BCS theory for neutral fermions
As I understand it, Cooper pairs form between two fermions and are the cause of superconductivity. I was told by a teacher that the formation of Cooper pairs and BCS theory requires both fermions to be charged. But I also understand that Cooper pairs can form between two neutrons in neutron stars and neutrons are neutral particles. I asked the teacher the same question and they told me that it was because of pairing between the quark constituents of the neutron.
However, I have not been able to find any article or text that refers to this. In reading about BCS theory I have also not found any discussion on the fermions needing to be charged. Could someone refer me to any such text? Or help me understand what I am missing. I am new to the subject and asking questions as a novice.
The context of the discussion was that the teacher was saying that neutron star superconductivity and superfluidity required QED to be described. And I could not understand how QED could be applied to neutrons.
superconductivity fermions neutron-stars superfluidity
asked 7 hours ago
sasaak
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As I understand it, Cooper pairs form between two fermions and are the cause of superconductivity. I was told by a teacher that the formation of Cooper pairs and BCS theory requires both fermions to be charged. But I also understand that Cooper pairs can form between two neutrons in neutron stars and neutrons are neutral particles. I asked the teacher the same question and they told me that it was because of pairing between the quark constituents of the neutron.
However, I have not been able to find any article or text that refers to this. In reading about BCS theory I have also not found any discussion on the fermions needing to be charged. Could someone refer me to any such text? Or help me understand what I am missing. I am new to the subject and asking questions as a novice.
The context of the discussion was that the teacher was saying that neutron star superconductivity and superfluidity required QED to be described. And I could not understand how QED could be applied to neutrons.
superconductivity fermions neutron-stars superfluidity
asked 7 hours ago
sasaak
164
New contributor
sasaak is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Related: physics.stackexchange.com/questions/11064/…
– Mitchell Porter
3 hours ago
add a comment |
As I understand it, Cooper pairs form between two fermions and are the cause of superconductivity. I was told by a teacher that the formation of Cooper pairs and BCS theory requires both fermions to be charged. But I also understand that Cooper pairs can form between two neutrons in neutron stars and neutrons are neutral particles. I asked the teacher the same question and they told me that it was because of pairing between the quark constituents of the neutron.
However, I have not been able to find any article or text that refers to this. In reading about BCS theory I have also not found any discussion on the fermions needing to be charged. Could someone refer me to any such text? Or help me understand what I am missing. I am new to the subject and asking questions as a novice.
The context of the discussion was that the teacher was saying that neutron star superconductivity and superfluidity required QED to be described. And I could not understand how QED could be applied to neutrons.
superconductivity fermions neutron-stars superfluidity
asked 7 hours ago
sasaak
164
New contributor
sasaak is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
As I understand it, Cooper pairs form between two fermions and are the cause of superconductivity. I was told by a teacher that the formation of Cooper pairs and BCS theory requires both fermions to be charged. But I also understand that Cooper pairs can form between two neutrons in neutron stars and neutrons are neutral particles. I asked the teacher the same question and they told me that it was because of pairing between the quark constituents of the neutron.
However, I have not been able to find any article or text that refers to this. In reading about BCS theory I have also not found any discussion on the fermions needing to be charged. Could someone refer me to any such text? Or help me understand what I am missing. I am new to the subject and asking questions as a novice.
The context of the discussion was that the teacher was saying that neutron star superconductivity and superfluidity required QED to be described. And I could not understand how QED could be applied to neutrons.
superconductivity fermions neutron-stars superfluidity
superconductivity fermions neutron-stars superfluidity
asked 7 hours ago
sasaak
164
New contributor
sasaak is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 7 hours ago
sasaak
164
New contributor
sasaak is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 7 hours ago
asked 7 hours ago
sasaak
164
New contributor
sasaak is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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asked 7 hours ago
sasaak
164
asked 7 hours ago
sasaak
164
164
New contributor
sasaak is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
sasaak is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
sasaak is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Related: physics.stackexchange.com/questions/11064/…
– Mitchell Porter
3 hours ago
add a comment |
Related: physics.stackexchange.com/questions/11064/…
– Mitchell Porter
3 hours ago
Related: physics.stackexchange.com/questions/11064/…
– Mitchell Porter
3 hours ago
Related: physics.stackexchange.com/questions/11064/…
– Mitchell Porter
3 hours ago
add a comment |
1 Answer
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Neutral $^3$He atoms also pair to form a BCS-like superfluid. There has to be some source of an attractive force to cause the pairing, and in this case attractive pairing force comes from correlated fluctuations of the atoms' nuclear magnetic moments. I suppose that you can say that there is some electric charge causing the magnetic moments. In neutron stars, though, the pairing presumabley comes from the strong-force interactions -- so pairing does not always require an electromagnetic charge.
answered 6 hours ago
mike stone
6,3121222
Thank you very much. When you say that the pairing is presumably due to strong-force interaction, does this mean that we do not know for certain if the neutron-neutron pairing in neutron stars is due to the strong force or some other force (electromagnetic force between the quarks forming the neutron as the prof. said)? I have read that Bogoliubov extended BCS theory to nuclear matter. Does his theory involve strong force interactions? I have looked at descriptions of his work but do not have the background to be able to understand if it involved strong force interactions or not.
