Transient three-pulse four-wave mixing spectra of magnetoexcitons coupled with an incompressible quantum liquid

Karadimitriou, M. E.; Kavousanaki, Eleftheria; Perakis, I. E.; Dani, Keshav M.

doi:10.1103/physrevb.82.165313

Cited by 9 publications

(32 citation statements)

References 93 publications

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“…The dephasing of interband photoexcited carriers (for which Kohn's theorem does not apply) is strongly dependent on the filling factor, presumably due to the electron-electron interactions within a Landau level. 28,29 In contrast, in the present intraband excitation experiments, no obvious filling-factor dependence was observed, which implies that dephasing due to electron-electron interactions is also prohibited by Kohn's theorem.…”

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confidence: 87%

Quantum control of a Landau-quantized two-dimensional electron gas in a GaAs quantum well using coherent terahertz pulses

et al. 2011

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We demonstrate coherent control of cyclotron resonance in a two-dimensional electron gas (2DEG). We use a sequence of terahertz (THz) pulses to control the amplitude of coherent cyclotron resonance oscillations in an arbitrary fashion via phase-dependent coherent interactions. We observe a self-interaction effect, where the 2DEG interacts with the THz field emitted by itself within the decoherence time, resulting in a revival and collapse of quantum coherence. These observations are accurately describable using single-particle optical Bloch equations, showing no signatures of electron-electron interactions, which verifies the validity of Kohn's theorem for cyclotron resonance in the coherent regime.

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confidence: 87%

Quantum control of a Landau-quantized two-dimensional electron gas in a GaAs quantum well using coherent terahertz pulses

et al. 2011

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“…The two-dimensional Landau level spectra show full widths at half maximum below 1 meV along the ω t frequency in the 2DFT spectra, but much larger and elongated lineshapes along the ω τ frequency [45,51,52,61]. Furthermore, the two Landau levels shown at 10 Tesla reveal strong quantum coherent coupling between them, as indicated by the cross-diagonal peaks marked by the red dashed circles [70,71].…”

Section: Resultsmentioning

confidence: 92%

“…Between 4 and 5 Tesla only LL1 is populated and shifts toward higher energy with increasing magnetic field. At higher magnetic fields starting at 8 Tesla, only the lowest Landau level LL0 is populated [70,71]. The polarization dependence of LL1 and LL0 is shown in Fig.…”

Section: Figmentioning

confidence: 93%

Coulomb-interaction induced coupling of Landau levels in intrinsic and modulation-doped quantum wells

et al. 2017

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We have performed two-dimensional Fourier transform spectroscopy on intrinsic and modulation doped quantum wells in external magnetic fields up to 10 Tesla. In the undoped sample, the strong Coulomb interactions and the increasing separations of the electron and hole charge distributions with increasing magnetic fields lead to a non-trivial in-plane dispersion of the magneto-excitons. Thus, the discrete and degenerate Landau levels are coupled to a continuum. The signature of this continuum is the emergence of elongated spectral line shapes at the Landau level energies, which are exposed by the multidimensional nature of our technique. Surprisingly, the elongation of the peaks is completely absent in the lowest Landau level spectra obtained from the modulation doped quantum well at high fields.

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“…The theories describing the nonlinear response of undoped semiconductors must be extended to describe such effects. [68,18,19,20,21] For example, the DCTS truncates the hierarchy of density matrices generated by the interactions based on the assumption that all Coulomb interactions occur between photoexcited e-h pairs. The standard diagrammatic expansions and DCTS factorizations assume a Hartree-Fock reference state and no free ground state carriers.…”

Section: Ch1mentioning

confidence: 99%

“…We consider a two-band Hamiltonian describing two-dimensional electrons and holes subject to a perpendicular magnetic field. [21]. We also consider right-circularly polarized light, which excites a single interband transition that creates spin-↓ electrons and results in a single LL0 peak.…”

Section: Description Of the Modelmentioning

confidence: 99%

Ultrafast dynamical properties of strongly interacting systems under nonlinear coherent photoexcitation by multiple ultrashort laser pulses

Karadimitriou¹,

Καραδημητρίου²

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Στην παρούσα διδακτορική διατριβή παρουσιάζουμε μια θεωρία πολλών σωμάτων για την υπερταχή μη γραμμική οπτική απόκριση σε ημιαγωγούς και συστήματα με υψηλά συσχετισμένη θεμελιώδη κατάσταση, όπως το κβαντικό σύστημα Hall (QHS). Η θεωρία μας βασίζεται σε μια κατάτμηση των εξισώσεων κίνησης του τελεστή πυκνότητα, απουσία μιας μικρής παραμέτρου αλληλεπίδρασης που λαμβάνεται υπόψη για να αναπτύξουμε σε όρους του οπτικού πεδίου, και με τη χρήση τελεστών Hubbard με στόχο να περιγράψουμε την ακριβή δυναμική του συστήματος, μέσω ενός κβαντικού υπόχωρου καταστάσεων πολλών σωματιδίων. Στην χρονική κλίμακα των femptosecond και picosecond προσδιορίζουμε το “αποτύπωμα” των μη στιγμιαίων αλληλεπιδράσεων μεταξύ των μαγνητο-εξιτονίων (X) και του ασυμπίεστου δισδιάστατου ηλεκτρονιακού αερίου (2ΔΗΑ) , που περιγράφονται από την σύζευξη των μαγνητο-εξιτονίων ανάμεσα σε δύο επίπεδα Landau με τις συλλογικές διεγέρσεις του ηλεκτρονιακού αερίου (magnetoroton (MR) και magnetoplasmon (MP)). Δείχνουμε ότι η ισχυρή σύζευξη με τις παραπάνω διεγέρσεις αλλάζει τη διαχρονική εξέλιξη των μη γραμμικών οπτικών φασμάτων σε σύγκριση με την “Προσέγγιση τυχαίων φάσεων” (RPA) και οδηγεί σε συντονισμό απορρόφησης. Υπολογίζουμε το “τριών παλμών” FWM (Four Wave Mixing) σήμα, του οποίου η εξάρτηση από τις χρονικές καθυστερήσεις ανάμεσα στους παλμούς αντικατοπτρίζει την απώλεια φάσης και την χαλάρωση του έντονα συσχετισμένου συστήματος X - 2ΔΗΑ. Τα παραπάνω αποδεικνύουν ότι η δυναμική της αλληλεπίδρασης X - 2ΔΗΑ μπορεί να επιλυθεί με femtosecond οπτικούς παλμούς. Τα αποτελέσματά μας ρίχνουν φως σε ανεξερεύνητες sub-picosecond περιοχές του QHS και μπορούν να χρησιμοποιηθούν για να ερμηνεύσουν πειράματα δισδιάστατης φασματοσκοπίας συσχετισμένων συστημάτων.

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Transient three-pulse four-wave mixing spectra of magnetoexcitons coupled with an incompressible quantum liquid

Cited by 9 publications

References 93 publications

Quantum control of a Landau-quantized two-dimensional electron gas in a GaAs quantum well using coherent terahertz pulses

Quantum control of a Landau-quantized two-dimensional electron gas in a GaAs quantum well using coherent terahertz pulses

Coulomb-interaction induced coupling of Landau levels in intrinsic and modulation-doped quantum wells

Ultrafast dynamical properties of strongly interacting systems under nonlinear coherent photoexcitation by multiple ultrashort laser pulses

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