scholarly journals Zero-Bias Peaks in the Tunneling Conductance of Spin-Orbit-Coupled Superconducting Wires with and without Majorana End-States

2012 ◽  
Vol 109 (26) ◽  
Author(s):  
Jie Liu ◽  
Andrew C. Potter ◽  
K. T. Law ◽  
Patrick A. Lee
Keyword(s):  
Tunneling Conductance ◽  
Spin Orbit ◽  
Zero Bias ◽  
Superconducting Wires

scholarly journals Signature of a pair of Majorana zero modes in superconducting gold surface states

2020 ◽  
Vol 117 (16) ◽  
pp. 8775-8782 ◽  
Author(s):  
Sujit Manna ◽  
Peng Wei ◽  
Yingming Xie ◽  
Kam Tuen Law ◽  
Patrick A. Lee ◽  
...  
Keyword(s):  
Surface States ◽  
Gold Surface ◽  
Building Blocks ◽  
Energy Scale ◽  
Scanning Tunneling ◽  
Tunneling Conductance ◽  
Gold Nanowires ◽  
Noise Sources ◽  
Zero Bias ◽  
Zero Modes

Under certain conditions, a fermion in a superconductor can separate in space into two parts known as Majorana zero modes, which are immune to decoherence from local noise sources and are attractive building blocks for quantum computers. Promising experimental progress has been made to demonstrate Majorana zero modes in materials with strong spin–orbit coupling proximity coupled to superconductors. Here we report signatures of Majorana zero modes in a material platform utilizing the surface states of gold. Using scanning tunneling microscope to probe EuS islands grown on top of gold nanowires, we observe two well-separated zero-bias tunneling conductance peaks aligned along the direction of the applied magnetic field, as expected for a pair of Majorana zero modes. This platform has the advantage of having a robust energy scale and the possibility of realizing complex designs using lithographic methods.

Power Law Behavior of the Zero Bias Tunneling Conductance: the New Evidence for d -Wave Symmetry

2000 ◽  
Vol 17 (10) ◽  
pp. 760-761 ◽  
Author(s):  
Li Shao-Xiong ◽  
Tao Hong-Jie ◽  
Xuan Yi ◽  
Zhao Bai-Ru ◽  
Zhao Zhong-Xian
Keyword(s):  
Power Law ◽  
Tunneling Conductance ◽  
Zero Bias ◽  
Wave Symmetry ◽  
New Evidence ◽  
D Wave

TUNNELING IN A QUANTUM HALL EXCITONIC CONDENSATE

2002 ◽  
Vol 16 (20n22) ◽  
pp. 2923-2923 ◽  
Author(s):  
J. P. EISENSTEIN ◽  
I. B. SPIELMAN ◽  
L. N. PFEIFFER ◽  
K. W. WEST
Keyword(s):  
Ground State ◽  
Josephson Effect ◽  
Bose Condensate ◽  
Quantum Hall ◽  
Collective Modes ◽  
Tunneling Conductance ◽  
Electron Gases ◽  
Linear Dispersion ◽  
Zero Bias ◽  
Long Wavelength

Recent experiments on the tunneling conductance between parallel 2D electron gases at total Landau level filing ν tot = 1 are described. When the two layers are close enough together the ground state of the system may be viewed as a Bose condensate of excitons consisting of electrons in one layer paired with (conduction band) holes in the other. The measured tunneling conductance exhibits a spectacular resonance around zero bias which resembles the dc Josephson effect. This resonance is a signature of long wavelength Goldstone collective modes in the phase coherent ground state. Experiments performed with an added in-plane magnetic field have demonstrated the expected linear dispersion of this mode.

Nonlinear entangled quantum dynamics in many-body systems with strong electron correlation

2017 ◽  
Vol 31 (10) ◽  
pp. 1742009 ◽  
Author(s):  
Jongbae Hong
Keyword(s):  
Electron Correlation ◽  
Quantum Dynamics ◽  
Entangled State ◽  
Tunneling Conductance ◽  
Strong Electron Correlation ◽  
Strong Electron ◽  
Zero Bias ◽  
Highly Nonlinear ◽  
Quantum Impurity ◽  
Impurity System

A quantum impurity system out of equilibrium comprises two metallic reservoirs with different chemical potentials and one mediating spin impurity between them. We study the highly nonlinear tunneling conductance of this system, and clarify that three coherent peaks, one zero-bias peak and two side peaks, naturally appear in the tunneling conductance. We use the Liouvillian approach, in which a complete set of basis operators is available, and construct a Liouville matrix to obtain Green’s function at the mediating site. We show that the two coherent side peaks are the outcome of steady-state nonequilibrium combined with strong electron correlation at the mediating site. Tunneling in the quantum impurity system out of equilibrium is performed by an entangled state which is a linear combination of two Kondo singlets formed by the spin at the mediating site and the coherent spins in each reservoir. The fluctuation by incoherent spins is also included. The spectral weights and positions of the three coherent peaks are analytically discussed via atomic limit analysis. Our theoretical results well fit experimental data obtained for quantum point contacts with symmetric and asymmetric Kondo couplings.

scholarly journals A NOVEL MERON-INDUCED PSEUDOSPIN WAVE IN THE BILAYER QUANTUM HALL COHERENT STATE AND THE RESIDUAL ZERO-BIAS PEAK IN TUNNELING CONDUCTANCE

2003 ◽  
Vol 17 (26) ◽  
pp. 1377-1384
Author(s):  
YUE YU
Keyword(s):  
Coherent State ◽  
Bias Voltage ◽  
Rotational Symmetry ◽  
Quantum Hall ◽  
Tunneling Conductance ◽  
Zero Bias ◽  
Voltage Range ◽  
High Bias ◽  
Bilayer Quantum Hall ◽  
Periodic Domain Structure

In the bilayer quantum Hall coherent state for νT deviating slightly from unity, we show that, instead of the global order parameter, the periodic domain structure accompanying the charged meron pairs spontaneously breaks the pseudospin U(1) rotational symmetry. The motion of meron pairs induces a novel pseudospin wave. The long-range order of the periodic domains in a low bias voltage range leads to the residual zero-bias peak in the tunneling conductance, which can be distinct from the pseudopsin Goldstone feature in a high bias voltage range.

d-Wave Tunnel Junctions

1999 ◽  
Vol 13 (09n10) ◽  
pp. 1295-1299
Author(s):  
A. M. Cucolo ◽  
M. Cuoco ◽  
C. Noce
Keyword(s):  
Weak Coupling ◽  
Tunnel Junctions ◽  
Coupling Model ◽  
Normal Metal ◽  
Tunneling Conductance ◽  
Spin States ◽  
S Wave ◽  
Zero Bias ◽  
Zero Bias Conductance ◽  
D Wave

We study the tunneling spectra for superconductor-insulator-normal metal (S-I-N) tunnel junctions with an s -wave or a d -wave superconductor within the weak-coupling model. We deduce the temperature behavior of tunneling conductance and their peak positions as well as of the zero-bias conductance. The results obtained allow us to discriminate among the two singlet spin states.

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