Speaker | Samaneh Ataei |
Affiliation | Department of Physics, Shahid Beheshti University, Tehran, Iran |
Date | 2022-06-07 |
Time | 10:00 |
Venue | On-site: S3 Seminar Room – Physics Build. 3rd floor
On-line: https://meet.goto.com/325487141
|
Host | Daniele Varsano |
On-site: S3 Seminar Room - Third Floor - Physics Building
please note: there is a limited number of seats available, therefore the attendance is subject to availability on a “first come first serve” basis.
On-line: https://meet.goto.com/325487141
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Gate induced carriers impact the many-body interactions in monolayer transition metal dichalcogenides (TMDs) by modifying the screened Coulomb potential and renormalizing the band gap, thus influencing the strong excitonic effects in these materials. Using the GW approximation and a plasmon pole theory to model the carrier induced plasmons in the frequency-dependent part of the screening, we accurately calculate the band gap renormalization of the electron doped monolayer MoS2 and WS2. The excitonic states of the low doped systems are calculated by solving the Bethe-Salpeter equation. Our results clarify the competition between screening and band gap renormalization. An exact cancellation occurs between the reduced band gap and the exciton binding energy for doped monolayer WS2, in good agreement with previous experimental results. In contrast, the exciton energy of doped monolayer MoS2 blueshifts by tens of meV. We show the role of the electronic band structure of the monolayers in the calculated exciton energies. Our results could be generally expanded to other monolayer TMDs and are helpful for quantitatively engineering optoelectronic devices with desired features.
Istituto Nanoscienze
Consiglio Nazionale delle Ricerche
PEC: protocollo.nano@pec.cnr.it
Partita IVA 02118311006
Piazza San Silvestro 12
56127 Pisa, Italy
phone +39 050 509418
fax +39 050 509550
Istituto Nanoscienze Consiglio Nazionale delle Ricerche
Piazza San Silvestro 12, I
56127 Pisa
phone +39 050 509525/418
fax +39 050 509550
via Campi 213/A, I
41125 Modena 7
phone +39 059 2055629
fax +39 059 2055651″
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