Coupled Collective and Rabi Oscillations Triggered by Electron Transport through a Photon Cavity

Guðmundsson, Viðar; Sitek, Anna; Lin, Pei-Yi; Abdullah, Nzar Rauf; Tang, Chi-Shung; Manolescu, Andrei

doi:10.1021/acsphotonics.5b00115

Cited by 19 publications

(29 citation statements)

References 24 publications

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“…The charge occupations display few Rabi oscillations on their way to the steady-state. Similar oscillations of the transient current were reported for a continuous model 37 .…”

Section: A Removal Of the Coulomb Blockadesupporting

confidence: 83%

Backaction effects in cavity-coupled quantum conductors

et al. 2019

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We study the electronic transport through a pair of distant nanosystems (Sa and S b ) embedded in a single-mode cavity. Each system is connected to source and drain particle reservoirs and the electron-photon coupling is described by the Tavis-Cummings model. The generalized master equation approach provides the reduced density operator of the double-system in the dressed-states basis. It is shown that the photon-mediated coupling between the two subsystems leaves a signature on their transient and steady-state currents. In particular, a suitable bias applied on subsystem S b induces a photon-assisted current in the other subsystem Sa which is otherwise in the Coulomb blockade. We also predict that a transient current passing through one subsystem triggers a charge transfer between the optically active levels of the second subsystem even if the latter is not connected to the leads. As a result of back-action, the transient current through the open system develops Rabi oscillations (ROs) whose period depends on the initial state of the closed system.

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“…The charge occupations display few Rabi oscillations on their way to the steady-state. Similar oscillations of the transient current were reported for a continuous model 37 .…”

Section: A Removal Of the Coulomb Blockadesupporting

confidence: 83%

Backaction effects in cavity-coupled quantum conductors

et al. 2019

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“…shows that this photon energy is not close to a resonance for any one‐electron state for the case of x ‐polarization, but close to a resonance for the one‐electron ground state

| \overset{˘}{1})

bound in the dots and the one‐electron state

| \overset{˘}{3})

just above the dots in the case of y ‐polarization. This can be seen by the fact that the mean photon number for

| \overset{˘}{3})

and

| \overset{˘}{5})

and their opposite spin counterparts is not close to an integer, reflecting a Rabi‐splitting and entanglement . The resulting extra polarizability of the one‐electron states for the y ‐polarized photon field is not seen for the low energy 2‐electron states.…”

Section: Closed Systemmentioning

confidence: 99%

Cavity‐photon contribution to the effective interaction of electrons in parallel quantum dots

et al. 2015

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A single cavity photon mode is expected to modify the Coulomb interaction of an electron system in the cavity.Here we investigate this phenomena in a parallel double quantum dot system. We explore properties of the closed system and the system after it has been opened up for electron transport. We show how results for both cases support the idea that the effective electron-electron interaction becomes more repulsive in the presence of a cavity photon field. This can be understood in terms of the cavity photons dressing the polarization terms in the effective mutual electron interaction leading to nontrivial delocalization or polarization of the charge in the double parallel dot potential. In addition, we find that the effective repulsion of the electrons can be reduced by quadrupolar collective oscillations excited by an external classical dipole electric field.

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“…As the terms in L can be cleanly traced back to the left or the right lead with no mixed terms we can, as before, 25,26 calculate the current from the left lead into the central system, I L , and the current from the central system into the right lead, I R , using the time-derivative of vec(ρ S (t)) in the equation of motion (13) and its solution (14). Accuracy in numerical calculations is essential and error can cumulate in different parts of a model evaluation.…”

Section: B Coupling To the Leads -Time Evolutionmentioning

confidence: 99%

“…Instead, we have to pay attention to the quality of the complex valued eigenvalues of the nonsymmetric Liouvillian L in Eq. (14). This is a nontrivial task and has been studied within the QuTiP python-framework.…”

Section: B Coupling To the Leads -Time Evolutionmentioning

confidence: 99%

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Time-dependent current into and through multilevel parallel quantum dots in a photon cavity

et al. 2017

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We analyze theoretically the charging current into, and the transport current through, a nanoscale two-dimensional electron system with two parallel quantum dots embedded in a short wire placed in a photon cavity. A plunger gate is used to place specific many-body states of the interacting system in the bias window defined by the external leads. We show how the transport phenomena active in the many-level complex central system strongly depend on the gate voltage. We identify a resonant transport through the central system as the two spin components of the one-electron ground state are in the bias window. This resonant transport through the lowest energy electron states seems to a large extent independent of the detuned photon field when judged from the transport current. This could be expected in the small bias regime, but an observation of the occupancy of the states of the system reveals that this picture is not entirely true. The current does not reflect slower photonactive internal transitions bringing the system into the steady state. The number of initially present photons determines when the system reaches the real steady state. With two-electron states in the bias window we observe a more complex situation with intermediate radiative and nonradiative relaxation channels leading to a steady state with a weak nonresonant current caused by inelastic tunneling through the two-electron ground state of the system. The presence of the radiative channels makes this phenomena dependent on the number of photons initially in the cavity.Various properties of nanoscale electron and spin systems in microwave cavities are presently the focus point of many researchers. Just to mention some; photon emission from a cavity-coupled double quantum dot caused by an electron transport through it has been reported, 1 and the manipulation of spin qubits in cavities has gained paramount interest. 2,3Investigations of transport of electrons through solidstate electronic systems placed in photon cavities are gaining attention. Partially, this is due to the obvious connection to efforts to achieve quantum computation in a solid-state system, and partially it is due to the interest to study fundamental light-matter interactions in a system expected to be highly tunable and offer increased sensitivity of measurements. In several cases the electronic systems have been single or multiple quantum dots created with InAs, 2 GaAs, 4,5 carbon nanotubes, 3 or graphene, 6 and very recently in SiGe heterostructures. 7Experiments have been reported on carbon nanotube quantum dots in a planar microwave cavity coupled to external fermionic or superconducting leads. The sensitivity of the measurements due to the cavity allows for the detection of a photon assisted current of 0.3 pA corresponding to the mean photon number in the cavity being 120,8,9 a current that is much lower than what is common in measurements of photon assisted tunneling through quantum dots when they are not placed in a cavity. 10Numerous models have been presented for transpo...

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Coupled Collective and Rabi Oscillations Triggered by Electron Transport through a Photon Cavity

Cited by 19 publications

References 24 publications

Backaction effects in cavity-coupled quantum conductors

Backaction effects in cavity-coupled quantum conductors

Cavity‐photon contribution to the effective interaction of electrons in parallel quantum dots

Time-dependent current into and through multilevel parallel quantum dots in a photon cavity

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