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Realization of a degenerate parametric oscillator in electromechanical systems

Jansen, E. (author), Pereira Machado, J.D. (author), Blanter, Y.M. (author)

We consider an electromechanical system in which a microwave cavity is coupled to a mechanical resonator, with a mechanical frequency twice the microwave frequency. In this regime, the effective photon-phonon interaction is equivalent to that of a degenerate parametric amplifier, instead of the typical radiation pressure interaction. If the...

journal article 2019

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Crossover between strong and weak measurement in interacting many-body systems

Esin, I. (author), Romito, A. (author), Blanter, I.M. (author), Gefen, Y. (author)

Measurements with variable system–detector interaction strength, ranging from weak to strong, have been recently reported in a number of electronic nanosystems. In several such instances many-body effects play a significant role. Here we consider the weak-to-strong crossover for a setup consisting of an electronic Mach–Zehnder interferometer,...

journal article 2016

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Large cooperativity and microkelvin cooling with a three-dimensional optomechanical cavity

Yuan, M. (author), Singh, V. (author), Blanter, I.M. (author), Steele, G.A. (author)

In cavity optomechanics, light is used to control mechanical motion. A central goal of the field is achieving single-photon strong coupling, which would enable the creation of quantum superposition states of motion. Reaching this limit requires significant improvements in optomechanical coupling and cavity coherence. Here we introduce an...

journal article 2015

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Optomechanical response of a nonlinear mechanical resonator

Shevchuk, O. (author), Singh, V. (author), Steele, G.A. (author), Blanter, Y.M. (author)

We investigate theoretically in detail the nonlinear effects in the response of an optical/microwave cavity coupled to a Duffing mechanical resonator. The cavity is driven by a laser at a red or blue mechanical subband, and a probe laser measures the reflection close to the cavity resonance. Under these conditions, we find that the cavity...

journal article 2015

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Computable negativity in two-mode squeezing subject to dissipation

Dukalski, M. (author), Blanter, Y.M. (author)

We study a system of two bosonic fields subject to two-mode squeezing in the presence of dissipation. We find the Lie algebra governing the dynamics of the problem and use the Wei-Norman method to determine the solutions. Using this scheme, we arrive at a closed-form expression for an infinitely dimensional density operator which we use to...

journal article 2015

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Light-induced spin polarizations in quantum rings

Joibari, F.K. (author), Blanter, Y.M. (author), Bauer, G.E.W. (author)

Nonresonant circularly polarized electromagnetic radiation can exert torques on magnetizations by the inverse Faraday effect (IFE). Here, we discuss the enhancement of IFE by spin-orbit interactions. We illustrate the principle by studying a simple generic model system, i.e., the quasi-one-dimensional ring in the presence of linear/cubic Rashba...

journal article 2014

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Eigenfrequencies of the randomly pinned drum and conductivity of graphene

Medvedyeva, M.V. (author), Blanter, Y.M. (author)

Graphene is a convenient material for nanomechanical applications since high-frequency oscillations are easily accessible. In this article, we consider graphene on a rough substrate attached to imperfections at random locations. We explore the statistics of low-lying phonon modes, which exert most influence on the conductivity of graphene. Our...

journal article 2013

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Aharonov-Casher effect in quantum ring ensembles

Joibari, F.K. (author), Blanter, Y.M. (author), Bauer, G.E.W. (author)

We study the transport of electrons through a single-mode quantum ring with electric-field induced Rashba spin-orbit interaction that is subject to an in-plane magnetic field and weakly coupled to electron reservoirs. Modeling a ring array by ensemble averaging over a Gaussian distribution of energy-level positions, we predict slow conductance...

journal article 2013

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Probing the charge of a quantum dot with a nanomechanical resonator

Meerwaldt, H.B. (author), Labadze, G. (author), Schneider, B.H. (author), Taspinar, A. (author), Blanter, Y.M. (author), Van der Zant, H.S.J. (author), Steele, G.A. (author)

We have used the mechanical motion of a carbon nanotube (CNT) as a probe of the average charge on a quantum dot. Variations of the resonance frequency and the quality factor are determined by the change in average charge on the quantum dot during a mechanical oscillation. The average charge, in turn, is influenced by the gate voltage, the bias...

journal article 2012

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Nonlinear dynamics in a magnetic Josephson junction

Hoffman, S. (author), Blanter, Y.M. (author), Tserkovnyak, Y. (author)

