Three-phase Majorana zero modes at tiny magnetic fields
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Three-phase Majorana zero modes at tiny magnetic fields. / Lesser, Omri; Flensberg, Karsten; von Oppen, Felix; Oreg, Yuval.
In: Physical Review B, Vol. 103, No. 12, 121116, 26.03.2021.Research output: Contribution to journal › Letter › Research › peer-review
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TY - JOUR
T1 - Three-phase Majorana zero modes at tiny magnetic fields
AU - Lesser, Omri
AU - Flensberg, Karsten
AU - von Oppen, Felix
AU - Oreg, Yuval
PY - 2021/3/26
Y1 - 2021/3/26
N2 - Proposals for realizing Majorana fermions in condensed-matter systems typically rely on magnetic fields, which degrade the proximitizing superconductor and plague theMajoranas' detection. We propose an alternative scheme to realize Majoranas based only on phase-biased superconductors. The phases (at least three of them) can be biased by a tiny magnetic field threading macroscopic superconducting loops, focusing and enhancing the effect of the magnetic field onto the junction, or by supercurrents. We show how a combination of the superconducting phase winding and the spin-orbit phase induced in closed loops (Aharonov-Casher effect) facilitates a topological superconducting state with Majorana end states. We demonstrate this scheme with an analytically tractable model as well as simulations of realistic setups comprising only conventional materials.
AB - Proposals for realizing Majorana fermions in condensed-matter systems typically rely on magnetic fields, which degrade the proximitizing superconductor and plague theMajoranas' detection. We propose an alternative scheme to realize Majoranas based only on phase-biased superconductors. The phases (at least three of them) can be biased by a tiny magnetic field threading macroscopic superconducting loops, focusing and enhancing the effect of the magnetic field onto the junction, or by supercurrents. We show how a combination of the superconducting phase winding and the spin-orbit phase induced in closed loops (Aharonov-Casher effect) facilitates a topological superconducting state with Majorana end states. We demonstrate this scheme with an analytically tractable model as well as simulations of realistic setups comprising only conventional materials.
KW - TOPOLOGICAL SUPERCONDUCTIVITY
KW - STATES
KW - PHASE
U2 - 10.1103/PhysRevB.103.L121116
DO - 10.1103/PhysRevB.103.L121116
M3 - Letter
VL - 103
JO - Physical Review B
JF - Physical Review B
SN - 2469-9950
IS - 12
M1 - 121116
ER -
ID: 269503556