Time- and angle-resolved photoemission spectroscopy (TR-ARPES) of TMDC monolayers and bilayers

Liu, Fang

doi:10.1039/d2sc04124c

Cited by 7 publications

(5 citation statements)

References 145 publications

(215 reference statements)

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“…Thus, this behavior is identical to what occurs in all pump-probe experiments that have used other non-optical probing techniques such as time-and angle-resolved photoemission spectroscopy [TrARPES, also known as two-photon photoemission spectroscopy (2PPES)] [ [14][15][16][17][18][19][20][21][22][23], time-resolved x-ray diffraction [41,42] and time-resolved conductivity [43]. Although all probing methods reflect the influence of pump-excited carriers on semiconductor properties, only 2PPES and one-photonpumped TA spectroscopy (1PPTAS) allow one to study the evolution of the electron energy distribution function (EDF) during the relaxation process [14][15][16][17][18][19][20][21][22][23]37]. In addition to elucidating the carrier cooling mechanism, EDF also provides valuable information about the possible states of carriers in semiconductor devices.…”

Section: Introductionsupporting

confidence: 62%

“…Specifically, the combination of angular and time resolution in 2PPES allows one to study the time evolution of EDF for a population of photoexcited electrons in the conduction band relative to their crystal momentum. Using this method, the dynamics of photoexcited electrons in the conduction band of 2D materials have been studied [14][15][16][17][18][19][20][21][22][23].…”

Section: The Basic Concepts Of Multiphoton-pumped Uv-vis Ta Spectroscopymentioning

confidence: 99%

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Multiphoton-pumped UV-Vis transient absorption spectroscopy of 2D materials: basic concepts and recent applications

Glinka

2024

J. Phys.: Condens. Matter

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2D materials are considered a key element in the development of next-generation electronics (nanoelectronics) due to their extreme thickness in the nanometer range and unique physical properties. The ultrafast dynamics of photoexcited carriers in such materials are strongly influenced by their interfaces, since the thickness of 2D materials is much smaller than the typical depth of light penetration into their bulk counterparts and the mean free path of photoexcited carriers. The resulting collisions of photoexcited carriers with interfacial potential barriers of 2D materials in the presence of a strong laser field significantly alter the overall dynamics of photoexcitation, allowing laser light to be directly absorbed by carriers in the conduction/valence band through the inverse bremsstrahlung mechanism. The corresponding ultrafast carrier dynamics can be monitored using multiphoton-pumped UV-Vis transient absorption spectroscopy. In this review, we discuss the basic concepts and recent applications of this spectroscopy for a variety of 2D materials, including transition-metal dichalcogenide monolayers, topological insulators, and other 2D semiconductor structures.

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Section: Introductionsupporting

confidence: 62%

Section: The Basic Concepts Of Multiphoton-pumped Uv-vis Ta Spectroscopymentioning

confidence: 99%

Multiphoton-pumped UV-Vis transient absorption spectroscopy of 2D materials: basic concepts and recent applications

Glinka

2024

J. Phys.: Condens. Matter

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“…In addition, ultrafast carrier dynamics and excitonic effects have recently been investigated using the tr-ARPES technique [438]. These include graphene [439][440][441][442][443], BP [444][445][446][447], Bi 2 Se 3 [263,[448][449][450][451][452][453][454][455][456], TMDCs [5,278,[457][458][459][460][461][462][463][464][465] and 2D CDW TaS 2 [105,110,[466][467][468][469] systems.…”

Section: Two-dimensional Materialsmentioning

confidence: 99%

“…In this review, we focus on arguably the most significant innovations in the field of photoemission from a rather technical perspective. More specialized reviews of ARPES studies of quantum materials can be found in [5][6][7][8][9]. The manuscript is organized as follows: First, we provide a brief introduction to the fundamental theory of the photoemission process, discuss experimental matters connected to photon energy, and reflect on sample requirements.…”

Section: Introductionmentioning

confidence: 99%

Recent progress in angle-resolved photoemission spectroscopy

Wang,

Dendzik

2024

Meas. Sci. Technol.

