675 citations · 5.6k across the 111 of their papers we have counts for
72 papers · 1 filter
Nonequilibrium effects in spin-torque oscillators
Pieter M. Gunnink, Tim Ludwig, Alexander Shnirman +1
One of the cornerstones of spintronics is the application of a spin-transfer torque to a nanomagnet, driving the magnetization of the nanomagnet into a steady-state precession and…
Magnetization Dynamics and Peierls Instability in Topological Josephson Structures
Adrian Reich, Erez Berg, Jörg Schmalian +1
We study a long topological Josephson junction with a ferromagnetic strip between two superconductors. The low-energy theory exhibits a non-local in time and space interaction betw…
Coulomb blockade of chiral Majorana and complex fermions far from equilibrium
Dmitriy S. Shapiro, Alexander D. Mirlin, Alexander Shnirman
We study charge transport in a single-electron transistor implemented as an interferometer such that the Coulomb blockaded middle island contains a circular chiral Majorana or Dira…
Microwave response of a chiral Majorana interferometer
Dmitriy S. Shapiro, Alexander D. Mirlin, Alexander Shnirman
We consider an interferometer based on artificially induced topological superconductivity and chiral 1D Majorana fermions. The (non-topological) superconducting island inducing the…
Mesoscopic Stoner instability in open quantum dots: suppression of Coleman-Weinberg mechanism by electron tunneling
I. S. Burmistrov, Y. Gefen, D. S. Shapiro +1
The mesoscopic Stoner instability is an intriguing manifestation of symmetry breaking in isolated metallic quantum dots, underlined by the competition between single-particle energ…
Current noise geometrically generated by a driven magnet
Tim Ludwig, Igor S. Burmistrov, Yuval Gefen +1
We consider a non-equilibrium cross-response phenomenon, whereby a driven magnetization gives rise to electric shot noise (but no d.c. current). This effect is realized on a nano-s…
A thermally driven spin-transfer-torque system far from equilibrium: enhancement of the thermoelectric current via pumping current
Tim Ludwig, Igor S. Burmistrov, Yuval Gefen +1
We consider a small itinerant ferromagnet exposed to an external magnetic field and strongly driven by a thermally induced spin current. For this model, we derive the quasi-classic…
Fingerprints of single nuclear spin energy levels using STM - ENDOR
Yishay Manassen, Michael Averbukh, Bernhard Siebenhofer +2
We performed STM-ENDOR experiments where the intensity of one of the hyperfine components detected in ESR-STM is recorded while an rf power is irradiated into the tunneling junctio…
Emulating Majorana fermions and their braiding by Ising spin chains
Stefan Backens, Alexander Shnirman, Yuriy Makhlin +3
We analyse the control of Majorana zero-energy states by mapping the fermionic system onto a chain of Ising spins. Although the topological protection is lost for the Ising system,…
Thermoelectric transport in junctions of Majorana and Dirac channels
Dmitriy S. Shapiro, D. E. Feldman, Alexander D. Mirlin +1
We investigate the thermoelectric current and heat conductance in a chiral Josephson contact on a surface of a 3D topological insulator, covered with superconducting and magnetic i…
Strong non-equilibrium effects in spin torque systems
Tim Ludwig, Igor S. Burmistrov, Yuval Gefen +1
We consider a problem of persistent magnetization precession in a single domain ferromagnetic nano particle under the driving by the spin-transfer torque. We find that the adjustme…
Analysis of the conditional average and conditional variance of dissipated energy in the driven spin-boson model
Philip Wollfarth, Yasuhiro Utsumi, Alexander Shnirman
We investigate the conditional average and the conditional variance of dissipated energy considering, as a prototypical example, a driven spin-boson system. We follow a measurement…
Using Majorana spin-1/2 representation for the spin-boson model
Pablo Schad, Alexander Shnirman, Yuriy Makhlin
The Majorana representation for spin operators enables efficient application of field-theoretical methods for the analysis of spin dynamics. Moreover, a wide class of spin correlat…
U(1) and SU(2) quantum dissipative systems: The Caldeira-Leggett vs. the Amegaokar-Eckern-Schön approaches
Alexander Shnirman, Arijit Saha, Igor S. Burmistrov +3
There are two paradigmatic frameworks for treating quantum systems coupled to a dissipative environment: the Caldeira-Leggett and the Ambegaokar-Eckern-Schön approaches. Here we re…
Majorana representation for dissipative spin systems
P. Schad, Yu. Makhlin, B. N. Narozhny +2
The Majorana representation of spin operators allows for efficient field-theoretical description of spin-spin correlation functions. Any N-point spin correlation function is equiva…
Interacting two-level defects as sources of fluctuating high-frequency noise in superconducting circuits
Clemens Müller, Jürgen Lisenfeld, Alexander Shnirman +1
Since the very first experiments, superconducting circuits have suffered from strong coupling to environmental noise, destroying quantum coherence and degrading performance. In sta…
Geometric Quantum Noise of Spin
Alexander Shnirman, Yuval Gefen, Arijit Saha +3
The presence of geometric phases is known to affect the dynamics of the systems involved. Here we consider a quantum degree of freedom, moving in a dissipative environment, whose d…
Nonequilibrium Spin Noise and Noise of Susceptibility
Pablo Schad, Boris N. Narozhny, Gerd Schön +1
We analyze out-of-equilibrium fluctuations in a driven spin system and relate them to the noise of spin susceptibility. In the spirit of the linear response theory we further relat…
Distribution of energy dissipated by a driven two-level system
Philip Wollfarth, Alexander Shnirman, Yasuhiro Utsumi
In the context of fluctuation relations, we study the distribution of energy dissipated by a driven two-level system. Incorporating an energy counting field into the well known spi…
One-dimensional Josephson junction arrays: Lifting the Coulomb blockade by depinning
Nicolas Vogt, Roland Schäfer, Hannes Rotzinger +4
Experiments with one-dimensional arrays of Josephson junctions in the regime of dominating charging energy show that the Coulomb blockade is lifted at the threshold voltage, which…
Statistics of energy dissipation in a quantum dot operating in the cotunneling regime
Yehuda Dinaii, Alexander Shnirman, Yuval Gefen
At Coulomb blockade valleys inelastic cotunneling processes generate particle-hole excitations in quantum dots (QDs), and lead to energy dissipation. We have analyzed the probabili…
Flux noise in 2D Heisenberg spin glasses: effects of weak anisotropic interactions
Juan Atalaya, John Clarke, Gerd Schön +1
We study the dynamics of a two-dimensional ensemble of randomly distributed classical Heisenberg spins with isotropic RKKY and weaker anisotropic dipole-dipole couplings. Such ense…
Non-adiabatic processes in Majorana qubit systems
Mathias S. Scheurer, Alexander Shnirman
We investigate the non-adiabatic processes occurring during the manipulations of Majorana qubits in 1-D semiconducting wires with proximity induced superconductivity. Majorana qubi…
Full counting statistics applied to dissipative Cooper pair pumping
P. Wollfarth, I. Kamleitner, A. Shnirman
We calculate the charge transport in a flux biased dissipative Cooper pair pump using the method of full counting statistics (FCS). This is instead of a more traditional technique…