Zobrazeno 1 - 10
of 50
pro vyhledávání: '"E.G. Kavousanaki"'
Publikováno v:
Physical Review B. 97
Graphene quantum dots (GQD's) have optical properties which are very different from those of an extended graphene sheet. In this Article we explore how the size, shape and edge--structure of a GQD affect its optical conductivity. Using representation
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a6648c6a8d50c7bce39ac88a9eb9809b
https://doi.org/10.1103/physrevb.97.115404
https://doi.org/10.1103/physrevb.97.115404
Autor:
E.G. Kavousanaki, Keshav M. Dani
Publikováno v:
Physical Review B. 91
Using the tight-binding model, we classify the eigenstates of symmetric graphene quantum dots based on their discrete rotational symmetry. In the presence of an external magnetic field, we identify a Zeeman-like behavior arising from the electronic o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6b568b445f9992db3e8065b6d71883aa
https://doi.org/10.1103/physrevb.91.035433
https://doi.org/10.1103/physrevb.91.035433
Publikováno v:
physica status solidi (b). 243:2397-2404
We present a many-body theory of the non-linear optical response of the Quantum Hall system. This theory describes the role of the cold, strongly correlated, two-dimensional electron gas (2DEG) in the ultrafast dynamics. We discuss the manifestations
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::17768649ccfa9fcd6b71432c9255342a
https://doi.org/10.1002/pssb.200668076
https://doi.org/10.1002/pssb.200668076
Autor:
Jérôme Tignon, Ilias E. Perakis, Daniel S. Chemla, M. Breit, Keshav M. Dani, E.G. Kavousanaki
Publikováno v:
Physica E: Low-dimensional Systems and Nanostructures. 34:206-209
Using the non linear optical technique of 3-pulse 4-wave mixing, we study the dynamics of the collective excitations of the quantum Hall system. We excite the system with 100 fs pulses propagating in directions k 1 and k 3 and then probe its time evo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::65403e217204305e07f5fd323989850e
https://doi.org/10.1016/j.physe.2006.03.113
https://doi.org/10.1016/j.physe.2006.03.113
Publikováno v:
physica status solidi c. 3:2410-2413
We develop a theory of photoinduced dynamical magnetic effects in III-Mn-V ferromagnetic semiconductors valid in presence of strong carrier spin relaxation and dephasing. We treat relaxation by using the Lindblad semigroup method and calculate the no
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::de6568529220b1362ec03c6826bf4546
https://doi.org/10.1002/pssc.200668020
https://doi.org/10.1002/pssc.200668020
Autor:
E.G. Kavousanaki, Keshav M. Dani, Ilias E. Perakis, M. Breit, Daniel S. Chemla, Jérôme Tignon
Στην παρούσα διατριβή μελετάμε μία θεωρία για την υπερταχή μη γραμμική οπτική απόκριση του κβαντικού συστήματος Hall. Η θεωρία μας επικεν
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e5e76248675466ae2ea29702efaa5c60
https://doi.org/10.12681/eadd/20494
https://doi.org/10.12681/eadd/20494
Publikováno v:
Physical Review B. 82
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7c0e7fcb9cd36f962f27aff6dc16d055
https://doi.org/10.1103/physrevb.82.165313
https://doi.org/10.1103/physrevb.82.165313
Autor:
Jérôme Tignon, E.G. Kavousanaki, Ingrid Cotoros, Keshav Dani, Jigang Wang, Ilias E. Perakis, Daniel S. Chemla
Publikováno v:
Ultrafast Phenomena XV ISBN: 9783540687795
In three-pulse four-wave mixing experiments of undoped GaAs quantum wells in large perpendicular magnetic fields, we see a small signal with unexpectedly long-lived beats. Using a microscopic many-body theory, we identify the beats as due to non-radi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cec2b0de22c99868c184975207997e42
https://doi.org/10.1007/978-3-540-68781-8_222
https://doi.org/10.1007/978-3-540-68781-8_222
We review recent investigations of the femtosecond non-linear optical response of the two-dimensional electron gas (2DEG) in a strong magnetic field. We probe the Quantum Hall (QH) regime for filling factors $\nu \sim 1$. Our focus is on the transien
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::401e3192d635b18c0a6afe18256bcde5
http://arxiv.org/abs/cond-mat/0607550
http://arxiv.org/abs/cond-mat/0607550
Publikováno v:
2006 Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference.
Using 3-pulse four-wave mixing spectroscopy we excite an intra-band coherence of the coupled light - quantum Hall system and probe its early dynamics. Many-body theory elucidates the non-instantaneous interactions between photoexcited carriers and ma
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bd11786c3c7aee66b9e7e3ca68d68a08
https://doi.org/10.1109/cleo.2006.4629012
https://doi.org/10.1109/cleo.2006.4629012