We theoretically consider a Josephson junction formed by a ferromagnetic spacer with a strong spin-orbit interaction or a magnetic spin valve, i.e., a bilayer with one static and one free layer. Electron spin transport facilitates a nonlinear dynamical coupling between the magnetic moment and charge current, which consists of normal and...

journal article 2012

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Interplay between real and pseudomagnetic field in graphene with strain

Kim, K.J. (author), Blanter, Y.M. (author), Ahn, K.H. (author)

We investigate electric and magnetic properties of graphene with rotationally symmetric strain. The strain generates a large pseudomagnetic field with alternating sign in space, which forms a strongly confined quantum dot connected to six chiral channels. The orbital magnetism, degeneracy, and channel opening can be understood from the interplay...

journal article 2011

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Detecting phonon blockade with photons

Didier, N. (author), Pugnetti, S. (author), Blanter, Y.M. (author), Fazio, R. (author)

Measuring the quantum dynamics of a mechanical system, when few phonons are involved, remains a challenge. We show that a superconducting microwave resonator linearly coupled to the mechanical mode constitutes a very powerful probe for this scope. This new coupling can be much stronger than the usual radiation pressure interaction by adjusting a...

journal article 2011

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Piezoconductivity of gated suspended graphene

Medvedyeva, M.V. (author), Blanter, Y.M. (author)

We investigate the conductivity of graphene sheet deformed over a gate. The effect of the deformation on the conductivity is twofold: The lattice distortion can be represented as pseudovector potential in the Dirac equation formalism, whereas the gate causes inhomogeneous density redistribution. We use the elasticity theory to find the profile...

journal article 2011

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Quantum dynamics of a driven three-level Josephson-atom maser

Didier, N. (author), Blanter, Y.M. (author), Hekking, F.W.J. (author)

Recently, a lasing effect has been observed in a superconducting nanocircuit where a Cooper-pair box, acting as an artificial three-level atom, was coupled to a resonator [O. Astafiev, K. Inomata, A. O. Niskanen, T. Yamamoto, Yu. A. Pashkin, Y. Nakamura, and J. S. Tsai, Nature (London) 449, 588 (2007)]. Motivated by this experiment, we analyze...

journal article 2010

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Periodic revival of entanglement of two strongly driven qubits in a dissipative cavity

Dukalski, M. (author), Blanter, Y.M. (author)

We present a phenomenon of an asymptotic revival of bipartite entanglement between two stable solid-state qubits interacting via a single-mode cavity subject to dissipation. This effect is achievable in cavity quantum electrodynamics systems, assisted with strong classical pumping detuned from the cavity eigenmode, under the assumption of short...

journal article 2010

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Tunable Backaction of a DC SQUID on an Integrated Micromechanical Resonator

Poot, M. (author), Etaki, S. (author), Mahboob, I. (author), Onomitsu, K. (author), Yamaguchi, H. (author), Blanter, Y.M. (author), Van der Zant, H.S.J. (author)

We have measured the backaction of a dc superconducting quantum interference device (SQUID) position detector on an integrated 1 MHz flexural resonator. The frequency and quality factor of the micromechanical resonator can be tuned with bias current and applied magnetic flux. The backaction is caused by the Lorentz force due to the change in...

journal article 2010

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Resonant coupling of a SQUID to a mechanical resonator

Pugnetti, S. (author), Blanter, Y.M. (author), Fazio, R. (author)

We analyze the properties of a mechanical resonator embedded into a quantum SQUID and analyze under which conditions it is possible to realize a resonant coupling between the SQUID and the resonator. We find, within the present technology, how it is possible to tune the system into the regime where the plasma frequency of the SQUID matches the...

journal article 2010

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Transport in disordered graphene nanoribbons

Martin, I. (author), Blanter, Y.M. (author)

We study electronic transport in graphene nanoribbons with rough edges. We first consider a model of weak disorder that corresponds to an armchair ribbon whose width randomly changes by a single unit cell size. We find that in this case, the low-temperature conductivity is governed by an effective one-dimensional hopping between segments of...

journal article 2009

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Dynamics of a SQUID ratchet coupled to a nanomechanical resonator

Pugnetti, S. (author), Blanter, Y.M. (author), Dolcini, F. (author), Fazio, R. (author)

We investigate the dynamics of a superconducting rectifying circuit, namely, a three-junction superconducting quantum interference device (SQUID), where one arm of the superconducting loop consists of a nanomechanical resonator. We find that the dc characteristic curve of the system displays features that are directly related to the frequency...

journal article 2009

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Mechanical feedback in the high-frequency limit

El Boubsi, R. (author), Usmani, O. (author), Blanter, Ya.M. (author)

journal article 2008