– sasaak
5 hours ago
add a comment |
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Neutral $^3$He atoms also pair to form a BCS-like superfluid. There has to be some source of an attractive force to cause the pairing, and in this case attractive pairing force comes from correlated fluctuations of the atoms' nuclear magnetic moments. I suppose that you can say that there is some electric charge causing the magnetic moments. In neutron stars, though, the pairing presumabley comes from the strong-force interactions -- so pairing does not always require an electromagnetic charge.
answered 6 hours ago
mike stone
6,3121222
Thank you very much. When you say that the pairing is presumably due to strong-force interaction, does this mean that we do not know for certain if the neutron-neutron pairing in neutron stars is due to the strong force or some other force (electromagnetic force between the quarks forming the neutron as the prof. said)? I have read that Bogoliubov extended BCS theory to nuclear matter. Does his theory involve strong force interactions? I have looked at descriptions of his work but do not have the background to be able to understand if it involved strong force interactions or not.
– sasaak
5 hours ago
add a comment |
Neutral $^3$He atoms also pair to form a BCS-like superfluid. There has to be some source of an attractive force to cause the pairing, and in this case attractive pairing force comes from correlated fluctuations of the atoms' nuclear magnetic moments. I suppose that you can say that there is some electric charge causing the magnetic moments. In neutron stars, though, the pairing presumabley comes from the strong-force interactions -- so pairing does not always require an electromagnetic charge.
answered 6 hours ago
mike stone
6,3121222
Thank you very much. When you say that the pairing is presumably due to strong-force interaction, does this mean that we do not know for certain if the neutron-neutron pairing in neutron stars is due to the strong force or some other force (electromagnetic force between the quarks forming the neutron as the prof. said)? I have read that Bogoliubov extended BCS theory to nuclear matter. Does his theory involve strong force interactions? I have looked at descriptions of his work but do not have the background to be able to understand if it involved strong force interactions or not.
– sasaak
5 hours ago
add a comment |
Neutral $^3$He atoms also pair to form a BCS-like superfluid. There has to be some source of an attractive force to cause the pairing, and in this case attractive pairing force comes from correlated fluctuations of the atoms' nuclear magnetic moments. I suppose that you can say that there is some electric charge causing the magnetic moments. In neutron stars, though, the pairing presumabley comes from the strong-force interactions -- so pairing does not always require an electromagnetic charge.
answered 6 hours ago
mike stone
6,3121222
Neutral $^3$He atoms also pair to form a BCS-like superfluid. There has to be some source of an attractive force to cause the pairing, and in this case attractive pairing force comes from correlated fluctuations of the atoms' nuclear magnetic moments. I suppose that you can say that there is some electric charge causing the magnetic moments. In neutron stars, though, the pairing presumabley comes from the strong-force interactions -- so pairing does not always require an electromagnetic charge.
answered 6 hours ago
mike stone
6,3121222
answered 6 hours ago
mike stone
6,3121222
answered 6 hours ago
mike stone
6,3121222
answered 6 hours ago
mike stone
6,3121222
6,3121222
Thank you very much. When you say that the pairing is presumably due to strong-force interaction, does this mean that we do not know for certain if the neutron-neutron pairing in neutron stars is due to the strong force or some other force (electromagnetic force between the quarks forming the neutron as the prof. said)? I have read that Bogoliubov extended BCS theory to nuclear matter. Does his theory involve strong force interactions? I have looked at descriptions of his work but do not have the background to be able to understand if it involved strong force interactions or not.
– sasaak
5 hours ago
add a comment |
Thank you very much. When you say that the pairing is presumably due to strong-force interaction, does this mean that we do not know for certain if the neutron-neutron pairing in neutron stars is due to the strong force or some other force (electromagnetic force between the quarks forming the neutron as the prof. said)? I have read that Bogoliubov extended BCS theory to nuclear matter. Does his theory involve strong force interactions? I have looked at descriptions of his work but do not have the background to be able to understand if it involved strong force interactions or not.
– sasaak
5 hours ago
Thank you very much. When you say that the pairing is presumably due to strong-force interaction, does this mean that we do not know for certain if the neutron-neutron pairing in neutron stars is due to the strong force or some other force (electromagnetic force between the quarks forming the neutron as the prof. said)? I have read that Bogoliubov extended BCS theory to nuclear matter. Does his theory involve strong force interactions? I have looked at descriptions of his work but do not have the background to be able to understand if it involved strong force interactions or not.
– sasaak
5 hours ago
Thank you very much. When you say that the pairing is presumably due to strong-force interaction, does this mean that we do not know for certain if the neutron-neutron pairing in neutron stars is due to the strong force or some other force (electromagnetic force between the quarks forming the neutron as the prof. said)? I have read that Bogoliubov extended BCS theory to nuclear matter. Does his theory involve strong force interactions? I have looked at descriptions of his work but do not have the background to be able to understand if it involved strong force interactions or not.
– sasaak
5 hours ago
add a comment |
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Related: physics.stackexchange.com/questions/11064/…
– Mitchell Porter
3 hours ago