Results 31 to 40 of about 103,476 (250)

Exciton-exciton interaction in transition-metal dichalcogenide monolayers [PDF]

, 2017
We study theoretically the Coulomb interaction between excitons in transition metal dichalcogenide (TMD) monolayers. We calculate direct and exchange interaction for both ground and excited states of excitons.
Iorsh, I., Kyriienko, O., Shahnazaryan, V., Shelykh, I. A.   +3 more
core   +2 more sources

Excitons dressed by a sea of excitons [PDF]

The European Physical Journal B, 2004
We here consider an exciton $i$ embedded in a sea of $N$ identical excitons 0. If the excitons are bosonized, a bosonic enhancement factor, proportional to $N$, is found for $i=0$. If the exciton composite nature is kept, this enhancement not only exists for $i=0$, but also for any exciton having a center of mass momentum equal to the sea exciton ...
Betbeder-Matibet, Odile, Combescot, Monique   +1 more
openaire   +2 more sources

Many-body effects in nonlinear optical responses of 2D layered semiconductors [PDF]

, 2016
We performed ultrafast degenerate pump-probe spectroscopy on monolayer WSe2 near its exciton resonance. The observed differential reflectance signals exhibit signatures of strong many-body interactions including the exciton-exciton interaction and free ...
Aivazian, Grant, Cobden, David, Mandrus, David G., Wu, Sanfeng, Xu, Xiaodong, Yan, Jiaqiang, Yao, Wang, Yu, Hongyi   +7 more
core   +2 more sources

Device-spectroscopy of magnetic field effects in a polyfluorene organic light-emitting diode

, 2007
We perform charge-induced absorption and electroluminescence spectroscopy in a polyfluorene organic magnetoresistive device. Our experiments allow us to measure the singlet exciton, triplet exciton and polaron densities in a live device under an applied ...
B. Movaghar, J. Rybicki, M. Wohlgenannt, T. D. Nguyen, U. E. Steiner, Y. Sheng, Z. V. Vardeny   +6 more
core   +1 more source

Intrinsic electric field effects on few-particle interactions in coupled GaN quantum dots [PDF]

, 2004
We study the multi-exciton optical spectrum of vertically coupled GaN/AlN quantum dots with a realistic three-dimensional direct-diagonalization approach for the description of few-particle Coulomb-correlated states. We present a detailed analysis of the
D. Bimberg, F. Rossi, G. Bastard, I. D’Amico, K. Tachibana, L. Jacak, P. Y. Yu, S. De Rinaldis   +7 more
core   +2 more sources

Simulation of Solvatochromic Phenomena in Xanthione Using Explicit Solvent Methods

Molecules
Xanthione is a sulfated polycyclic aromatic hydrocarbon which exhibits unique anti-Kasha properties and substantial sensitivity to its medium. Due to this sensitivity however, this makes xanthione-based systems very difficult to simulate.
Anjay Manian, Zifei Chen, Rohan J. Hudson, Salvy P. Russo   +3 more
doaj   +1 more source

Ultrafast Coulomb-induced dynamics of 2D magnetoexcitons

, 2000
We study theoretically the ultrafast nonlinear optical response of quantum well excitons in a perpendicular magnetic field. We show that for magnetoexcitons confined to the lowest Landau levels, the third-order four-wave-mixing (FWM) polarization is ...
B. F. Feuerbacher, C. Sieh, C. Stafford, D. J. Lovering, D. Paquet, D. S. Chemla, D. S. Chemla, E. J. Mayer, E. J. Mayer, E. Tsitsishvili, F. C. Spano, G. M. Kavoulakis, H. Haug, H. Wang, H. Wang, H. Zhou, I. Balslev, I. E. Perakis, I. E. Perakis, I. E. Perakis, I. E. Perakis, I. E. Perakis, I. V. Lerner, J. A. Leegwater, J. B. Stark, J. Shah, J.-Y. Bigot, K. Bott, K. Leo, K. Victor, K.-H. Pantke, M. Jiang, M. Lindberg, M. Lindberg, M. Lindberg, M. Lindberg, M. Wegener, N. A. Fromer, N. Primozich, N. Primozich, O. Carmel, P. Kner, P. Kner, P. Kner, R. Binder, S. Bar-Ad, S. Glutsch, S. Glutsch, S. Mukamel, S. Schmitt-Rink, S. Schmitt-Rink, S. Schmitt-Rink, S. T. Cundiff, S. Weiss, S. Yokojima, T. Aoki, T. Rappen, T. Rappen, T. V. Shahbazyan, T. V. Shahbazyan, T. Yajima, Th. Östreich, Th. Östreich, Th. Östreich, U. Siegner, U. Siegner, V. Chernyak, V. Chernyak, V. M. Axt, V. M. Axt, V. M. Axt, V. M. Axt, W. Schäfer, Y. Z. Hu, Yu. A. Bychkov   +74 more
core   +2 more sources

Time-dependent density-functional theory of exciton-exciton correlations in the nonlinear optical response [PDF]

, 2013
We analyze possible nonlinear exciton-exciton correlation effects in the optical response of semiconductors by using a time-dependent density-functional theory (TDDFT) approach.
Leuenberger, Michael N., Turkowski, Volodymyr   +1 more
core   +3 more sources

Exciton-exciton transitions involving strongly bound excitons: An ab initio approach

Physical Review B, 2023
In pump-probe spectroscopy, two laser pulses are employed to garner dynamical information from the sample of interest. The pump initiates the optical process by exciting a portion of the sample from the electronic ground state to an accessible electronic excited state, an exciton. Thereafter, the probe interacts with the already excited sample.
D. Sangalli, M. D'Alessandro, C. Attaccalite   +2 more
openaire   +4 more sources

Calculating curly arrows from ab initio wavefunctions

Nature Communications, 2018
Despite being essential to organic chemistry, the curly arrow notation of reaction mechanisms has been treated with suspicion due to its unclear connection with quantum mechanics.
Yu Liu, Philip Kilby, Terry J. Frankcombe, Timothy W. Schmidt   +3 more
doaj   +1 more source