe a sizable enhancement of the exciton radiative decay rate. Understanding the role of these electrodynamical effects allows us to elucidate the complex dynamics of relaxation and recombination for both neutral and charged excitons.

KW - SPONTANEOUS EMISSION

KW - 2-DIMENSIONAL MATERIALS

KW - ROOM-TEMPERATURE

KW - ENHANCEMENT

KW - INHIBITION

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U2 - 10.1103/PhysRevLett.123.067401

DO - 10.1103/PhysRevLett.123.067401

M3 - статья

C2 - 31491178

AN - SCOPUS:85070543177

VL - 123

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 6

M1 - 067401

ER -

Fang HH, Han B, Robert C, Semina MA, Lagarde D, Courtade E et al. Control of the Exciton Radiative Lifetime in van der Waals Heterostructures. Physical Review Letters. 2019 Aug 5;123(6). 067401. https://doi.org/10.1103/PhysRevLett.123.067401