TY  - JOUR
A1  - Manassen, Yishay
A1  - Jbara, Moamen
A1  - Averbukh, Michael
A1  - Hazan, Zion
A1  - Henkel, Carsten
A1  - Horovitz, Baruch
T1  - Tunnel current noise spectra of spins in individual dimers of molecular radicals
JF  - Physical review : B, Condensed matter and materials physics
N2  - We report the detection of electron spin resonance (ESR) in individual dimers of the stable free radical 2,2,6,6tetramethyl-piperidine-1-oxyl (TEMPO). ESR is measured by the current fluctuations in a scanning tunneling microscope (ESR-STM method). The multipeak power spectra, distinct from macroscopic data, are assigned to dimers having exchange and Dzyaloshinskii-Moriya interactions in the presence of spin-orbit coupling. These interactions are generated in our model by interfering electronic tunneling pathways from tip to sample via the dimer???s two molecules. This is the first demonstration that tunneling via two spins is a valid mechanism of the ESR-STM method.
Y1  - 2022
U6  - https://doi.org/10.1103/PhysRevB.105.235438
SN  - 2469-9950
SN  - 2469-9969
VL  - 105
IS  - 23
PB  - American Physical Society
CY  - College Park
ER  - 
TY  - JOUR
A1  - Horovitz, Baruch
A1  - Henkel, Carsten
T1  - Spin entanglement via scanning tunneling microscope current
JF  - Physical review : B, Condensed matter and materials physics
N2  - We consider a system of two spins under a scanning tunneling microscope bias and derive its master equation. We find that the tunneling elements to the electronic contacts (tip and substrate) generate an exchange interaction between the spins as well as a Dzyaloshinskii-Moriya interaction in the presence of spin-orbit coupling. The tunnel current spectrum then shows additional lines compared to conventional spin-resonance experiments. When the spins have degenerate Larmor frequencies and equal tunneling amplitudes (without spin orbit), there is a dark state with a vanishing decay rate. The coupling to the electronic environment generates significant spin-spin entanglement via the dark state, even if the initial state is nonentangled.
Y1  - 2021
U6  - https://doi.org/10.1103/PhysRevB.104.L081405
SN  - 2469-9950
SN  - 2469-9969
VL  - 104
IS  - 8
PB  - American Physical Society
CY  - Ridge, NY
ER  - 
TY  - JOUR
A1  - Horovitz, Baruch
A1  - Henkel, Carsten
T1  - Surface plasmons at composite surfaces with diffusive charges
JF  - epl : a letters journal exploring the frontiers of physics
N2  - Metal surfaces with disorder or with nanostructure modifications are studied, allowing for a localized charge layer (CL) in addition to continuous charges (CC) in the bulk, both charges having a compressional or diffusive nonlocal response. The notorious problem of "additional boundary conditions" is resolved with the help of a Boltzmann equation that involves the scattering between the two charge types. Depending on the strength of this scattering, the oscillating charges can be dominantly CC or CL; the surface plasmon (SP) resonance acquires then a relatively small linewidth, in agreement with a large set of data. With a few parameters our model describes a large variety of SP dispersions corresponding to observed data.
Y1  - 2012
U6  - https://doi.org/10.1209/0295-5075/97/57010
SN  - 0295-5075
VL  - 97
IS  - 5
PB  - EDP Sciences
CY  - Mulhouse
ER  - 
TY  - JOUR
A1  - Eizner, E.
A1  - Horovitz, Baruch
A1  - Henkel, Carsten
T1  - Van der waals-casimir-polder interaction of an atom with a composite surface
JF  - The European physical journal : D, Atomic, molecular, optical and plasma physics
N2  - We study the dispersion interaction of the van der Waals and Casimir-Polder (vdW-CP) type between a neutral atom and the surface of a conductor by allowing for nonlocal electrodynamics, i.e. electron diffusion. We consider two models: (i) bulk diffusion, and (ii) diffusion in a surface charge layer. In both cases, we find that the transition to a semiconductor as a function of the conductivity is continuous, unlike the case of a local model. The relevant parameter is the electric screening length and depends on the carrier diffusion constant. We find that for distances comparable to the screening length, vdW-CP data can distinguish between bulk and surface diffusion, hence it can be a sensitive probe for surface states.
Y1  - 2012
U6  - https://doi.org/10.1140/epjd/e2012-30294-x
SN  - 1434-6060
VL  - 66
IS  - 12
PB  - Springer
CY  - New York
ER  -