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Angle-resolved photoemission spectroscopy (ARPES) is a well-established experimental technique that allows probing of the electronic structure of quantum materials using relatively high-energy photons. ARPES has been extensively used to study important classes of materials such as topological insulators, high-temperature superconductors, two-dimensional materials or interface systems. Although the technique was originally developed over 60 years ago, the last decade has witnessed significant advancements in instrumentation. In this review, we survey recent progress in ARPES, with a focus on developments in novel light sources and electron detection methods, which enable the expansion of ARPES into spin-, time-, or space-resolved domains. Important examples of ARPES results are presented, together with an outlook for the field.

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“…In many regards, QSR is akin to the renormalization of the band-edge states characterized in the monolayer transition metal dichalcogenides (TMDCs). − Time- and angle-resolved photoemission spectroscopy experiments performed on room-temperature monolayer MoS 2 directly probed the electronic structure renormalization induced with low excitation fluences. , The band-edge states of the MoS 2 sample were observed to shift by ∼40 meV to higher energies at the K point, k = −1.29(1) Å –1 , upon photoexcitation with low fluences, followed by a recovery within 5.0(1.8) ps. The excitation energy at the K valley edge, k = −1.14(1) Å –1 , was observed to decrease by ∼100 meV, and this perturbation remained for much longer than that at the K point.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Quantum-State Renormalization and Effects of Competing Pathways on Carrier Relaxation in Semiconductor Nanoparticles

Chen,

Sanderson,

Loomis

2023

J. Phys. Chem. C

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The magnitude and temporal evolution of the quantum-state renormalization (QSR), or the energetic shifting of the quantum-confinement states caused by photoexcitation and changes in electron screening, were probed in transient absorption (TA) spectroscopy measurements of colloidal semiconductor nanoparticles. Experiments were performed on high- and lower-quality wurtzite CdTe quantum wires (QWs) with photoluminescence quantum yields of 8.8% and ∼0.2% using low-excitation fluences. The QSR shifts the spectral features to lower energies in both samples, with larger shifts measured in the high-quality QWs. The TA spectral features measured for both samples shift uniquely with time after photoexcitation, illustrating dynamic QSR that depends on the quantum-confinement states and on the states occupied by carriers. The higher fraction of carriers that reach the band-edge states in the high-quality QWs results in larger renormalization, with the energies of the band-edge states approaching the Stokes shift of the steady-state photoluminescence feature below the band-edge absorption energy. The intraband relaxation dynamics of charge carriers photoexcited in semiconductor nanoparticles was also characterized after accounting for contributions from QSR in the TA data. The intraband relaxation to the band-edge states was slower in the high-quality QWs than in the lower-quality QWs, likely due to the reduced number of trap states accessible. The contrasting relaxation time scales provide definitive evidence for a dependence of the photoluminescence efficiency on excitation energy. These studies reveal the complicated interplay between the energetics and relaxation mechanisms of carriers within semiconductor nanoparticles, even those with the same dimensionality.

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Time- and angle-resolved photoemission spectroscopy (TR-ARPES) of TMDC monolayers and bilayers

Abstract: Many unique properties in two-dimensional (2D) materials and their heterostructures rely on charge excitation, scattering, transfer and relaxation dynamics across different points in the momentum space. Understanding of these dynamics...

Cited by 7 publications

References 145 publications

Multiphoton-pumped UV-Vis transient absorption spectroscopy of 2D materials: basic concepts and recent applications

Multiphoton-pumped UV-Vis transient absorption spectroscopy of 2D materials: basic concepts and recent applications

Recent progress in angle-resolved photoemission spectroscopy

Dynamic Quantum-State Renormalization and Effects of Competing Pathways on Carrier Relaxation in Semiconductor Nanoparticles

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